ignition problems (i think) somebody please help!!!!

[Huw Powell]

(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. 
> <http://www.messengerbuddies.ca/?ocid=BUDDYOMATICENCA19>

-- 
Huw Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/