[s-cars] Bad POS?

[Jerry Scott]

Before you go blaming the POS try this, as it worked for me.  Remove the 
coil cover. Remove each coil and clean the white ash deposit that build 
up on the grounded coils, under the four bolts.  Also clean the single 
ground lead that attaches near the back of the cover.  If this does not 
fix the misfire, change the rubber plug boot for that cylinder.
Jerry

The Gagnons wrote:

>Hello,
>
>I was driving my wife's 92 S4 today and noticed that it developed a bad
>misfire while going through Portland, ME on Rt 295 at about 60 mph.  The
>misfire only lasted about a 1/2 mile and then went away.  After a quick stop
>at LL Bean, the car started misfiring from the get-go.  We stopped at Mickie
>D's ( just around the corner) for some food for my son and I was able to
>determine that it was the #3 cylinder that was misfiring by pulling the
>injector leads one at a time.  I suspected the POS so I checked the
>connections and it came out of it as soon as I restarted the car.  We
>continued to Bath (about 15 miles north) to visit some friends and upon
>restarting it was misfiring again.  We drove about 3 miles this way and it
>again stopped misfiring and was fine all the way home (about 60 miles).
>
>When I got home, I looked up the POS write up on SMJ's website and
>determined that I was lucky enough to have the # 3 channel go bad and
>swapping the right POS with the left would put the bad channel to the unused
>position.
>
>I really hope that is all It was, but am not sure.  My wife is driving 200
>miles to MA and back on Tuesday and would like to know if there is any other
>possibilities before sending her on her way.
>
>Any Ideas or feedback?
>
>Thanks
>
>Jack
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