305 rough idle. (The idle air … Common Causes of 5.
- 305 rough idle If I start with timing advance bypass wire (black/tan) disconnected it starts and idles fine. In gear, it idles like it has a miss still. Idles fine for about 10-15 seconds, and then for about 5 seconds it gets rough, and I can feel vibration in the brake pedal, as well as hear the idle. John. got another vacuum advance on order that is slightly below It had the rough idle in drive problem that seems to be common but I couldn’t find any definitive solution. Here is the kicker if I go above speeds of 58 what happens is when I come to slow down to a stop my car will start idling real rough and will almost stall out. 007 over and a miracle occurred. Also, once it hits 4th gear, it drives fine at any rpm. Replaced map sensor. Just got it back on the road (major rod knock when we bought it). RussMasterTech. Unplug the MAP Sensor and the problem goes away, I replaced the MAP By chatting and providing personal I'm working on a 1988 chevy c1500 with a 305 tbi engine. What an Engine Needs to Why Is There A Rough Idle After Spark Plug Change? Rough idling can be caused by various issues. See if that evens it out. It ran really rough and backfired out the carb. Ran on the highway for 20 minutes and still have a very rough idle. Only Another Envoy with the dreaded rough idle. It will go from about 14 on the volt meter down to about 9, but not Rough Idle 1989 Camaro w/305 tbi Archived post. Faulty throttle position sensors, idle air control valves, and heat soak from warm fuel and ethanol content are common causes. 1 Customer: I have an 89 firebird with 305 tpi. Rough idle only during engine warm up cycle. Feels like an old vehicle with carburation and vaccuum distributor when a cyclinder is not firing. Also check that crankcase oil is not overfilled as a rough idle can result. The dealers solution clean valve cover due to blow by replace #1 plug as it was fouled. It runs great between 1000 and 5000 though. no CELS. I bought some of that slick 50 for older engines, and used it. I have a 305 sbc, RPM air Gap manifold, 750 cfm carburator, hedman headers, stock stall converter, and stock 2. Idles great and runs great when warmed up. 200-4R Identification and Specs; All About the 4L70E; 8L90E Specs, Performance, and Identification; 6L80E Specs + Identification; TH400 Transmission Specs, ID, and Common Problems; The most common symptoms of a bad idle control valve are rough idle and a check engine light on your dashboard. Joined: May 2017. As I said I'd like a rough, noticable or choppy idle, and get some more torque out of the motor. com, gmfullsize. It may lead to a miscalculation or an increase in the idling speed. The vehicle had a rough idle when stopped and in drive, such as being stopped at a stop sign or red light. It had an edelbrock 1406 carb, but the electric choke didn't work, the idle screws didn't do anything. 0 Laser Blue Pearl stock / 98 Neon Sport Coupe DOHC Alpine Green ATX stock / 95 NYG ACR Coupe (restored) / 18 Here is my issue. While the fundamental causes of rough idling remain similar, modern vehicles introduce additional complexities. Reactions: jpr1968. 5 Star Tuned/X4. Still throwing the check engine light with same cylinder misfires coded. 2) Will do, thanks. Should idle at 650 revs. It could also be an ignition mis-fire caused by fouled or improperly gapped plug(s), or a bad spark plug wire, or corroded terminals on your cap and/or rotor, or a crossfire where a spark plug wire is touching metal or another wire. WRONG!!!!! Rough Idle. While the idle speed 85 trans am 305 mpfi rough idle at start hello hope youve got the answer replaced plug+wires cap rotor tps. I ended up finding a hole in the fuel regulator. Very gassy exhaust when idling. It does have the HD trailer package which I understand to mean it has some extra Upon stopping I get a rough idle, almost a shudder, for a little bit and then it goes away. Other causes of a rough idling engine include the following: Faulty fuel pump; Faulty EGR valve; Bad PCV valve; Carburetor issues; Vacuum leak; How to Fix Rough Idle. General Discussion . Problem is not repeatable, but occurs randomly. I have always had this problem since I've bought it 5 years ago. This means that the fuel-air mixture in that particular cylinder is not igniting properly, leading to a loss of power, rough idling, and potentially increased emissions. You should also make sure you use a balancer for a 305 - otherwise you will have a lot of trouble getting the base timing right. ChBBZ · Registered. You may also notice fluctuating idle speed or a stalling engine on idle when your IAC valve is bad. If your Monte Carlo’s check engine light is on, there will be codes stored that can help you determine what part of your car’s engine is having problems. -Case 16 Dart SXT 2. it seems to do it when the truck comes to a stop and the breaks are applied. EricTheCarGuy. BULL116. Adjust the idle mixture on the carb at 700 and it should be fine. Those are rubber, get brittle, and fall off, causing an air leak. The car now idles again, however it's only smooth in neutral. Other Got a 305 with a few mild mods (headers, carb, intake ignition) that has been running weird lately. After a day driving with the stuff in, the engine was noticeably more perky, sounded stronger and also idled like it should! That stuff is great! Seemed to help but still is running very rough, idle is barely keeping it running, when I road test it, it coughs and sputters through the whole power band and I can smell a strong fuel smell. Joined: Feb 2010. On a 305 I imagine it would have more. If you’ve recently experienced your car starting to shake or bounce when idling, it’s best to diagnose the issues sooner rather than later. 7K views 15 replies 4 participants last post by LT1Steve May 19, 2000. Just a pronounced misfire at about 500 rpm. On a 350, it has just a touch of lope at idle. 1) On every start, the engine runs terribly for 5 seconds. User Info. The car has had a rough life and we bought it as his school car. then, after idling for a few seconds it died. A few months ago my Yukon started running very rich. she'd shut down, restart and it would run fine. At 2000 or 3000rpms it's steady at 60psi. 5" level lift, Grenade XD wheels, 305/55/20 Nitto Terra Grapplers. Symptoms of rough idling include: Uneven engine operation at idle; Fluctuating RPMs Hi Guys, got a 86 SS Monte Carlo 305 and the car idles fine or decent when in park, but when you put it in drive it gets a really rough idle, and when you step on the gas it hesitates and slowly goes barely without dying, when the rpm passes 1 then it takes off. It seems to stutter just off the line and around the 45-55 MPH range the worst. Fuel mileage is terrible still and exhaust is still rich. The truck runs rough at idle, though smoothes out as the rpm's rise. You can also hit the top of the carb with carb Rough running, hesitation, and/or jerking when accelerating; In most cases, there are no adverse conditions noticed by the driver; A Compression Test and an engine idle Manifold Vacuum Test are two very important methods of determining the mechanical condition of the engine. 5" Leveling Kit | 1" Rear Block | Access Vanish The causes of a rough idle range from minor issues to more significant mechanical problems. Previously it would cut off on me at stop lights or other times I was hitting the gas. When stopped at lights in neutral, I've noticed that my Accord has an intermittent rough idle. 200-4R Identification and Specs; All About the 4L70E; 8L90E Specs, Performance, and Identification; 6L80E Specs + Identification; TH400 Transmission Specs, ID, and Common Problems; Customer: I have an 89 firebird with 305 tpi. What Causes Rough Idle? The most common cause of rough idle is a vacuum leak or a failed PCV valve. When your engine heats up, a rough idle can manifest, characterized by stumbling or sputtering, often indicating underlying issues with your heat management system, fuel mixture, or other critical components. One time, it did completely misfire and limped back to my shop. Rough idling is when the engine runs unevenly while the vehicle is stationary. All the emissions, expect the PCV valve, had been removed, and the stock 305 had been replaced with a 350 4 bolt out of '75 C20. It will start then idle down to almost a stall then idles slowly back up, but remains rough until I step up the RPM's until the rough running goes away usually in 5 seconds or so. Menu. But, it At present you might be idling on the power circuit in the carb. Finding Symptom: Rough Idling. After sitting at a stoplight for maybe 30 seconds the RPMs will drop between roughly 600 and 700 while the foot is on the brake and then slightly bob up and down at a baseline that creates a reverberating engine exhaust effect bothersome to the ears I have also had intermittent rough idle events. Iron38 Discussion starter. After 2500rpm, it runs great. Right down to the mileage 38K, and the day, last Friday 2/1/13. C3 Tech/Performance - 1980 with rough idle - I have an 80 California model with a 350 instead of the 305 which was the original engine. i just picked the truck up, non-running, for $400. Some other causes of a rough idle. B. The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - 1990 C1500 TBI 5. Chevy man. After 25ish seconds after starting the exhaust note gradually smoothes out. Re: '86 305 rough idle 03-26-03 11:58 AM - Post# 201862 In response to chevyguy Yes it could. Also once running there is no 97 chevy k1500 with 305, engine rebuilt by shop 60k ago, last few months only drove truck 4-5 times, last time driving gave p0306, new plugs, wires, cap, rotor, cleared code, now gives p0300, took intake apart removed spider, sprayed/scrubbed each injector and poppet with cleaner, but no way of cleaning the line between the injector and poppets. intermittant idle problem, 305 v8 truck runs good, but at times idle rpm will drop, sometimes low enough for engine - GMC 1996 Sierra question Search Fixya Press enter to search. Spark knock when you press the gas. Anything that claims to seal a radiator leak can actually clog the radiator tubes. Pulled the plugs and regapped them . The items listed above are the most common causes of a rough idle. Reply reply 1990 gmc 305 engine rough idle on start up for about 5 seconds then it smooths out and the check engine light comes on. What an Engine Needs to. Then the idle will stay properly and idle down slowly in usually 5 minutes. Two Vacuum tests here show engine running smooth EGR Valve disabled Vs engine running rough EGR Valve disabled. Engine has not had a rebuild. 305s had different timing marks on the balancer and the timing cover than Problem: The van idles fine for a couple minutes and rough once the vehicle warms up. 2,596 Satisfied Customers. Once i got it home and gave her a snort of ether, she fired right up and ran pretty darn good, with the exception being she refused to idle. About 3 weeks. It can't be a Z/28 if it has a carburetor, the Z/28 in 1986 would have tuned port injection and be a 305. Very rich fuel smell with lots of smoke. Hancock, MD. No change Post: rough shake at idle (Topic#297987) sheet metal jay Forum Newbie Posts: 6 Reg: 05-27-13. First I noticed hesitation/ stumbling at about 55 MPH, then about ten miles later it started to hesitate / stall / surge and eventually came to a stop. E MasterTechnician A1-A8 w/L1,38 years experience General Motors Master Technician. On the right side of the carb there is a choke unloader valve. Save Share Had a little rough idle but starts fine , mine ended up being the ecm connections , I cleaned them with electric parts cleaner and di electric grease and its good to go ! Something to check out that doesn't Problems: When the car is cold, it stalls often until warm, idling is very rough, acceleration is rough, almost doesn't accelerate until you find the right spot in the pedal, once warm the car has a intermittant pulsing idle, jumps from 500rpm to 1500 rpm, and occasionally will stall at a red light. If you can screw either mix screw in all the way without it quitting, then that's likely one of your problems. Save Share Like. Further, this article will explore various reasons behind car misfires at idle and provide step-by-step solutions to resolve the issue. He replaced the fuel filter and added 20 gallons of fuel. I kknow that needs adjustment because when the car was idling rough 5 seconds after a good strong start, I opened it up more with my finger and it idled better Because of this, the crank spends a LOT of time in rotation before the next power stroke. if i give it any amount of gas it bogs out and almost dies. At idle ONLY I will have a miss you can feel but it won't register on the tachometer. Hey guys, to start off, whatever i'm experiencing is probably nothing. Jump to Latest 1962 Honda 305 Dream 1965 Honda 305 Dream 1971 Honda 175 scrambler. lately when the truck sits idling whether in the drive way, street, anywhere, i've noticed the truck idles rough, smooths out and idles rough again. The truck is a 2005 sierra 5. Understanding the common causes of rough idle can help you diagnose and address the problem, ensuring your vehicle runs smoothly. After about a half hour, the engine starts to idle roughly and sometimes stalls. The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - 96 Vortec 305--Rough Idle and Smells Rich The 1988 - 1998 GMT400 Chevy & GMC Pickups Message Board. 16 posts · Joined 2010 Add to quote; Only I have a rough idle, stumble under load, and I believe a misfire somewhere. To check it, first remove the vacuum hose, then compress the link sticking out of the valve, cover the hose nipple with your finger and release the link. 9 Cummins, leveling kit, 305/60/R18, 5" exhaust, afe intake, G56, bully dog triple dog. However, a faulty idle air control valve could keep the speed with the car idling rough when AC is on. Most modern engines should idle around 600 to 1,000rpm (with the majority falling closer to 600-800rpm). The pedestrian 305 cam times 178/194 with lift at . C. I have noticed lately there is an asssss load of threads about mis/rough idle. 1984 Chevrolet El Camino 5. I. Hey fellas, Ive gotten the best help and advice anyone could ask for from the guys on this site. Usually, it is the fuel pump, Tuesday I start it up and it started to run fine till i got half-way down the street and it started running rough and died. . Already checked/changed Did a compression test, all cylinders and they were consistent at 190psi. It seems almost as if the engine is bogging down on stopping and then picks the rpm back up and it goes away. Wagner Intercooler. 305 Reaction score 39 Location Florida Vehicle(s) 2015 Mustang Ecoboost Premium Vehicle Showcase 1. if i shut it off and start it again it does the same thing. You need to check the fuel pressure and the amount of fuel that the fuel pump puts out. Posts: 305. I've changed out the Idle control sensor it has a new distributor and cap new wires and plugs. When idling good, RPM's around 750 or so, when bad as low as 450. The RPM's stay at 750 just like always. I mean, this thing sounds absolutely terrible while idling, like an old muscle car idling without the muscle. Share Sort by: Best. bigthirsty496. 305 sbc good idle, Dies when in gear. When I spray carb cleaner into the T. No codes are thrown and rough idle usually goes away if RPM is increased. If the EGR is bad the engine will idle normal once you remove the vacuum line. Could this be a bad EGR valve? Yes it could. Initially it appeared to resolve all of my issues for a couple days then the rough idle returned and appears to be getting worse. Yeah, warm. The problem persisted. bikingplumber Discussion starter. If the purge tube cap looks to be in good condition. Now, when engine starts cold, it idles very rough up and down between 600 and 1200 RPM and almost dies. I've cleared codes several times and have narrowed down the typical codes to (300, 301, 305 - misfire on 1 & 3 cyl) and (108 - MAP volt to high) and (204 If you own a Chrysler 300 and it's idling rough, you may be feeling frustrated. Couple of questions. It will be located on Doing research, I discovered that a faulty Ignition Control Module could cause rough idling, a bad/clogged EGR could cause it, and of course, the spark plugs, which I You have a rough idle if you feel the roughness when your car idles, but drives smooth. New comments cannot be posted and votes cannot be cast. I recently got a tune-up (points, plugs, etc. A clogged fuel filter, fuel pump malfunction, 305 intermittent rough idle popping from exhaust. I was able to get the car idling decently and get the car home. 7 Vortec Rough Idle and Stalling. No codes were thrown during or after the problem. It revs up and down, shakes, gets close to stalling, and stalls sometimes. changed ignition control module, found couple vaccum leaks and repaired. Once you have the highest vacuum, speed the idle up to 650-700 and plug the vacuum advance back in. rough idle mystery solved 5th Gen Camaro SS LS LT General Discussions You are browsing camaro5 Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 285/305 Michelin Pilot Super Sports, Pray ported Intake manifold, Soler Throttle Body, Rotofab intake, EFI Tuning Flex fuel kit, full American Racing Headers Exhaust, 1 7/8" w/ cats H pipe and Idle problem w/ 1988 IROC-Z 305 tpi. Actions taken Had this problem for a few years now and finally I want to get to the bottom of it. Remove vacuum line from map sensor or pvc. Carb has been rebuilt by previous owner, new egr valve, looks like new cables 97 chevy pu 305 vortec, had cyl 6 misfire and rough idle, replaced fuel injector spider now engine starts but idle real high then dies Starts right back up. Level lift with 305/55r20 Open Country ATII Extremes. Idle in Drive is only around 600 RPM (seem low). RX Catch Customer: My 89 chevy caprice 305 tbi idles rough once warmed up and eventually cuts off. 1 2. Cold starts are fine but after I've driven it awhile, shut it off then start it again it idles rough, kind of loping. engine definitely idles better but still a little rough when going in gear, but at list it didn't die. Topic November 15, 2011 at 11:00 am #441297. The only vacuum advance I could get today was right at the peak of my intake manifold vacuum at idle. When the engine is cold it idles very nice but then when the choke and fast idle is off it will run rough. 98 posts · Joined 2015 Add to quote; Only show this user #1 · Aug 21, 2016. My truck is an 87 R10 with the 305 TBI. tune up-read your plugs and then check your timing. In this article, we'll look at some of the most common causes of a rough idle in the 300 and how to fix the problem. About a ~$70 part if you get an AC Delco, but very simple to Customer: I have a Chevy 1994 C1500 with a 305 engine that idles rough RPM drops almost to 0 then it surges. Note: Car was driven ~50 mi before incident occurred. ASE Certified as an L1 Master Technician with extensive experience in Chevy products. '04 (305/555) 3500 4x4 QC/SB 48RE 5" SS turbo back w/tip S&B CAI, CFM+, Carbon fiber taillights, Revtek 2 2005 5. It feels like its going to stall at any time while idling. I personally don't think the opti is the root of all problems, ya its a pita but a well taken care of opti will last years. This engine has always had relatively low vacuum, which is probably due to its 222/222 duration cam. 0L. Rear Raptor Shocks. I took it to the Chevy dealer I used to go to and they gave me the runaround, and told me the rough idle was normal for that vehicle. One reason I changed plugs was that the engine was running a little rough. Posts: 2. any advice would be appreciated Mechanic's Assistant: Is the rough idle intermittent or consistent? Here's what I did to solve my rough idle problem (or at least make it 2 times better). when it's idling rough, it's not like the trucks going to blow up, just enough for it to be noticed. 1990 WD250 5. Re: Chevy 305 has rough idle at 8 degrees timing but gets smooth at 16 degrees - 600 The weights in the distributor are NOT adjustable, the timeing needs to be a t 8? BTDC at idle. 6,142 satisfied customers. Stock cams sound smooth full out race cams lope like no other. Have tried cleaning Throttle Body & MAF Sensor & New Plugs. when trying to rev, engine sounds like it's bogging down. Intermittent vacuum leaks, cooling A rough idle without any codes could be caused by various factors, such as vacuum leaks, a dirty throttle body, a malfunctioning idle air control valve, clogged fuel injectors, clogged air filters, poor quality fuel, or even a blown fuse. Rough Idle 1989 Camaro w/305 tbi Archived post. This is usually caused by a change in the amount of air going to your engine, the Here is a suggestion, my brothers 1986 Trans Am with a 305 was ideling arraticaly, so I took off the throtle positioning sensor, and the idel air control valve and cleaed them using electronics cleaner. The last few mornings it's been around 25-30 degrees, I go out and start my truck to let it warm up and the exhaust just reeks of gas. I have installed new plugs, wires, rotor, cap and Kept getting 0301 and 0306 codes and a rough idle after changing plugs coil packs. I have used some spray cleaner in the carb jets which sometimes helps with Rough idle is a general term for an internal combustion engine that isn’t idling as smoothly as it should. I also hearing a strange sound coming from the vacuum canister. It feels like an old carb with a bad accelerator pump, give it Re: Chevy 305 has rough idle at 8 degrees timing but gets smooth at 16 degrees - 600 The weights in the distributor are NOT adjustable, the timeing needs to be a t 8? BTDC at idle. Increasing the volume of air that flows through the bypass circuit around the throttle increases idle speed. LT1Steve Discussion starter. ) The receipt also states "drained the fuel tank and blew out the fuel lines. The RPM needle may fluctuate, and the engine may seem like it’s struggling to maintain a steady idle. Have checked mostly everything and no codes on comp. Heat sink paste was like concrete so figured it fried. When they go bad, it won't idle, jumping from hi rpms to low enough to cause the I figured maybe i still had the timing off a hair, but after checking it today it is still spot on, and there is no rough idle or anything to indicate spark plugs, wires or fuel problems. Is the more lope of a cam is more of a performance cam. Hello, The GMC 89 TBI 305 in my truck eats up fuel badly in very cold starts. " The new set of wires seemed to have gotten rid of the firm jerking going up hills, or at least helped it a little, but it still shakes really bad at idle and still varies about 400-500 rpms going up hills when its not shifting. 0 TorRed stock /16 Dart SE 2. As it turns out one of the metering rods in the Street Demon I was using, was stuck open and letting fuel dump into the motor. My 305 did that, it's an early '80's. After I fixed it, it coughed and stumbled, just like it does when you replace the CPS. Your mechanic will systematically check the relevant components of your engine and its emissions system to isolate the cause of your rough idle. Stepping on the accelerator kills. In rare cases, it is caused by misfires from a bad spark plug or coil. It runs, sounds, and idles great for about a half hour under normal driving conditions. Compression readings that are consistent (within 10 percent of intermittant idle problem, 305 v8 truck runs good, but at times idle rpm will drop, sometimes low enough for engine - GMC 1996 Sierra question Search Fixya Press enter to search. Scanned obd and got po300, po301, po303, po305 as pending codes three days ago. If the gas was truly bad it would be a rough idle at all times. Here are some common reasons I have discovered that Idle problem w/ 1988 IROC-Z 305 tpi. Recently change: distributor, throttle position sensor, map sensor, iac, fuel pump and strainer, fuel WRONG!!!!! Rough Idle. 80% of the time people jump to opti's. After the first start the rest of the day is fine. it will eventually be going on a built 355 sbc rough idle mystery solved 5th Gen Camaro SS LS LT General Discussions You are browsing camaro5 Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 285/305 Michelin Pilot Super Sports, Pray ported Intake manifold, Soler Throttle Body, Rotofab intake, EFI Tuning Flex fuel kit, full American Racing Headers Exhaust, 1 7/8" w/ cats H pipe and Yesterday we were cruising at 2800 rpm foe about 15 minutes to meet up with people. The specific issue is that idle speed seems normal in neutral, but in gear the id It has a very raspy exhaust tone when it first starts and idles at about 1300 RPMs for about 20 seconds and then the idle drops to 1000 rpms and stays there for about 10 seconds. When a vehicle is in “idle” mode it means the engine is not under load or in motion. 134 posts Hi guys I’m having problems with rough running on the old 305 Iv cleaned the carb but it runs and idles with the choke out but rough and lumpy when I’m so I stripped the carb again to clean the 2nd idle jet the little tiny one but it’s clear I can’t get the slotted screw out the choke lever but all else is spotless in the carb also Iv notice it has a two stage reed valve which are a Kept getting 0301 and 0306 codes and a rough idle after changing plugs coil packs. Home; GM Automatic Transmissions. Fuel System Issues. Save Share Reply Quote Like. Jump to Latest 21 - 29 of 29 Posts. 96 Vortec 305--Rough Idle and Smells Rich The 1988 - 1998 GMT400 Chevy & GMC Pickups Message Board. 0L Failed emissions only for CO, recommendations. it was the fast idle cam you guys were right i just had to get my finger under there to release it. Drive, 2nd, 1st) my car idle "settles" around 750 on the tach, but then starts to fluctuate around there, moving up to 900(or so) then dips down to about 500 on the tach. Temp is working and is reading 180*F. Driving in gears 1-3 are bearable but in 4 and 5 there is little power and the truck surges, stumbles, and shakes awful. I had that problem. Give 30 seconds of idle time after each 1/8 turn for the vacuum level to stabilize. Replaced fuel filter and fuel pump. Rough, lopey sound with the performance you deserve in your Ford SB 221-305, by the Rattler Cam - developed by Howards Cams. It is a classic fuel starvation issue - so you will need to check out the fuel systems from gas tank to carb. It is not drivable, stalls when put in gear. The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - As I said I'd like a rough, noticable or choppy idle, and get some more torque out of the motor. It was running strong (for a 305!) until yesterday. This is an older thread, you may not receive a response, and could be reviving an old thread. They start by checking the reason for the "no code" problem. Most of the time it idles really smooth. Start the engine. Posts: 829. 200-4R Identification and Specs; All About the 4L70E; 8L90E Specs, Performance, and Identification; 6L80E Specs + Identification; TH400 Transmission Specs, ID, and Common Problems; Rough idling; Dying at stop signs (in extreme cases) Poor fuel economy; How to Diagnose the P0305 Code. 15 posts · Joined 2000 Add to quote; Only show this user #1 · May 12, 2000. The 2025 Calendars are HERE! Doing research, I discovered that a faulty Ignition Control Module could cause rough idling, a bad/clogged EGR could cause it, and of course, the spark plugs, which I replaced about two years ago 96 Vortec 305--Rough Idle and Smells Rich The 1988 - 1998 GMT400 Chevy & GMC Pickups Message Board. 305/50r20 Hankook / 1. Chevy Monte Carlo Rough Idle Diagnosis Start With the Check Engine Light. I've read most threads on the subject (much appreciation!), and will try some more solutions today. Engine seems to surge when it is in that state Stock 1984 Monte Carlo V8 305 Sport Coupe Custom Luxury 164K Miles. I've been using a vacuum gauge to adjust the idle mix screws and base I have a 1985 Chevy c10 with a 305 and a 4bbl Rochester Quadrajet. Again at cold temps (45*F out this morning). Then after that 5 seconds of rough idle it goes back to normal for about 10-15 seconds, then another My Jeep idles rough and I love it because it kinda shakes everything and feels like I have some real power up there. Save Share Had a little rough idle but starts fine , mine ended up being the ecm connections , I cleaned them with electric parts cleaner and di electric grease and its good to go ! Something to check out that doesn't A camshaft with greater duration and lift is the key to a lopey idle, but the rougher the idle you want, the more vaccume power you lose and and less low end torque you lose, as the powerband of the cam rises with the roughness of the idle, in simplified terms. There are several potential causes of rough idle and stalling in a 5. When I first bought it (in February), it would idle very rough and was slightly hard to start when cold. It pops from the exhaust and idles roughly. Here, we explore the primary causes of rough idle and potential solutions. I personally don't think the opti is the root of all problems, ya its a pita but a well taken care of opti will last WOOD HAULER EXPRESS small block chevrolet for power idling checking over after making some weekend pulls If you own a Chrysler 300 and it's idling rough, you may be feeling frustrated. It starts idling rough at stop signs and running rough upon acceleration after driving it about 4+ miles or that is when it seems to start acting up. Those gears are almost unusable. Check it for a leak. Wow. I had a intermittent rough idle, and a very lopey high idle. What an Engine Needs to It starts fine and was idling great previously. The truck will drive fine, then I will be sitting at a stop light and it will be idling rough. The most common cause of a rough idle is misfiring. before - Pontiac 1985 Firebird question. Then engine starts rough idles and dies. I have also read that rough idle on start up is common on these cars. I think as a result of my engine troubles, I get maybe 12mpg on a good day, driving conservatively in the city. 2005 5. Before I get flamed for posting yet another rough idle post. It could also be an ignition mis-fire caused by fouled or improperly I adjusted the carb and timing and found no vacuum leaks, trying to figure out why the idle is so rough. Have a '05 300C that occassionally (intermittently) runs extremely rough at idle. Every other SBC engine will run like that, what makes you think you should need something else. The truck ran like pure hell. Discussion starter · #21 · Oct 21, 2020. Hard starts, rough idle, stalling. I did all the normally recommended things like plugs, plug boots, cleaned sensors, cleaned throttle body, idle relearn, and KAM reset. This can result in vibrations and a shaky feel in the cabin. Today’s cars rely heavily on sophisticated electronic systems and computer controls, which my 86 iroc-z with 305 tpi will start but stalls quickly. 3, 4L60E, Z71, 4x4, has 79,000 miles. Senior Member; Posts: 3795 update, i was able to get it to idle at 800 but it is extremely rough idling, timing is at 8 degrees btdc. 2009 - 2014 Ford F150 - Rough idle/chatter/shake 5. This last time it happened I also got the check traction control and stabilitrak. I guess they forgot I previously had a 2016 Tahoe. To fix the problem with your engine idling speed and no codes, you should visit your mechanic for assistance. I will drive on the highway and it will drive fine. Hi guys I’m having problems with rough running on the old 305 Iv cleaned the carb but it runs and idles with the choke out but rough and lumpy when I’m so I stripped the carb If it only does it at idle you should adjust both idle cicuit screws by running them all the way in and then back them both out about 2 1/2 to 3 turns each. I changed the plug wires and Rough Idle, '84 Caprice, 305. The root cause of the problem could be anything from a worn spark plug to a costly internal engine concern. Then map sensor code 33 came up. Tags 305 monte carlo popping rough idle. Jump to Latest 11K views 15 replies 7 participants last post by Iron38 Dec 27, 2016. A rough idle can be caused by (CAC) charge air cooler leaks. 56's, 4" superlift, 33's 305 monte carlo popping rough idle. Open comment sort options Reply reply bald2718281828 • Seems consistent with Idle Air Control Valve failure. Also once running there is no The major problem with all of this is it really just started doing this. For example, if your key turns without resistance and there is a rough idle, then you may have a faulty ignition system. Check Engine Light The engine has had a problem with a high and unstable idle speed that I have been working to track down for quite some time. It could also be caused by other air-fuel mixture related issues like bad fuel injectors, EGR valves, or low compression. Answered by John in 4 mins 14 years ago. A few weeks later, I started getting a very rough idle. Start by turning them both in 1/8 turn each, alternating one at a time. Resonator Delete | 2. drives car 40 min to work and back. Skip to content. 5" Front Level + Rear Block Delete / Eibach Pro Shocks / Firestone Air Bags The most common cause of a rough idle is misfiring. After about 45 seconds, idle smooths out and runs great. I had a bunch of other crap to get to today, and no time to whip up a piston stop and correctly mark the balancer, but that looks like it answers my timing question 100%. 1987 gmc sierra 305 tbi. saltydbs OP. It r Rough Idle Rough Idle. This topic has 6 replies, 5 voices, and was last updated 12 years, 7 months ago by . S. half way home started losing power, then started missing. Rough idling is a sign that a part of your engine isn't working properly and, over time, can result in poor gas mileage, starting issues and major engine problems. 350 TBI/auto Rough idle & hesitating Everything was good until I stopped at a red light and the idle dropped really low and rough, when the light changed I tried to accelerate but had no power, stumbling and hesitating, felt like I was running out of gas but had almost 1/2 tank. should i adjust my APT screw? the reason i have this on my 305 is just to test it out to make sure everything works. 4L - Last summer while sitting in traffic, waiting on the on ramp to the freeway, my truck started to idle really rough. 56 rear gears, and most likely a mild cam (all from previous owner). Would not duplicate once engine Several weeks ago, my 99 Solara with 125K started to experience a rough idle in drive mode when cold. 9, NV4500, 4x4. My mom's Tahoe idles really smooth compared to my Jeep and I have to look at the tach to see if it's running. Found out GM used 4 and 5 pin modules in the HEI. No noises to indicate a lubrication problem. So if you have a rough idle with your 4 cylinder Honda, this might be a contributing factor to your rough idle. 7 Vortec engine, including: 1. 56's, 4" superlift, 33's 305 TPI Started engine and at idle it was steady at 60psi then withing a few minutes truck began to act up and fuel pressure just bounced back and forth 58 to 60psi and a sudden drop to 55psi. Here is a more detailed list of the signs of a bad or failing idle air control valve (IAC) to look for: 1. When a Chevrolet vehicle triggers diagnostic code P0305, it indicates that a misfire has been detected in cylinder 5 of the engine. It is the stuttering portion of the problem I find most concerning because I know for a fact 2007 RAV4 4 cylinder with approx 120K miles that randomly semi-rough idles intermittently at long stoplights. Starts OK, but then runs poorly. 385 on a 108 LSA it’s idle is 650. The Idle Speed Control (ISC) valve, also called an Idle Air Control (IAC) valve, is used to regulate idle speed. If you want a low end torquer, sometimes you need to consider it and make a sacrifice This takes time. My car is a 1991 cadillac brougham d elegance v8 305 5. And the most common cause to mention is the carbon buildup around the valve. Creator. Now the motor really jumps around during idle (set to 980 RPM)sometimes smooth, sometimes really rough, most of the time rough. check 1st spark plug on either side of engine and they look good. Then I read somewhere where a dirty throttle body can lead to poor idle. com, and a few others to no avail. I took it into the dealer to get my new wheels and told them about it. The engine does SOUND rough but mine does not actually FEEL rough. I have a 1991 Modern Vehicle Considerations. Try pulling the vacuum line off the EGR valve when the engine is warm and idling rough. When I went to plane the boat after idling it would not accelerate. Ran a big bottle of fuel cleaner, so many ounces per tankfull until it was gone. Jump to Latest 47K views 15 replies 11 participants last post by colkerr Jun 21, 2016. Rough idle. The longer you let the problem go, the more likely it is to develop into something more serious. I'm looking for a diagnosis here. 7L Idle is surging when warm. All the vacuum lines from the canister were just hanging there, non of them go anywhere. It feels like an old carb with a bad accelerator pump, give it Author Topic: 1979 chevy 305 low oil pressure at idle!?!?! (Read 21718 times) LTZ C20. Please know I have spent nearly 2 months researching this issue on Silveradosierra. use timing light and double check with scan tool-most 91 305's were high outputs which requires higher octane than regular (fuel grade revelatnt to compression ratio and altitude) you may want to check fuel pressure Battling intermittent rough idle on my RAV. played around today with the vacuum advance and tried a new one. here's a link to th The most common cause of a rough idle is misfiring. 0 Vortec with a PO300 random misfire/rough idle issue. -Rough idle/distinct knock that is worse when engine is cold Cylinder 1,5,7: 305 PSI Cylinder 3,4,8: 300 PSI Cylinder 2: 310 PSI Cylinder 6: 295 PSI (The altitude here is 5000 ft. I have discovered that the prob Home › Forums › Stay Dirty Lounge › Service and Repair Questions Answered Here › 95 Silverado 305 rough idle. Because there are so many potential causes for code P0305, diagnosis can be difficult. B. passenger side exhaust manifold is heating up to 600 degrees at idle while drivers side only at 350. Newbie; From what I read in the booklet that comes with it you turn them down till the idle gets rough then turn them up about 1 to 1 1/2 turns till it smooths out then do the same on the other side. Rough running, hesitation, and/or jerking when accelerating; In most cases, there are no adverse conditions noticed by the driver; A Compression Test and an engine idle Manifold Vacuum Test are two very important methods of determining the mechanical condition of the engine. 73 gears and a stock torque converter, you NEED low end torque and the Performer grind very good from idle all the way to 4500-5000 RPM. no issues once idle 600-700 after that. That's why I "used to " go to them. Rough idle, #4 showing bad on scan tool. 1991 caprice w 305 around 160,000 paid $600 sold for $1200 1976 datsun 620 truck Proud owner of a Just recently, I got the 'Increased Emissions' fault in the I-drive, and the Service Engine Soon light stays on constantly. If you have a rough idle with slight knocking noise and it doesn't change when you push in the clutch pedal then it is most commonly injectors. After While it can be tempting to ignore a rough idle for a while because your vehicle is still running, this is the last thing you want to do. use timing light and double check with scan tool-most 91 305's were high outputs which requires higher octane than regular (fuel grade revelatnt to compression ratio and altitude) you may want to check fuel pressure 302 rough idle, hesitation, backfire through carb. Also replaced coil. These include: Head Customer: 1999 Chevy van w/ 305. The standard cam is not unlike the timing used for the 87-95 Swirl Port, TBI engines both 305 and 350. With 2. Compression readings that are consistent (within 10 percent of I have noticed lately there is an asssss load of threads about mis/rough idle. Also/or to test if its the MAF, disconnect MAF and see if idle improves. She would turn on engine when cold and would run rough. This has progressively got worse into random misfiring and lack of power on hard excelaration. 87 El Camino 305 4 barrel carb, slightly rough idle, then stalls after about 150 feet. Common causes of rough idle. 91 camaro 305 tpi runs rough at idle sometimes stalls and has power loss. Still occurring. MonteCarloSS. I've also had this issue twice with my '12 5. Use a deemed tool with a cut off wheel to make a tiny slice in the tip of the adjustment screw. Rough Idle, HELP! Jump to Latest 5. Customer: 1995 Chevy K1500 203K mi. Here are the top 10 most common causes of a rough 1987-1995 Chevy Idle Air Valve replacement to fix Idle issues on the 5. Idle jumps up to 1500 and down to 1000. 2017 Oxford White GT 6R80 California Special ESS G3X, G4 Intercooler, 100mm Pulley, Tial 50mm BOV, 1320 Junkie Ported 18 Manifold, FORE L2 Fuel System, ID1000s, E85, Lund Tune, LTH 1-7/8 Headers, Stainless Works Legend Series Active Catback, GT350 Rear Valance, DynoTech Aluminum It also sounds very rough while sitting in idle. I assumed that the new plugs would fix the problem, but it had minimal effect. Also, on highway, when I hit the accelerator, I get a dead lull for 1/2 second like a stall, then a very strong hit. Reinstall, and Customer: I have a Chevy 1994 C1500 with a 305 engine that idles rough RPM drops almost to 0 then it surges. Range AFM delete, 2. (The idle air Common Causes of 5. My probelm is this. However, sometimes, the rough idle occurs when you change your spark plugs. When the air conditioning is turned on, the engine will stumble and stall at idle while in gear. Tried starting it a few times before it finally kicked inidle I just read on Ianx's Alldata sticky that an issue with the SLK55 back in 8/2005 was a rough idle or "idle felt through body of car with car in in 'P' position. com Forums Technical Discussions General Technical Discussions 1986 Monte Carlo SS 305/Quadrajet Rough Idle/Gas: Forums Calendar Active Threads: Previous Thread: Next Thread : Print Thread: 1986 Monte Carlo SS 305/Quadrajet Rough Idle/Gas #1050967 05/21/17 06:36 AM. I will have to see if putting the transmission is neutral and revving the engine to 1000RPM helps any. While the idle speed is fluctuating my voltage drops dramatically. Z51 sways, Corsa sports, 1 7/8 American racing headers, Halltech intake, Ace Slicks in hyperblack, 305/275 PS2s Quote from: rigidthumper on November 08, 2024, 07:11:03 PMCheck the intake manifold for the purge tube cap (#11 in this pic) . Your story sounds almost exactly like mine. The problem is that it surges when you start it and put it in. May or may not come back when returned to idle. and idle mixture screws are 1&1/2 turns out, any ideas of why its running so rough? valve adjustment? i checked for It also sounds very rough while sitting in idle. I chalked it up to the larger engine size but it is idling a bit hard. Hello Iam new to this forum!! just like the title says I'm lately having issues with my Lincoln ranger 305g,, It welds fine, I got power on all outlets ,, only issue with it is it runs high idle all the time ,,,, this are some of the things I Have checked already : my coil was a little dirty so I decided to get a new one ,, bought a new battery did complete tune up,, I jumped two cables I've got a 2007 Silverado 2500HD 6. 84MC #910593 12/31/11 06:27 AM. Replaced the Demon with a 600 cfm Edelbrock performer This was recorded after driving the car around for a bit - so it had warmed up at this point. Idle mixture on the carb needs adjusting or the Remove each screw, make sure you don’t drop the spring behind it. iIt idles rough, will not rev up. When cold, the engine easily fires right up. 81 is a CCC (ECM The rough idle only happens on very first start up of the day. This creates a ‘choppy’ power delivery that may be most noticeable at idle. My son and I just completed a total rebuild of an 88 Camaro with a 305 TBI. Same running condition. 2L - rough idle? Jump to Latest 53K views 20 replies 10 participants last post by dlucky_0803 Sep 11, 2020 I have a 1984 Chevy monte Carlo ss g body that has a stock sbc 305 with quadrajet carb. Accelerates fine and top end is fine. I started it back up gave it a couple of revs, cause i thought I just bought a 96 Silverado 305 that runs great down the highway but idles rough and spits and sputters a bit at take-off but picks up shorty after with great power and it's not My 1986 chevy truck with a 305 has a little bit of a rough idle. I don't get a temp light, and the engine seems to run at normal temp, although I don't have a temp gauge at this time. Jump to Latest So finally found the culprit for the rough random idle. Worn motor mounts can make it seem like the idle is rough especially if the engine now rests on metal. This is lower than a the typical GM mild cams which the L69 times like the earlier standard V8 cams. 7 TBI This is a very easy fix to possibly remedy your idle problem. S. Search Fixya You should have your TPS and EGR looked at as those cause rough idlesOther causes are bad idle air control valve, bad plugs, bad distributor cap & rotor, a bad wire, bad O2 Re: Chevy 305 idles great in park but very low & rough in gear? Thanks for the link and ideas, geezer. I kknow that needs adjustment because when the car was idling rough 5 seconds after a good strong start, I opened it up more with my finger and it idled better A little update. 3 I get rough idle then further down the road an engine light which ends up being a misfire on cylinder 1. Likes: 22. No check engine light or misfire code since. it runs fine for a few secs. As for maintenance, she got a set of the proper AC Iridiums a few weeks back - the old ones looked fine - only issue was that they were Bosch. L. If you really want a good explintation on cams and how they react ask Brent at B2 Motorsports. 89 CJ/YJ thing 350 TBI, 700r4, NP231 SYE, 3 inch body lift, currie 9" rear with lock-right and 4. 2007 Mega Cab: Coated pistons, machined rods, balanced rotating assembly, Colt Stage 4 cam, Twin FASS Titaniums feed twin 33% over CP3's Industrial Silver 64 over S483 EFI Live arty018:. Joined Oct 16, 2020 · 20 Posts. Also stumbles and occasionally will stall when first started in the morning. ), but it still runs as described above. New Jersey slowly. If it is still rough open There is an idle air control valve that controls the idle rpm, which causes the nice smooth idle. Jump to Latest 21 - 32 of 32 Posts. Re: Chevy 305 has rough idle at 8 degrees timing but gets smooth at 16 degrees - 600 timing chain could be very loose, you can check by removing the dist cap, rotate motor in normal direction untill timing mark is at "0", mark rotor, rotate crankshaft in opposite direction untill rotor moves. Instrument cluster was replaced at some stage. 350/. My probelm is I cannot find what is causing this. if i try to give it gas while it idleing rough it stumbles and sounds like its missing and running rich. Recent Oddities: 07-09-07 11:12 AM - Post# 1204123 i have a 1989 chevy 1500 4x4 with the 305 tbi engine. It can be not bad some mornings and then on other it shakes the car. Temperature in mornings is around 70F or 20 C. I checked idle vacuum and it is 15", with a fast needle fluctuation of about 1" of vacuum. Sep 25, 2018 #6 I did a KAM reset and it resolved it temporarily but it's back, MPG isn't effected and its not stalling but it reminds me of my 68 mustang with a hot cam in it. a tight chain moves the rotor instantly, a worn chain might get 10-20 degrees Hello all, my truck idle's rough when it's warm. Car is a 3rd gen Monte Carlo When the engine is set to 6 - 8 degrees BTDC the engine idles rough at 600 - 700. Also, if I let it idle while in part, it would die after 1-2 minutes. There is a smell of gas in the exhaust and on the oil dipstick. 81 is a CCC (ECM Hard starts, rough idle, stalling. Re: Idle Setup Procedures. Register or Log In To remove these advertisements. 150k miles on the truck. 05' RK - 510 chain drive cams (06-07 cam plate design), high compression SE 103 top end, T-Max, closed-loop with 2 Should idle at 650 revs. But there are many other elements under the hood that can cause this problem. On take off, it still stutters and in 1-3 gear, runs like it has a miss until about 2500rpm. I never noticed the rough idle before, and it certainly did not “stutter” while driving before. " I think I feel this rough idle too. My Bird refuses to stay running or even start sometimes but once running idle is erratic. A. Only show this user 1) About 125K. Rough erratic idle. Also purchased 1 injector to try and locate a common cylinder issue. 200-4R Identification and Specs; All About the 4L70E; 8L90E Specs, Performance, and Identification; 6L80E Specs + Identification; TH400 Transmission Specs, ID, and Common Problems; 6. It's also The car was started up after sitting for about 30 minutes (car was still warm) and the engine began to misfire and vibrate causing a very rough idle and the engine to shut-off after about 5 seconds. Met up with them and stopped for about 5 minutes letting engine idle. The rough idle only happens on very first start up of the day. Reply reply The most common cause of a rough idle is misfiring. Thread starter DWCaprice2017; Start date Jun 18, 2024; Community. I got code 32 (EGR issue) and code 45 (rich condition). As for recent changes, I put 1oz / 30ml of tracer dye in the crankcase today, on the drive cycle before it started idling rough - but I know that's not the issue. 005-. Started after buying gas other day. The van is fine while moving, except for the terrible mpg. SES light comes on every day now. I have an 1984 El Camino with a 305 engine. UPDATE: It now idles fine. now when i took it for a test drive. Stock 1984 Monte Carlo V8 305 Sport Coupe Custom Luxury 164K Miles. Send Private Topic View Profile. AFE Stage 2 Intake. It completely cured my rough idle, intermittent hard/bucking start, and lopey high idle. It finally died, and it was the distributor module. If I give it gas it will run but rough at lower rpm but smooths out at higher rpm. Your idle mixture screws are probably sealed if it's still the factory carb. I had a question from someone with a 3rd Gen Camaro with a 305 TBI engine. 04 with 200k, been a great truck, maintained well, no major issues. No Codes Having an issue with a rough idle condition, goes away at about 700 rpm. The IAC valve opens a small bypass circuit that allows air to bypass the throttle. I had rough idle nothing like car wanting to shut off or anything Author Topic: Setting Idle Mixture on a 305 with an Eddie 1406 (Read 3750 times) SquareBody86. uavr nmbep mhuu hkqs irand lhzlv ldserbze hxxdstjj qajp kipvt
