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Someday I'll learn how to read! Since the temp switch checks out, how about the throttle switch?
To help answer your questions...
1. "Could a bad O2/rich mixture/something-like-that cause the Fuel ECU to tell the Ignition ECU to advance the timing? I've read that the Coolant Temperature Sensor, connected to the Fuel ECU, will tell the ignition to advance based on cold coolant temperatures. Is the O2 system that smart too? "
I was not aware that the LH 2.2 coolant temp sensor had anything to do with the ignition pulses from the EZ117K, but we both know the rad. switch does. The EZ117K does get a "load" signal from the LH 2.2 pin 24 into pin 8 on the EZK, but I think this comes from the AMM. The EZK will also tell the LH when a knock has been detected, so the LH can increase injector pulse width, but timing retard for knock comes from the EZK. O2 is part of the Lambda = 1 system and is strictly fuel.
2. "- The past owner mentioned they had the mechanic "advance" the timing. Could the mechanic have reversed the distributor in the head intentionally? I've read that when replacing the distributor you can install it 180 degrees out of whack and then have no luck getting the timing right. Any way to verify this distributor is in right by pulling the distributor? "
The distibutor shaft has two drive dogs offset from center on either side of the shaft that engage two offset slots in the cam. I think you would have to do some serious cut/grind/smoke wrench work to reverse it, or repostion the hall switch, or reposition the rotating vane on its shaft. To verify, you could pull the distributor and look for any evidence like this.
I think the throttle switch is worth checking at this point. With no throttle closed signal the EZK (and LH) will set up the timing ( and injector pulse width) according to whatever is on the data map for the remaining valid parameters.
Finally, to see if your harmonic balancer is slipping, turn on the A/C.
Good luck
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bagle 87 745t
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