ignition problems (i think) somebody please help!!!!
audi at humanspeakers.com
Wed Dec 17 13:51:17 PST 2008
(Please keep replies on the list)
Have you checked the timing - cam vs crank?
Plug wire condition?
Ground wires at intake manifold?
The so-called "spare" fuse(s) in the side of the fusebox, that supply
the CIS system?
Check the cat for broken guts.
Check all "vacuum" lines for leaks.
donald grady wrote:
> i've tried 3 different fuel meters, new fuel filter, swapped the coil,
> plugs,timing belt(it was nasty when i checked it),rotor button, coil
> wire.the idle switch is working. the distributor is still factory set
> with the cover over the bolt. i even checked the dist. shaft for play,
> but none.i,m out of idea's.a 20v is going in this spring....may have to
> be sooner but i'd like to avoid it, nasty time of year to be without wheels.
> > Date: Wed, 17 Dec 2008 16:06:18 -0500
> > From: audi at humanspeakers.com
> > To: audilvr at hotmail.com
> > CC: quattro at audifans.com
> > Subject: Re: ignition problems (i think) somebody please help!!!!
> > 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
> > timing?
> > > 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.
> > --
> > Huw Powell
> > http://www.humanspeakers.com/audi
> > http://www.humanthoughts.org/
> Win a trip with your 3 best buddies. Enter today.
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