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02 sensor signal wire
connect your scope or DVOM to the 02 sensor signal wire
(black wire)
the two white wires are the heater wires and the gray wire is signal ground
drive the car at WOT when hot with the symptom occurring
what is the voltage on the 02 sensor signal wire
if it is low , around 100mv the system is lean - suspect something that will drive system lean like
LOW MAF sensor output OR low fuel delivery
if
02 sensor voltage is high around 850mv , suspect clogged cat
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or the 02 sensor is FRAKED
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can you get to FUEL TRIM values ? and Calculated load values in
the OBD2 system ?
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