These are my O2 readings on my Scanmaster. Rinse and repeat 402;406. Millivolts do not change whether in neutral, drive, 800 RPM or 2500 RPM. Car has been down now for 8 months, have run through and replaced all "obvious" parts and pieces (and not so obvious) to try to get my O2 readings back in operation.
Have replaced O2 sensors 3 times using multiple manufacturers, different ECM, new CHIP, vacuum hoses and check valves, Exhaust Headers (original were FUBAR), TPS, stock to TR6 Ignition and several other sensors that have nothing to do with the O2 readings but needed to be replaced anyway.
Car starts and idles OK, but with the constant 402;406 readings car is running pig rich. In drive and any load put on the motor I'll get a backfire and instant stall, can barely pull the car out of the garage. Last ditch effort before requesting for assistance on this board was to hotwire new leads from the O2 sensor to PIN D7 on the ECM connector and to run a new ground from a grounded source to PIN D6...............nothing changed.
On a running car if you disconnect the O2 sensor the car will run 406mv as a default. Not sure where the 402 comes into play but the ECM is acting like it is not getting a signal from the oxygen sensor.
I'm tapping here, have run out of ideas and my other sources for technical info have come up short. Has anybody on this board heard of or experienced a similar condition? Will try any and all suggestions to fix this gremlin.
TIA
Have replaced O2 sensors 3 times using multiple manufacturers, different ECM, new CHIP, vacuum hoses and check valves, Exhaust Headers (original were FUBAR), TPS, stock to TR6 Ignition and several other sensors that have nothing to do with the O2 readings but needed to be replaced anyway.
Car starts and idles OK, but with the constant 402;406 readings car is running pig rich. In drive and any load put on the motor I'll get a backfire and instant stall, can barely pull the car out of the garage. Last ditch effort before requesting for assistance on this board was to hotwire new leads from the O2 sensor to PIN D7 on the ECM connector and to run a new ground from a grounded source to PIN D6...............nothing changed.
On a running car if you disconnect the O2 sensor the car will run 406mv as a default. Not sure where the 402 comes into play but the ECM is acting like it is not getting a signal from the oxygen sensor.
I'm tapping here, have run out of ideas and my other sources for technical info have come up short. Has anybody on this board heard of or experienced a similar condition? Will try any and all suggestions to fix this gremlin.
TIA
