[s-cars] misfire

[Bjørn Ødegård]

After all the threads and posts regading damaged PSO's and coils, it
seems that a bad coil often kills a PSO output, and if you don't check
the coils, you might as well kill another output.. So, check the coils
thoroughly before using the 'spare' output stage! To check it, a
'megger' is invaluable, as the hairline cracks in the insulation lacquer
almost never shows up at ordinary insulation tests. (Cons: Beware of
possible sparks when megging, and disconnect everyting from the car!..
;o))

Bjorn  :o)
'92 S4 MTM


----- Original Message -----
From: "Mihnea Cotet" <mik at info.fundp.ac.be>
To: "Philip Mische" <pmische at comcast.net>; "S-Car List"
<s-car-list at audifans.com>
Sent: Sunday, September 14, 2003 8:31 PM
Subject: Re: [s-cars] misfire


> Philip, are the spark plug "wires" fine? Sounds like either a wire or
a bad
> coil to me....
>
> HTH,
>
> Mihnea
>
> At 14:10 14/09/2003 -0400, Philip Mische wrote:
> >This is a multi-part message in MIME format.
> >--
> >[ Picked text/plain from multipart/alternative ]
> >I've got a problem with my 95.5 S6.  Here's the setup:
> >   a.. In Feb I had a POS channel go bad.  I swapped over the wires
to use
> > the spare channel and things were fine.
> >   b.. A few weeks later came another misfire.  When I went to
diagnose it
> > the motor went back to hitting on all 5 again, so I couldn't figure
which
> > cylinder had the problem.  I figured I was losing another POS
channel, so
> > I bought a new one from a lister.
> >   c.. Over the past few months the misfire would pop up again, then
> > quickly disappear, usually after I turned the car off and then
started it
> > back up again.  Like running a Microsoft based car.
> >   d.. Yesterday the misfire came, but this time it didn't leave.
Using
> > the remove-the-fuel-injector-plug method I determined it was #4.
That
> > made sense, since the POS for #4 was the one that had the bad
channel
> > from Feb.  I found the new POS I'd purchased months ago and popped
it in,
> > and guess what?  No change!  I swapped out the other POS just to be
sure,
> > again no change.  Darn.
> >   e.. Checked the spark plugs, they were all tight.  I changed the
#4
> > spark plug and the miss was still there.
> >Soooo, what's the next likely place to look?
> >
> >Thanks in advance,
> >
> >Phil
> >--
> >
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>
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>



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