I bet, bad PSO...was RE: [s-cars] (no subject)

[Eugene Yen]

Randy,
I agree with Gary-- the PSO is a likely culprit.  My UrS6 had similar
symptoms when the PSO failed.

If you need the procedure for diagnosing the problem, Scott Mockry (SJM
Autotechnik) has an exquisitely detailed writeup on his website:

http://www.sjmautotechnik.com/S4_Ignition.htm

If it turns out that you need a new PSO, Scott sells them for a shade
under $200.  I purchased one from him last month.

HTH,
Eugene








At 07:15 PM 4/29/2003 -0400, Martin, Gary G wrote:


>My money is on a bad PSO. When mine failed, it was intermittent just
>like you describe. Because it was so, they only way I could verify was
>to borrow a PSO and swap it in to find the fault. Bad news is they
>aren't cheap...about $300 IIRC. If it is not intetrmittent, then you
can
>fix it with the spare channel that I think some lister offered info
on.
>Each PSO has 3 channels.
>
>Gary
>
>-----Original Message-----
>From: Randy Carver [mailto:rmcarver at wwdb.org]
>Sent: Tuesday, April 29, 2003 2:16 AM
>To: s-car-list at audifans.com
>Subject: [s-cars] (no subject)
>
>
>This is a multi-part message in MIME format.
>--
>[ Picked text/plain from multipart/alternative ]
>Hello!
>
>This is a general question to everyone:
>My 1994 S4 has about 109k miles on it and the engine has just recently
>developed a problem.  It seems to be running very rough, like it is
not
>getting enough fuel.  This problem is intermittent, and I cannot
detect
>any pattern whatsoever.  It happens when it is cold, hot, idling, or
on
>the freeway.  One minute it seems to be running great, and then out of
>nowhere it happens.   When this problem occurs, the car is very
>reluctant to accelerate, but acceleration can be accomplished - just
not
>to normal S4 standards.  When this happens on the freeway, for
example,
>I can let off the throttle and the vibrations decrease, but not all
the
>way. Then when I throttle it again, the vibrations are at their worst.
>When it happens while idling the car shakes a little.  I originally
>detected this about a 1000 miles ago, and it has been steadily
worsened
>ever since.
>
>Could the problem be in the fuel injection system?  What would make
this
>problem occur so irregularly?  If a hose was blown, wouldn't the
problem
>occur 100% of the time?  By the way - this car has not been modified,
>and is totally stock.
>
>I have checked every plug and hose/tube for disconnects or leaks, but
>found nothing.  I also found no evidence of any leakage on my engine.
>Last weekend I discovered that the spark plugs were not torqued down
>properly, but that was not where the problem lied.  I also replaced
the
>fuel filter and the air filter last week. Any opinions welcome.  Thank
>you very much!
>
>Randy Carver
>425-337-4467 office
>425-864-5033 cell
>--
>
>_______________________________________________



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