[XfireZ51]

Neat,

Thx for the advice. However, I have an epilogue to this story. I began tuning the ?new? motor and everything appeared fine, but then I started recording knock again. Sort of ready to tear whatever hair I have left. Put new plugs in and #2 appeared to NOT be firing or running extremely lean. The datalogs showed a lean condition just a 1-2 frames before Knock Retard was activated by the ECM. Sometimes, quite a lot of it. So I started w the more easily replaced items.
1. I did fuel pumps which apparently were originally in the car when I bought it 10 years ago. No change.

2. Replaced right side O2, which was showing very lean readings, sometimes for quite a few frames while the left side appeared normally swinging. No change.

3. Poured in a can of injector cleaner. No real change altho it can?t hurt.

4. Finally, I decided to do the plenum pull which I was trying to avoid, to check on
the #2 injectors.

In the course of doing the plenum pull, I decided to check primary and secondary coil windings on the bench, especially since I had gotten a higher ohm reading for the #2/3 coil when testing from plug end to plug end. However, it was still within spec <20k ohms. The other coils tested at ~14k, while 2/3 tested @~ 17k.

Close inspection of the coils revealed cracks in the casings of 3 of the 4 coils, including #2/3. Carbon tracks were visible on the body of the coil.

New coils are in and ready to pop plenum on today. 🤞

Just a side note to the Registry. It really doesn?t make sense that altho I am not a registry member, I can?t even expand the pics to the content that I myself provide. Just sayin!