[s-cars] Pauls' problem (with car)

[Paul Krasusky]

-----Original Message-----
From: Calvin & Diana Craig [mailto:calvinlc at earthlink.net]
Sent: Thursday, December 12, 2002 9:49 PM
To: Paul Krasusky; 's-car-list'
Subject: RE: [s-cars] Pauls' problem (with car)


Paul,

You said it stumbled after it started.  I don't believe this is symptomatic
of a CPS since it is only used to start the car; once the car is started,
probably a threshold in code set by a set number of rpms, the crank position
sensor takes over and the cam position sensor is taken along for the ride.
At least this is the way it is coded in 99.9% of all the car ECU's I have
seen.  The motronic is probably the same.  The only way I can see the CPS
causing this is that it caught enough to get the car somewhat started but
the rpm's weren't over the threshold to stop looking at the CPS sensor and
it started going flaky again.  If your rpms were over 600-700 during the
stumbling event and the Motronic works the way I think it does, there is
almost (I'll never say never with Audis) no way it can be the CPS.

The stumbling, to me, indicates a fuel starvation problem.  Maybe fuel pump
or FPR.  I still stick by the fact that the first thing I would do is spend
$35 for the FPR and replace it.  Especially since your codes did not reveal
any CPS abnormal activity, which is very unlikely if it is the CPS.  You
could satrt with the Fuel pump or CPS, but both of those are going to be
about $100 in parts and hours of labor.  I always start with the easiest
(cheapest) and work from there.

--Calvin






Thanks Calvin-

Dumbass me figured out that the 1st code "Engine Speed Sensor" was thrown
during a "car off" reading.  ANYway, I forgot to include a prefix to the
other code yesterday, 00561 "Fuel Mixture Adjustment", 15-10 Adaptation
Limit not reached - intermittent

I also don't think CPS, as yesterday's 2 hot starts both did the
crank-nothing thing, for 2 successive attempts, then stuttered and stumbled
to life (once stumbles to life, it "runs" 100% fine).  And if I shut her
down and start her RIGHT back up, it's fine.  Feels / sounds like maybe
building fuel pressure.  Got a spare FPR, going to swap tomorrow and see.
Couldn't do it last few nights, what with it being Jen's bday and all.  Me
thinks that wouldn't have gone over too well...  even for me...

Thanks again.  Always something...

-P

P.S.  WRT '95 tank capacity (weeks ago), er, it CANNOT be more than 19.8...
ran it so low it was bucking and coasted to the pump...  that's all I could
squeeze in.  For the 2nd time now.  Yeah yeah I know, bad thing to do, don't
ask, long story.  But it AIN'T no 21-23 or whatever...