Completely random stalling
Thread Starter
Audiworld Junior Member
Joined: Feb 2010
Posts: 13
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Completely random stalling
Hey! First I must thank you guys for all the the help you have been over the years. It has made owning my car far easier.
The car in question stalls randomly. It also will have a rough idle occasionally. The rough idle does not seem instrumental in the stalling because it does not always idle roughly before it stalls. It doesn't seem to matter if the car is warm or cold, although, it does seem to be a little more frequent on hot days especially if the AC is on. I removed the IAC valve and cleaned it up. It was pretty gunky. I also just finished putting in a rebuilt transsmision last week (that was a job). It did it before and it still does it now, so the TC valve seems out. Could it be an air/fuel leak? I do seem to smell fuel occasionally. Or is it the IAC. I couldn't test it when I pulled it. I don't have a variable power supply. Or could it be the MAF? Any help is much appreciated!
The car in question stalls randomly. It also will have a rough idle occasionally. The rough idle does not seem instrumental in the stalling because it does not always idle roughly before it stalls. It doesn't seem to matter if the car is warm or cold, although, it does seem to be a little more frequent on hot days especially if the AC is on. I removed the IAC valve and cleaned it up. It was pretty gunky. I also just finished putting in a rebuilt transsmision last week (that was a job). It did it before and it still does it now, so the TC valve seems out. Could it be an air/fuel leak? I do seem to smell fuel occasionally. Or is it the IAC. I couldn't test it when I pulled it. I don't have a variable power supply. Or could it be the MAF? Any help is much appreciated!
Thread Starter
Audiworld Junior Member
Joined: Feb 2010
Posts: 13
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Oh, and it stalls whether it is in P,D, or N. Even if I hold my foot on the gas a little and keep it idling at 1000 or even 2000 it still stalls, however, it never stalls while driving, and it only stalls while at a complete stop. Never while stopping.
AudiWorld Super User
Joined: Sep 2003
Posts: 5,004
Likes: 129
From: Fremont, CA
Believe it or not, this will help and also check the vacuum hoses and wiring around the same area for cracks.
Spray plentiful carburetor cleaner to little holes and butterfly.
Cheers,
Louis
Spray plentiful carburetor cleaner to little holes and butterfly.
Cheers,
Louis
Thread Starter
Audiworld Junior Member
Joined: Feb 2010
Posts: 13
Likes: 0
Well, I pulled the intake off and cleaned up the throttle body. No luck. I found an exposed wire in the IAC harnessc bu t I just don't think that is the problem. Any other suggestions? Or, should I just order a new IAC?
AudiWorld Super User
Joined: Sep 2003
Posts: 5,004
Likes: 129
From: Fremont, CA
There must be a vacuum hose cracked somewhere on your engine. Check for diaphrams around the area which doesn't release after high engine speed to idle speed. Temperature sensors somewhere.
As I understand,
At idle,
the butterfly is closed, very little air going through the intake.
fuel injection air sensor will sense a littl flow of air and inject little gas accordingly.
If your car run smooth at high speed, then MAF is still good.
Check again all the black hoses around the throttle body and vacuum diaphrams around it for leaks or functionality.
It must be very easy to fix. Make sure all the clamps on the air ducts are tight.
This is how I fixed idle/stall problems many years ago on a my 190E
http://www.dognmonkey.com/audi/91-me...-problems.html
Good luck,
Louis
As I understand,
At idle,
the butterfly is closed, very little air going through the intake.
fuel injection air sensor will sense a littl flow of air and inject little gas accordingly.
If your car run smooth at high speed, then MAF is still good.
Check again all the black hoses around the throttle body and vacuum diaphrams around it for leaks or functionality.
It must be very easy to fix. Make sure all the clamps on the air ducts are tight.
This is how I fixed idle/stall problems many years ago on a my 190E
http://www.dognmonkey.com/audi/91-me...-problems.html
Good luck,
Louis
Last edited by ltooz_a6_a8_q7; Apr 18, 2012 at 12:38 AM.
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Joined: Jul 2007
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I had the exact same problem. the car would primarily stall when I would decelerate or come to a stop.
Check the three, larger breather hoses that connect to your valve covers. These are common failures (oil eats away at the rubber hoses) in the D2s and can be replaced with relatively easily. Completely fixed my problem.
Check the three, larger breather hoses that connect to your valve covers. These are common failures (oil eats away at the rubber hoses) in the D2s and can be replaced with relatively easily. Completely fixed my problem.