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AudiA3 Bad Idle and rough at certain revs

Hi there, I own a 97 1.8 non turbd a3, the car idles roughly, and revs slightly fluctuate more when cold, I also feel vibrations through the accelerator at certain revs and gear ratios. Ive had the maf sensor replaced, new sparkplugs and leads. I'm slowly eliminating the problems, like cleaning throttlebody etc, I was just wondering if anyone had any ideas?

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Buy a bottle or two of gas line anti freeze, it absorbs any water that may be in your fuel. add one bottle now and one the next time you fill up. if it is water as i suspect you will notice results almost immediately.

Posted on Oct 05, 2009

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Posted on Jan 02, 2017

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Audi A3 2.0TDi Sport 2006 runs fine on idle when cold but has a slight misfire when hot, I have changed the fuel, air and oil filters, where should I look next?


Diesels can idle rough, if no check engine light I wouldn't worry. Check the injectors, vw diesels have the injectors work loose allot

Nov 02, 2014 | 2006 Audi A3

1 Answer

Car engine idles really high then really low, why?


It can be issue with IAC( idle air control valve) causing the problem.


There are many other possibilities causing these idle issues. Engine idles rough.

There are few help links with solutions to troubleshoot such idle issues.

I suggest you refer the link below and follow its troubleshooting details:------

Click the link below:-----

Ford Expedition IAC valve replacing

http://technoanswers.blogspot.com/2012/12/ford-expedition-iac-valve-replacing.html

Bad miss at idle?

http://technoanswers.blogspot.com/2012/01/bad-miss-at-idle.html

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Stumbling and stalling at idle after engine rebuild?

http://schematicsdiagram.blogspot.in/2012/03/stumbling-and-stalling-at-idle-after.html

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1999 Ford F-150 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

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Engine stumbles coming off idle when warm?

http://repairhelpcenter.blogspot.com/2012/01/engine-stumbles-coming-off-idle-when.html

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Erratic idle on car?

http://schematicsdiagram.blogspot.com/2011/12/erratic-idle-on-car.html

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Cold start problem and vehicle shudder around 2500 to 3500 rpms

http://repairhelpcenter.blogspot.com/2012/10/cold-start-problem-and-vehicle-shudder.html

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Low idle when cold out side?

http://repairhelpcenter.blogspot.com/2011/12/low-idle-when-cold-out-side.html

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GMC Sonoma Stalls and idles low

http://technoanswers.blogspot.com/2012/10/gmc-sonoma-stalls-and-idles-low.html

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GMC Idle Air Control (IAC) Valve Replacing?

http://schematicsdiagram.blogspot.com/2011/12/gmc-idle-air-control-iac-valve.html

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1996 Camry intermittent engine failure while idle?

http://repairhelpcenter.blogspot.com/2011/10/1996-camry-intermittent-engine-failure.html

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Engine quits at idle?

http://repairhelpcenter.blogspot.com/2011/10/engine-quits-at-idle.html

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Car overheats and Air blows hot at idle?

http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html

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High Idle Problem

http://repairhelpcenter.blogspot.com/2012/10/high-idle-problem.html

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While stop engine idles like cylinder missing?

http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

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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

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High rpm in neutral? Inconsistant high RPM in neutral?

http://technoanswers.blogspot.in/2012/02/high-rpm-in-neutral-inconsistant-high.html

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Vehicle stumbling at idle and shows code 54?

http://schematicsdiagram.blogspot.in/2012/03/vehicle-stumbling-at-idle-and-shows.html

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Rough idle, staling and Erratic shifting?

http://technoanswers.blogspot.in/2012/03/rough-idlestaling-and-erratic-shifting.html

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While stop engine idles like cylinder missing?

http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

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These details will help.

Thanks.

Feb 15, 2013 | 2003 Pontiac Grand Am

1 Answer

Codes 171 and 174, rough cold idle, maf replaced 17 months ago----could it be tps or iac motor


Check for a loose or broken vacuum hose or attachment.Or the air intake hose to throttle might be loose. don-ohio

Jan 04, 2013 | 2001 Mercury Sable

1 Answer

I have a2004 mazda 3 s when the a/c is on the idle gets rough when the compressor cycles on and off. A/c works intermittenly,can feel the idle fluctuate even while at speed and slightly accelerating.


when the ac compressor comes on, the engine should rev up a little to compensate for the strain of the compressor and if this is not happening, then you would get that rough idle. Some engines have a valve control to let in a little air into the engine intake so that it revs a little. I think this is called an AC step up.

May 29, 2012 | 2004 Mazda 3

1 Answer

2000 beetle cold start rough idle until it warms


Could be the fast idle sensor check to see that the vacume line is hooked up properly.

Mar 12, 2010 | 2000 Volkswagen Beetle

1 Answer

Revs up and runs rough then stalls, it runs very rough, it can barely idle, put in gear and it stalls


I would like more info on the vehicle, as to the engine size. There are vacuum leaks on this engine, both the 4cyl and 6cyl. The injector lower seals are prone to cause this condition, but to check for this and to do it safely, is have it smoke tested with the proper test equipment. The EGR valves can also stick partially open, causing a rough idle and then a idle fluctuation and a stalling problem. Another poss cause is the idle control motor is failing. This vehicle should be taken in for service at a very reputable repair shop. If not properly diag, will cost hundreds of dollars just to "PUT PARTS ON IT UNTIL IT RUNS GOOD".

Jan 07, 2010 | 1999 Ford Contour

1 Answer

Rough idle, car has no ICV, idle control valve, so what now?


It will deffinitely have a form of idle control, sometimes it is part of the throttle body but there will be one... 100% certain.

Rough idle as in lumpy will not be an ICV related fault, as with ICV it will either have solid high revs or none at all.

It will either be an inlet vacuum issue - split hose, gasket, MAFS etc or an irratic voltage caused by things like a Lambda or worn throttle potentiometre

Describe the rough idle in more detail if you can, also are you UK or USA etc.

Do you know what cc and engine code your car is?

Dec 15, 2009 | 1998 BMW 3 Series

1 Answer

High rev, rough idle in golf


If your car is fuel injection,try changing the cold start temp sender.

Jul 17, 2009 | 1997 Volkswagen Golf

1 Answer

1983 honda acc cold start wont stay running when cold idles rough


try checkin your idle air control. most of the time it is a vacuumn line going into intake.pull it off and if the car revs up dont worry, it wont hurt it. if it does simply put it back on, if it dies you have a bad vacumn.

Jun 20, 2009 | 1983 Honda Accord

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