[s-cars] misfire

[Mihnea Cotet]

Björn, what does "megging" involve???

Thanks,

Mihnea

At 13:19 15/09/2003 +0200, Bjørn Ødegård wrote:
>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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