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On a whim I decided to check the O2 sensor. Its a brand new bosch sensor. I attached a meter and saw an output from the sensor usually about 100mv and occasionally dropping to about 40mv or so. So I took it for a 2 mile test drive with the O2 sensor disconnected and it ran the same as if it was connected.....ie I still had the misfire/stumbling/hestitation. And upon my return I checked the codes and there was still no code for the O2 sensor.

Now I am quite confused. I expected there to be huge difference between running with and without the O2 sensor. And I also expected a code to be generated.

Any help would be appreciated.

Thanks,
Gregg


Problem solved.

Ditch the Bosch sensor, and order an OEM sensor (Denso). The probe on the Bosch is too short to reach into the exhaust stream, so the ECU can't go by those readings.

"A young man who does not have what it takes to perform military service is not likely to have what it takes to make a living." - John F. Kennedy

Proud owner of an 88 Montero (with a blown engine).