Re: 90 Coupe Quattro - Bad ECU

[Andrew Duane USG/PE <duane@zk3.dec.com>]

Hairy green toads from Mars made JRheeman@aol.com say:

> Hello fellow quattro owners,
> 
> I've been enjoying this list for quite some time now.  Fortunately for me, I
> haven't had any real problems with my 90 CQ until recently.  My car had been
> stalling whenever I coasted to a stop.  I saw that some other people were
> experiencing similar problems.  There was much discussion about a bad or
> dirty ISV.  So, I took mine apart and cleaned it per some listers'
> suggestions.  Since then, the car has been stalling even more frequently and
> it is definitely running very rich.  I took it to a mechanic I trust and he
> did what he could, but he doesn't have the equipment to diagnose the problem.
>  He did find a vacuum leak.  The idle had also been searching, but this has
> now subsided.  However, the idle is now running high and it fights me under
> braking when the engine is around 1200-1300 rpms.

Is your coupe the 20V engine?

Angela's '90 90Q20V has been doing this a lot recently, too. New
plugs failed to have any effect.

I think it's a fuel problem. Maybe a leaky/stuck pressure accumulator
that won't keep accurate pressure to the injectors.  I'm also thinking
of some related things, like the fuel filter, primary pump (although
it isn't making any noise), etc.

Bentley's has some diagnostics for this, I'm going to see what it
has to say to look at.

-- 

Andrew L. Duane (JOT-7)			duane@zk3.dec.com
Digital Equipment Corporation		(603)-881-1294
110 Spit Brook Road
M/S ZKO3-3/U14
Nashua, NH    03062-2698

Only my cat shares my opinions, and she's too heavy to care.