Audi 100 2.6 running problem

hunker7 · 13-11-12, 08:13 AM

Hi. I have a problem with my 1993 Audi. When it's cold and when driving around town, when I take my foot off the throttle car is still going for about 3 seconds, but on motorway everything is fine. I checked for leaks around inlet manifold and vacuum system seems to be in order too, and another thing is at some point when engine is cold RPM will jump between 1100rpm and 1200rpm for some time and then stop. I just have no idea what it can be. Maybe someone can help me with that? Thanks in advance.

EDIT : Engine code is ABC.

Ben · 13-11-12, 07:19 PM

Have you tried cleaning out the idle stabilizer valve with WD40? : http://www.12v.org/engine/index.php?...n=cl&view=rear

hunker7 · 13-11-12, 10:08 PM

Quote:

Originally Posted by Ben

Have you tried cleaning out the idle stabilizer valve with WD40? : http://www.12v.org/engine/index.php?...n=cl&view=rear

No I have not. Thanks for advice, will do that for sure, and update on what is happening.

hunker7 · 14-02-13, 07:40 PM

I did clean it, but nothing changed. Bought a new one, still, no luck!

Audiden · 14-02-13, 08:36 PM

Is it manual or automatic?

BIGGYIN · 14-02-13, 08:42 PM

Temp sender that controls,the ISV?
I swopped(and cleaned) my ISV three times and no changed.Renewed temp sender and fixed the problem.

hunker7 · 14-02-13, 10:09 PM

Quote:

Originally Posted by Audiden

Is it manual or automatic?

Manual

Quote:

Originally Posted by BIGGYIN

Temp sender that controls,the ISV?
I swopped(and cleaned) my ISV three times and no changed.Renewed temp sender and fixed the problem.

Yes, I have been thinking about checking temprature sensor. According to AutoData there has to be certain resistance between connectors at certain temprature. Can I just dip it in water and check resistance? Will it not damage it?

Cuppatea · 14-02-13, 10:41 PM

Make sure the throttle cable is nice and free and not over adjusted.

Check/clean throttle butterflies).

And finally operation of 'closed throttle' switch.

BIGGYIN · 14-02-13, 10:51 PM

The temp sender for my KV engine was,about £6 from GSF.
Easy enough,job.

hunker7 · 14-02-13, 10:51 PM

Quote:

Originally Posted by Cuppatea

Make sure the throttle cable is nice and free and not over adjusted. Clean isv as mentioned, check/clean throttle butterfly(s). And finally operation of 'closed throttle' switch.

Checked throttle body cable and cleaned throttle body. If ISV is idle valve then I changed that.
What do you mean by operation of closed throttle switch?

13-11-12, 07:19 PM	#2
Ben 4 ring whore! Classic Audi Club Member Join Date: Mar 2008 Location: Stockport Posts: 2,348	Have you tried cleaning out the idle stabilizer valve with WD40? : http://www.12v.org/engine/index.php?...n=cl&view=rear __________________ 1992 80 quattro 20vt

14-02-13, 08:36 PM	#5
Audiden Senior Member Classic Audi Club Member Join Date: Aug 2008 Location: Scotland Posts: 1,257	Is it manual or automatic? __________________ Too many cars!!

14-02-13, 08:42 PM	#6
BIGGYIN 4 ring whore! Classic Audi Club Member Join Date: Mar 2009 Location: Merseyside Posts: 7,976	Might be worth,trying? Temp sender that controls,the ISV? I swopped(and cleaned) my ISV three times and no changed.Renewed temp sender and fixed the problem. __________________ q90 B2 Type 85 - q90 B2 Type 85-PROJECT-ABY 20vt KARL. Injection is nice but I'd rather be blown

14-02-13, 10:51 PM	#9
BIGGYIN 4 ring whore! Classic Audi Club Member Join Date: Mar 2009 Location: Merseyside Posts: 7,976	Don't know the cost of yours? The temp sender for my KV engine was,about £6 from GSF. Easy enough,job. __________________ q90 B2 Type 85 - q90 B2 Type 85-PROJECT-ABY 20vt KARL. Injection is nice but I'd rather be blown

14-02-13, 07:40 PM	#4
hunker7 Grown up member Classic Audi Club Member Join Date: Nov 2012 Location: Leeds, London Posts: 449	I did clean it, but nothing changed. Bought a new one, still, no luck!

14-02-13, 10:41 PM	#8
Cuppatea Grown up member Join Date: Feb 2011 Location: Somerset Posts: 105	Make sure the throttle cable is nice and free and not over adjusted. Check/clean throttle butterflies). And finally operation of 'closed throttle' switch.