[Author Prev][Author Next][Thread Prev][Thread Next][Author Index][Thread Index]
RE: Audi 5000 Fuel Distributor
Thanks for the advice. I agree.
Now some more background info... At the time, I was 400 miles from
home, without time, without tools, with wife and two small children, and
with a vehicle that would barely run from a stop. Had to drive it
anyway - had little choice at that juncture. (Fully intended to explore
all relevant components in detail once I got home - I figured I was in
for a new injector or fuel distributor, and soon.) Whew. ;-)
I wasn't TOO worried about high EGT, as problem disappeared at cruising
speeds. Only seemed to affect initial acceleration/spray onset from
To reiterate Steve - anyone with similar symptoms should check things
out as soon as possible. Especially if you don't, and they persist.
> Sent: Wednesday, December 3, 1997 3:21 PM
> To: email@example.com
> Subject: RE: Audi 5000 Fuel Distributor
> # I developed the exact same symptoms last week with my '88 5kcsqw.
> # Figuring it was either the fuel distributor valve or a fouled
> # I ran two tanks with injector cleaner added to see if I might get
> # and avoid replacement of the offending part. After about 200
> miles, the
> # problem had diminished to nothing. This chilly morning, a few days
> # later, a slight miss returned - but disappeared again as the car
> # up.
> # I suspect I've got an injector that was sticking in the closed
> # I am leaning toward this as an explanation, because the engine felt
> # like there was a distinct cylinder miss than a more general lean
> # from a sticky distributor valve. We'll see how it does after a few
> # months... maybe a good cleaning will manage the problem.
> ... you really need to be careful not to be "penny wise and pound
> when you do things like this. If you have a cylinder that is running
> due to a malfunction of the FD or injector your EGT can get much
> than nominal. This may result in burned valves if it goes on for too
> I suppose that if the injector were completely plugged you wouldn't
> have a
> problem as you'd simply be pumping air ...
> I'd recommend that anyone that thinks they have an injector problem
> the injectors and check the spray patterns rather than running a
> of Techron and crossing your fingers. It really isn't that difficult
> pull the injectors out to check them ... and that would also give you
> chance to see what shape the seals are in ...
> ... to the original poster ... if you have a problem that develops as
> engine warms up it may in fact be due to the ECU trying to lean out
> mixture when it goes closed loop. Too bad the car doesn't have an EGR
> valve ... the symptoms fit pretty closely to that. :) Here I'd
> that you get a fuel pressure gauge and a duty cycle meter and check
> and control pressure as well as the "OXS duty cycle." Another
> you might want to look for is an intermittent vacuum leak ... and the
> didate I'm thinking about is that stupid hose that runs up the spark
> side of the engine and connects the crankcase to the "PCV" system. I
> rently have that silly thing covered with duct tape on the '88 5kCSQW
> Steve Buchholz
> San Jose, CA (USA)