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Rough idle when engine is runningat high speeds it runs great.when i idle down sometime it wants to die.i have idled it up and changed the spark plugs.also put seafoam in gas tank twice and put new carb kits.

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Fuel mix is one of the most important and most overlooked issues. I have had lengthy debate with other engineers and proved my point many times. Ensure the mix you are using is the manufactures recommendation. For example most modern out boards run on 100 to 1, how ever some operators still insist on using the old 50 to 1. The engine runs rough at idle and is hard to start. can be costly. Happy boating Timo.

Posted on Apr 27, 2010

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1996 honda accord rough idle and dies


Do the following

Here are the most common causes of idle surge, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake

Aug 18, 2017 | 1996 Honda Accord

1 Answer

I have a 1990 dodge dakota 3.9 liter v6...idles rough and stalls out at stopping...i have changed cap rotor plugs and wires...and also the throttle positioning sensor...no change..any ideas would be...


Do the service below.

Engine stalling and rough run issue at low speeds

This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control. If this doesn't improve the problem you have mechanical problems in the engine like a low cylinder die to worn rings or leaking valve seats.



Jun 23, 2012 | 1990 Dodge Dakota

1 Answer

92 NISSAN WITH BOGGING AT 2800 3500 RPM AND AT LEVEL SPEED 4CYL AND 5 SPEED


For this types of problem,there are few help inks to troubleshoot the problem.Click the link below to go through the troubleshooting procedure to resolve the issues :----Idles rough and quits when gas pedal is pressed less? http://technoanswers.blogspot.in/2012/01/1999-ford-f-150-idles-rough-and-quits.html-----------van idles rough? http://howtobyme.blogspot.in/2012/01/2004-ford-freestar-van-idles-rough.html
--------------runs lean and idles rough? http://technoanswers.blogspot.in/2012/02/ford-runs-lean-and-idles-rough.html
-----------Car still runs Rough after tune up? http://howtobyme.blogspot.com/2011/12/car-still-runs-rough-after-tune-up.html
------------Idle flair is noticed on car? Rough idle? car will not idle? Erratic idle speed? http://technoanswers.blogspot.in/2012/02/idle-flair-is-noticed-on-car-rough-idle.html
----------High rpm in neutral? Inconsistant high RPM in neutral? http://technoanswers.blogspot.in/2012/02/high-rpm-in-neutral-inconsistant-high.html
------------Engine Backfires? http://technoanswers.blogspot.in/2012/02/jeep-backfires.html----------- Nissan stalls and bucks on Acceleration?

http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-stalls-and-bucks-on.html

-----------
Nissan Pathfinder Backfires? http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-backfires.html
---------How to adjust rpm? http://schematicsdiagram.blogspot.com/2011/12/how-to-adjust-rpm-on-2009-dodge-charger.html
------------Engine cuts out at 3000 RPM? http://schematicsdiagram.blogspot.com/2011/12/engine-cuts-out-at-3000-rpm.html
----------This will help.Thanks.

Feb 17, 2012 | 1992 Nissan Pickup

1 Answer

1988 Bronco II dying and running very short time. It will die while going down the road. We have replaced the TFI module and that didn't work. The idle is rough and sometimes if we get it cranked after...


I had 2 experiences like that. 72 ford pickup I was watching it try to run after I got home from work. It was dark and I could see sparks. I also noticed the coil was very hot. I changed to coil and all was well. I had a 94 sunbird it ran good at high speeds but I could not keep it running at a stop sign or stop light. I change the plug wires. I had not code. I suggest you check the code if you have a check engine/warning light. It can help narrow your search.
I don't even remember if the 72 had codes back then but I have learned to check them any time I have a check engine light.

Aug 12, 2017 | 1988 Ford Bronco II

1 Answer

My 1993 jeep grand cherokee laredo idles rough after warm up. it also idels high around 2000 rpm at start up sometimes and needs to be shut off and restarted to calm idle speed. whats is causing the...


usually rough Idle is not noticable at high ildle. Once it is idles normally try Disconnecting one injector at a time. If the idle stays the same than that cylinder is the culprit. Remove that spark. If it is wet than do a compression test. Should read better than 100lbs of compression.If compression is good take a spark plug and hook it into the end of the plug wire.Lay it across the intake,start the car and watch for spark. If you have spark than you probably have a bad injector. A miss will cause the vehicle to idle high. The computer is trying to keep the car from dieing out. Hope this helps. No spark do a tune up.

Dec 05, 2010 | 1993 Jeep Grand Cherokee

1 Answer

I got an diagnostic and it said the idle air valve is bad.i got it changed but its still runnin rough


A idle speed motor will not cause your engine to run rough.It might idle high or stall. If your engine is running rough check your spark plugs and wires along with your cap and rotor first.

Dec 02, 2010 | 1991 Cadillac DeVille

2 Answers

I have a 2000 Honda accord with the 3.0 V-6. The engine light has been on so long that it burned out. Now it shows emission code and is dieing sometimes when I stop. I cleaned out the carboned up front...


Have the ODB II codes (computer error codes) pulled and reset. Some auto parts stores will do it for free. Make sure you write them down. You could need new spark plugs and/or wires.

Oct 09, 2009 | Honda Accord Cars & Trucks

2 Answers

1993 olds cutlass supreme 3.1 multi port loading up at idle


Here are some of the causes of surges, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

Apr 07, 2009 | 1993 Oldsmobile Cutlass Supreme

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