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Subject: 1990 V8 Quattro Idle Problem too
I've been having exactly the same symptoms on my 87 5kcst. In my case
it is after a cold start and it will take about 30 seconds of running
with accelerator held down before it will idle properly. After
unsuccessfully looking for a vacuum leak I took it to the dealer with
instructions to fix it. They failed on the first try, cranked up the
mixture, so I took it back. They report that the connector contacts
were corroded on a temperature sensor and cleaning the contacts has
fixed the problem. I'll be picking the car up later today and will find
which temp sensor it was and whether it really is fixed.
I know this is a different engine and different injection system but
yours probably uses a temperature sensor for mixture control just as
>Date: Tue, 11 Nov 1997 13:18:19 -0700
>Subject: 1990 V8 Quattro Idle Problem too
>I guess I've been to late catching up on the Idle problem e-mails, so I
>hope someone can catch me up!
>My 90 V8 has the same sort of issue, but only when first starting the
>I haven't been able to pin it down to whether the car is cold or hot.
>What happens is that after turning the key, the engine lights up, revs
>to 1000+ rpm (like normal), idle comes down, and I guess some idle
>adjustment motor is trying to recover the idle but doesn't do it fast
>enough and the car dies. I sometime have to restart the car a
>times before the car stays on.
>The funny thing is that I can hold down the accelerator after starting
>and keep the car on, but as soon as I lift my foot off the gas pedal,
>dies 'cause it didn't raise the idle up quick enough.