[s-cars] Troubleshoot a no start issue

[Andreas Schneider]

I'm a little late to the thread but have you tried to see if the vacuum idle maintaining device is jammed?
I had a similar problem. If I pinched the air hose entering the vacuum valve about 90% while starting the car it would run no problem, if I let go it would die immediately.
I took it apart and soaked it in brake fluid until all the carbon build up was gone and it would rotate properly again.
Re-installed and presto, I'm driving again. I saw you did alot of in-depth testing, maybe it is something simple.
Hope this doesn't seem like a dumbass thing to try.
Andreas

----- Original Message ----
From: "calvinlc at earthlink.net" <calvinlc at earthlink.net>
To: Brooke Fairbanks <bfairbanks at fnbbarron.com>; s-car-list at audifans.com
Sent: Monday, June 9, 2008 11:54:18 PM
Subject: Re: [s-cars] Troubleshoot a no start issue

Man, I feel for you Brooke.  We have all been there at one time or another.
I agree with the others that it is time to start looking into the spark in a
more in depth way.  You could start by looking at the input to the POS
stages and see if you have pulses coming in.  Preferable to use an O-scope,
but if you put a DVM on there you should at least see some periodic
fluctuations in the readings when you are cranking the car.  You could also
take the coil packs out and connect the spark plugs, remembering you will
have to somehow ground the outer part of the plug that normally bolts into
the cylinder head.  You should be able to see and hear the sparking
occurring.  If that's not there then track down where the signal first falls
apart from the ECU forward.  Also check that the electrical injector signal
is actually getting there as well.  You might even be able to use a "test
light" for those.
--Calvin



-----Original Message-----
From: s-car-list-bounces at audifans.com
[mailto:s-car-list-bounces at audifans.com]On Behalf Of Brooke Fairbanks
Sent: Monday, June 09, 2008 7:05 AM
To: s-car-list at audifans.com
Subject: [s-cars] Troubleshoot a no start issue


This is the synopsis of my no start struggles:



*        With a half tank of fuel and driving the 95 S6 w/ 129K miles, the
engine hesitates/stumbles then dies.  It refires, but runs poorly then dies.

*        With the car towed back home, I swap the crank speed sensors from
my other S6 and still a no start condition.

*        Compression is high of 135 and a low of 125 across the cylinders.

*        I verified that the speed sensor pin is still on the flywheel.

*        I swap out the old POS units with known to be working POS units and
still a no start condition.

*        I swap out the old coils with a 034 ignition loom with 5 new 1.8t
coils and still a no start condition.

*        I by-passed the fuel pump relay to check the fuel pump function and
it appears to pump fine from the filter line (I did not measure the exact
volume or measure from the fuel pressure regulator or the injectors)  I
checked to make certain it was fuel, not fuel/water coming from the tank.

*        I spliced in a CPS and still a no start condition.

*        I replace the fuel filter, spark plugs, crank seal, cam seal, TB,
serp belt, serp tensioner bearing, H2O pump, T-stat, triple checked the
timing marks

*        Replaced the fuel pressure regulator

*        Removed the fuel pump basket to clean the screen (very small amount
of tiny debris)

*        Replaced the fuel pump

*        Checked the fuel to the fuel rail (gobs of pressure spray)

*        The motor fires very intermittently but still does not start



Any other suggestions?



Thanks!



Brooke Fairbanks

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