[s-cars] //S4cylinder (#4 cylinder misfire)

[Bob Frizzell]

Jim,
Have you really carefully checked the wires from the POS to the coils?  It
doesn't take much for them to short out.  Is there someone close by that you
could swap the whole harness with?  Possibly you have done this and I missed
it.
Best of luck, I'm impressed with what you've done to get to the bottom of
this.
Bob
93//S4, Edmonton
----- Original Message ----- 
From: <AUDIJIM at aol.com>
To: <bob at chips-ur-s.com>; <s-car-list at audifans.com>;
<Audi5TurboTech at yahoogroups.com>
Sent: Friday, January 20, 2006 6:20 PM
Subject: Re: [s-cars] //S4cylinder (#4 cylinder misfire)


> Bob,
>
> Starts on all 5 cylinders for about a second and a half, then drops #4
cyl. I
> can unplug #4 fuel injector and get no change in my bad idle. I tried
> swapping fuel injectors, no help. New coil pack at #4, no help. New POS,
no help. I
> thought it was a possible lifter, changed all 20 lifters and checked for
broken
> valve spring, no help and no broken valve springs. New plugs, new boots,
no
> help. New injector inserts, new O-rings, new fuel filter, no help. Tried
> swapping ECU's, no help. Compression test good. Leak down test good. The
only thing
> I haven't checked is the wiring to the POS from the ECU. That's tomorrow.
> After the engine runs for a while, it will smooth out and idle sort of
nice. If I
> blip the throttle, it will loose #4 again and then recover. At highway
speeds,
> you can feel the engine running a little rough and full power isn't there.
> Sometimes it runs well at highway speeds and pulls like a freight train,
but
> after I let off, I can feel that it lost the cylinder again.
>
> Jim
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