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Good thinking, NCDiesel, but for the 4ZE1, crank position reads off the dizzy, with an optical shutter. Not sure how that could slip?


Thanks. I was thinking along the lines of the signal from the distributor being different, not really a slip in the module/sensor in the distributor.

In other words, the ECM is getting told one thing about engine speed, but because the dizzy module is slightly different than what came with the vehicle, engine speed is really something else and timing is off because of it.

Again, not sure if this makes sense for this particular engine.

NCDiesel