[s-cars] What to rule out before CPS (was fuel pressure tester porton AAN?)

Thu Apr 26 20:53:36 EDT 2007

Vincent,

Check your fuel pressure, it may be bleeding down. I had some similar issues 
a few years ago.
In my case, the check valve at the fuel pump had become clogged and did not 
seat well.
This would let the fuel pressure run back to the tank and would result in 
very hard start.
I disconnected the line (pressure) back to the tank and blew some air into 
the line, that cleared whatever had blocked it.
Since then I have always had a pressure gauge located at the front of the 
fuel rail. This eliminates fuel problems very fast.
Since then I have also replaced the fool pump, this may have been an early 
warning. I dunno.

Mark
----- Original Message ----- 
From: "Vincent Frégeac" <s.sikss at gmail.com>
To: "'chris chambers'" <fastscirocco_2000 at yahoo.com>; "'Scar'" 
<s-car-list at audifans.com>
Sent: Thursday, April 26, 2007 8:33 PM
Subject: [s-cars] What to rule out before CPS (was fuel pressure tester 
porton AAN?)

So my S-Bitch could have a slowly failing CPS. I'm still reluctant to change
it just to see for two reasons:
- The warm start problem started back in September last year then
disappeared because the temperature cooled down. So the CPS would have been
slowly failing for 8 months now. A bit long from what I've read on the list.
- The S-Bitch have a long history of making me R&R expensive parts to then
discover the problem was a very simple and cheap one to fix. I know this
argument is totally irrational but I'm as rational then this argument when
it comes to the S-Bitch.

Now, there is still an argument in favor of the CPS. The S-bitch is an old
lady with 198Kmiles and CPS untouched since 70Kmiles when I bought her.

So before I unbury my wallet, is there anything else that I should rule out
before replacing the CPS? Symptom is S-Bitch doesn't want to start within 20
minutes after shut off when I've run at least half an hour on the highway
with outside temperature above 60F. Then it start as usual with a somewhat
uneven idling rpm sounding like a sticky ISV for a few seconds. Any other
time, highway below 60F, or less than 30 min. on highway, or city/country
road driving, it starts fine but requires a few revolutions (3-5 rev.)
before I hear the first spark plug firing gas.

Any idea?

Vincent.

-----Message d'origine-----
De : chris chambers [mailto:fastscirocco_2000 at yahoo.com]
Envoyé : 26 avril 2007 13:39
À : Vincent Frégeac; Scar
Objet : Re: [s-cars] Fuel pressure tester port on AAN?

Vincent,

It can't be a vapor lock, with the fuel injection system it can't
vapor lock.

It sounds like an intermittent CPS. When the CPS fails the car
will run but won't start. I had this same problem 2 years ago, when
the car got warm it wouldn't restart, happened a few times and then
the CPS failed completely.

If your car has any amount of miles on it and hasn't had the CPS
replaced I'd look there. Unfortunately there is no way to test the
CPS other than replacing it.

HTH good luck
Chris

--- Vincent Frégeac <s.sikss at gmail.com> wrote:

> Hi,
>
> The S-Bitch has developed a annoying new behavior that looks like
> vapor
> lock, FPR or injector leak: she doesn't want to start again after a
> long
> stretch on the highway until you wait 15-30 min. depending the
> temperature
> outside.
>
> I found a fuel pressure tester on the net but doen't know if it will
> work on
> our fuel rail. It's said to have adapters for Chrisler, Ford, GM (who
> cares?) and Bosch AFC but not Bosch CIS. IIRC, the CIS is the system
> used in
> the 80s on Audis, but what is the connection for the fuel pressure
> test if
> any on the AAN?
>
>
>
> Vincent
>
> -----Message d'origine-----
> De : s-car-list-bounces at audifans.com
> [mailto:s-car-list-bounces at audifans.com] De la part de
> pkrasusky at ups.com
> Envoyé : 25 avril 2007 14:23
> À : s-car-list at audifans.com
> Objet : [s-cars] NAC: trio comparo tittihardonarrro
>
>
> Take 5 minutes and crank up the sound.  It unfortunately
> conspicuously does
> NOT include ME nor any JNR (tho my kids *did* violate the interior of
> the
> one from which I now don an ashtray).
>
> One of them induced sacshrinkage and resplendent gigglage here at the
> 1-2 upshift - you decide which.  YEOWSERS!
>
>
http://www.dpccars.com/car-videos/04-22-07page-Maserati-MC12-Porsche-Carrera
> -GT-Mercedes-McLaren-SLR.htm
>
> -Paul boingoingoingoingoingoingoingoing - hey - it's not an Audi! K.
>
>
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Make April 15th just another day http://www.fairtax.org

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