ignition problems (i think) somebody please help!!!!
audi at humanspeakers.com
Wed Dec 17 13:06:18 PST 2008
3k is an odd place for the cutout - around 5k is typical of a 4 cyl fuel
pump relay, around 1500-1800 is typical of a "stuck closed" idle switch
(which you might want to test to make sure it's working).
One thought I have is that you might have a dead spot on the
potentiometer on the side of the air/fuel box. It's hard to get to on
the type 89, being "under" the edge of the fender. To check it you need
to put a meter on it (two different ways) and slowly raise the air flap
through its range of motion.
Only problem with that theory is it's not rpm-related really, it's more
related to pedal position/air demand.
One thing in its "favor" is that some of the trip computer functions use
the pot signal (fuel economy readouts, mostly).
What have you replaced or tested so far? Have you checked the ignition
> i'm driveng an '88 90 quattro 5 cyl.this problem has been escalating
> for a while and now the car is not driveable. it started out that the
> engie will cut out at 3000 rpm kind of like a rev limiter.i found if
> the fuel meter on the front of the cis fuel meter is unplugged, the
> car will run fine...but the onboard computer goes to all zero's when
> 3000 is reached. i've tried swapping just about everything i can
> think of but i can't finnd the problem and now tthe car won't idle or
> run properly. it surges stalls and backfires(blew the side out of the
> muffler when it backfired).i'm at a loss and running in circles.if
> anyone thinks they can help, please do.
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