[s-cars] taking my turn

[James Murray (LMC)]

Could be the PSO, but more likely a bad coil... If it runs fine once it warms up it's probably a bad coil rather than a bad PSO, a bad PSO will likely stay bad (i.e. once the channel goes it stays gone...) but a coil can slowly fail, when cold the coil isn't making a good electrical connection, as the car warms up it makes a better contact and the car seems to run smoother, you may notice a flutter under heavy boost however like Hap is at the moment. A failing coil will not have the same resistance characteristics of the others, if you have the means to check, it's worth checking all of them.

Either way, the 1st test Gary describes is the easiest way to determine which cylinder is causing the miss. The PSO test will also rule that out item out to be sure. More indepth write up available here: http://www.sjmautotechnik.com/S4_Ignition.htm

Cheers, /J.

-----Original Message-----
From: Martin, Gary G [mailto:MartinGG at aetna.com]
Sent: Friday, February 21, 2003 12:27 AM
To: AUDI S Cars Discussion List
Subject: RE: [s-cars] taking my turn


Could be PSO. I believe this test could help. If it misses at idle, pull one
injector electrical connector at a time. When the idle doesn't get worse,
that is the cylinder missing. Then swap power stages, repeat the test and if
the bad cylinder moves, it is the PSO. I had  one go bad, but never did this
test because it was very intermittent. Luckily, a lister lent me a good PSO
to test with.

Gary

-----Original Message-----
From: Philip Mische [mailto:pmische at comcast.net]
Sent: Thursday, February 20, 2003 6:00 PM
To: S-Car List
Subject: [s-cars] taking my turn



95.5 S6.  Chipped, runs fine.  Turn off the car.  One hour later I fire it
up and not everyone fires up - it acts like it's got a fouled plug.  It's
very unhappy, and so am I.

1) Is this how a bad POS behaves?

Phil Mische
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