[s-cars] //S4cylinder (still striking out) 1.8 coil mod.

[Jim Green]

On 1/26/06, AUDIJIM at aol.com <AUDIJIM at aol.com> wrote:
>
> Yesterday my friend Bob came over with his S6 Avant and we swapped
> complete
> coil pack assemblies. I removed mine and put it on his engine and we
> started it
> up and went for a drive. His car ran flawlessly, pulled like a freight
> train
> up to 7000 rpm and never failed. There was no reason to install his coil
> pack
> on my car after that. So this means that all my coils pack are good. This
> will
> also mean that I have a bigger problem on my car. Since it now confirms
> that
> I have everything testing good from the ECU to the POS's, the POS's, and
> now
> everything past the POS's, it will mean that I have a mechanical issue.
> So,
> with a compression test that tested good, a leak down test that tested
> good, fuel
> injector test/swap/wiring is good, ignition
> test/ECU/wiring/POS/coils/spark
> plug boots/spark plugs all tested good and/or replaced with new, I'm left
> with
> either valve train issues or piston/lower end issues. This weekend, I am
> going
> to (once again) pull the valve cover and cams, and lifters and inject
> compressed air into the cylinder to keep the valves from falling into the
> cylinder. I
> will then remove all the valve springs and see what I have going there.
> When
> I checked the springs when I installed the new lifters, I never took them
> all
> the way out to inspect, I only visually looked at them for major problems.
> If
> #4 cylinder valve springs check out OK, I will continue to drive the car
> until
> I finish rebuilding my other AAN. This nightmare isn't over yet, but I
> wanted
> to thanks everyone who has suggested anything related to my problem.
> Please
> keep your suggestions coming! If there is anything I have over looked,
> please
> feel free to chime in.
>

Jim, I know you checked the wiring from the ECU to the POS, but I'd still
run new wires if I were you, at least for cyl # 4.  Even if it's out the
front window and then under the hood for a test drive.  I bet you have
something going foul when there's heat or vibration introduced.

--
Jim Green
'89 90tq
'89 80q
http://www.mswanson.com/~jgreen/car_home.html