long starts fuel pump check valve

[Alan Kramer]

Here's my initial reaction to the problem described below:

1)  Check that the air sensor plate is not binding.  Remove all the control 
pressure first by running the CSV (car off) and the plate should move very 
freely upwards w/ a small magnet.  This should only take a few minutes and 
isn't a big deal to do.  If it even gently scrapes one of the walls in the 
first few mm of travel this might be your problem.

2)  The fact that the problem can be remedied with the CSV squirting might 
be pointing toward a control pressure problem - it's too high.  This 
restricts plate movement and makes the car very hard to start.  If you have 
CIS then replace or clean the control pressure regulator on the side of the 
block as well as all electrical contacts to it.   If you have CIS-E or 
CIS-E3 then replace the CPR on the side of the fuel dizzy (grey box thing) 
and clean all electrical connectors.  I've found that attempting to clean 
these doesn't work.

Anyway, that's what I'd try.  It doesn't require anything special (i.e. fuel 
press guage) just an extra CPR for #2 - which can be found at any junkyard.

I also take it you've double and triple checked all the vac. hoses.  I had a 
bugger of a vac leak at one of the 4 hoses that come together under the big 
black air hose.  Difficult to find 'cause it was so buried.  Caused a 
hard-start condition as well.

HTH,
Alan




>From: "Livolsi, Stephane" <Stephane.Livolsi at investorsgroup.com>
>To: "'Audi Quattro List'" <quattro at audifans.com>
>Subject: RE: long starts fuel pump check valve
>Date: Wed, 25 Oct 2000 13:14:18 -0500
>
>Or it could be something different altogether.  In my actual experience
>I was having a hot start problem which gradually became a cold start
>problem as well.  In order to 'test' to see if my fuel system was
>leaking down, I hot wired my fuel pump so that I could turn it on
>independently of the ignition switch (once the car was running, I would
>turn the switch off so the safety features were still active)  but this
>allowed me to run the fuel pump for 1, 2, 5, 10, 15 minutes before
>trying to start.  If the prob was my check valve, then one would expect
>that having the fuel pump running for a few minutes before starting
>should fix the problem.  The net result for me was nil.  Running the
>fuel pump to pressurize the system prior to starting did not help.  I
>also checked the other end for wet cylinders and they were dry as a
>bone.  The only way to get the car going was to hotwire the cold start
>valve to inject some fuel that way, and after it was running (roughly),
>then the fuel would start to flow to the injectors.  This leads me to
>believe the prob is the fuel distributor and I just haven't had enough
>time to learn about it so that I can feel comfortable tackling it.
>
> >----------
> >From: 	james accordino[SMTP:ssgacc at yahoo.com]
> >Sent: 	October 25, 2000 6:23 AM
> >To: 	audi list
> >Subject: 	Re: long starts fuel pump check valve
> >
> >
> >--- Stephen Bigelow <sbigelow at sprint.ca> wrote:
> >> The check valve is a _whole_ lot cheaper to swap out
> >> than a set of
> >> injectors.
> >
> >Or try a quick diagnosis.  If it cranks because
> >there's too MUCH fuel in combustion chambers, most
> >likely injector leak-down.  No?  If OTOH it's because
> >it's waiting for the fuel system to repressurize, then
> >I would suspect check valve.  On my 200, I could
> >see/smell the fuel in some cylinders, and you could
> >certainly tell at the tailpipe.
> >
> >My $.02
> >Jim Accordino
> >

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