poor running 88 5ktqa - more info

[Livolsi, Stephane]

Thanks Ameer and all others who replied.  You've given me some great
ideas that I will be checking out tonight.  At lunch time I drove the
car and again for the first minute or so it actually accelerated like a
turbocharged Audi, then fell back into it's old tricks.  We will be
fixing the problem tonight and I'll let the list know what we found.

Stephane

> -----Original Message-----
> From: quattro-bounces at audifans.com 
> [mailto:quattro-bounces at audifans.com] On Behalf Of Ameer Antar
> Sent: March 31, 2004 1:04 PM
> To: Livolsi, Stephane
> Cc: Quattro List
> Subject: Re: poor running 88 5ktqa - more info
> 
> 
> I'd strongly suspect a vac. leak somewhere. I had a similar 
> issue before where the car would run ok fro a few miles and 
> then totally crap out the next. It turned out to be a hose 
> had fallen apart right next to the hose clamp so it was hard 
> to see. Every bum the car felt changed the position and 
> sealing of the hose, so the car would go from bad to worse 
> and back. Although it might be possible, esp. if several 
> sensors going bad, I doubt sensors would cause a severe 
> running issue as your stating. O2 sensors and temp sensors 
> only have a limited affect on the fuel delivery. The main 
> deciding factor is the air-flow plate and the rest is just 
> adjustments. If there's any sort of vac. leak, the plate will 
> not go high enough to deliver the right amount of fuel.
> 
> In any case, it's a really good idea to test sensors when 
> your troubleshooting so you can eliminate possible problems, 
> but I'd start to look carefully at all your intake hoses. 
> Carefully remove each one b/c cracks/tears usually don't 
> stare at you in the face... they usually hide on the bottom 
> or near a hose clamp. Who knows, the problem could be an ECU 
> malfunction, but you need to be sure you can eliminate 
> certain possibilites. good luck.
> 
> -Ameer
> 
> ----Original Message----
> Date: Wed, 31 Mar 2004 11:06:29 -0600
> From: "Livolsi, Stephane" <Stephane.Livolsi at investorsgroup.com>
> Subject: poor running 88 5ktqa - more info
> To: "Audi Quattro List" <quattro at audifans.com>
> Message-ID: <A9CCC2FEA3353D4B9BB3D1DC8939777004CC176B at igamail3.iga.bz>
> Content-Type: text/plain; charset=us-ascii
> 
> I copied my original post for reference.
> Last night I unplugged the o2 sensor and drove it.  Same 
> problem - cutting out/missing under acceleration - actually 
> felt worse which is probably good, right? meaning the o2 
> sensor is working?
>  
> Now this morning was interesting.....
> Slightly colder this morning (about 0C) and the car started 
> fine without giving it any throttle, but when I did give it 
> throttle it sounded like an air colled VW and there was some 
> (gulp) bluish smoke which cleared up
> (valves?)  Anyway, heading down the road the throttle felt 
> more responsive than yesterday and lo and behold I could 
> accelerate very nicely with heavy throttle application.  This 
> lasted for about 2 minutes and then the cutting out/missing returned.
>  
> So, what changes in the first couple of minutes of engine 
> operation?  O2 sensor is in open loop until it warms up but 
> it has the heater wire so it should only be a few seconds 
> before it goes to closed loop, right? What else is there?
>  
> I am strongly suspecting that temp sensor referred to in the 
> other posts for the 89 90Q.  Is it the a single wire sensor 
> at the upper rad hose on the engine, above the 4 wire MFTS?
>  
> Stephane
> 
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