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Urq sorting out
Took Huw's advice and monitored the O2 sensor voltage.
At cold start, had .646 to .650.
At 3 min. had .616 to 655 The DC read 49.6 at this point.
Blip throttle = .555 to .594 DC still 49.6 (steady)
Lean 3mm screw 1/16 turn = .158 to .173 DC steady 49.7
blip throttle = .130 to .159 DC steady 49.7
Took it down the block and rechecked;
O2 sensor voltage = .104 to .120 DC at 49.6
Grounding (0 ohms) or disconnecting altogether (infinite ohms) the temp
sender has no affect. The sender registers 90 ohm's when hot, and I have good
continuity to the ECU.
About the time I think I've found it, a double check of the component shows
otherwise. I still feel that I'm close. Does the O2 sensor look suspect? Both
units I have give the same result. TIA