[s-cars] Hesitation -- please help

[Sean Douglas]

Adam:

I assume you have checked for codes? It could be a knock sensor going
bad, I had this same symptom in my 90q20v.

Sean

Sean Douglas
1997 Audi S6//RS2-spec
1990 Audi 90 quattro 20v


> -----Original Message-----
> From: s-car-list-bounces at audifans.com 
> [mailto:s-car-list-bounces at audifans.com] On Behalf Of Adam Cramer
> Sent: Wednesday, August 24, 2005 10:09 PM
> To: s-car-list at audifans.com
> Subject: [s-cars] Hesitation -- please help
> 
> 
> All-knowing S-car list,
>  Please, please help me figure out what is causing my 
> hesitation issues. 
>  I finally got around to testing my coils tonight. I thought 
> this would 
> solve my hesitation (under load) issues, but all 5 of my 
> coils seem to be 
> fine. I used the adjustable spark gap tester and each of the 
> coils made a 
> nice clean, crisp, blue spark about 3/4 - 1 inch long. I 
> couldn't find a 
> weak one among them. I really tried to tell myself that the 
> #3 coil was bad, 
> but everytime that I would re-test it, the spark would come 
> back nice and 
> crisp. ARGH!
>  Symptoms include hesitation under load, especially in the 
> higher gears (4th 
> and 5th), although occasionally I will feel the problem in 
> 2nd and 3rd. It's 
> not violent jerking like the fuel is being cutoff, but more of just a 
> hesitation and general lack of consistent, smooth power to redline. 
> 
> Here's a list of stuff that I have fixed/checked/replaced so far:
> 
> 5 new Spark Plugs (Bosch OEM)
> 2 new POS units
> New Fuel Filter (OEM)
> New Air Filter (OEM)
> Checked for air leaks
> Checked for weak coils
> Checked plug boots (good condition)
> 
> Anyone have any other ideas, either electrical or fuel 
> related? I think I've 
> tested all of the electrical options. What about the 
> alternator? Any chance 
> a weak alternator would be causing this? I did have an oil 
> leak a few months 
> ago that caused oil to accumulate on the alternator. 
>  More background on the car (if it helps you diagnose the 
> problem)......RS2 
> turbo, em, maf and injectors. IA chip. Forge BPV (yellow 
> spring). Another 
> issue with this car that I haven't been able to solve is that 
> the idle RPMs 
> fluctuate when warm. Usually between 800-1000. I doubt this 
> is related to 
> the hesitation issue, but I thought I would throw it out 
> there just in case.  Any help is appreciated.  Thanks, Adam
> 
> This is definitely a love/hate relationship. 
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