Quote:
Originally Posted by PeteKz
Do you have both the OXS ECU and the gauge hooked up to the same O2 sensor, or separate sensors? If separate, you may be getting different readings on one bank of cylinders versus the other bank, due to uneven fuel distribution, or intake leaks, or exhaust gasket leaks.
|
They are on separate banks. I have recently warmed up the car, unplugged O2 sensor so that FV goes to 50% and noted the O2 reading. Then shut off the car and removed the OE O2 sensor and put the AEM sensor in the OE cavity and restarted the car. Difference was only .4 AFR right side was higher. Meaning that I can look at the AFR gauge and subtract .4 to get what the OE sensor is outputting.
The difference here is much greater than that. I can set mixture in closed loop with FV or AFR gauge. If I use the FV to set mixture at between 45%-55% the AFR at warm idle reads 16.8% (see pic above) If I set AFR on the gauge to 14.7% (then subtract .4 to get 14.3% actual) FV reads 11.6%.
“I would also put a digital voltmeter on the output of the O2 sensor to see whether your gauge is calibrated. At Lambda=1, it should be about .45 volts.”
What is the best way to do this? Back pin the O2 connector (?) or is there a better place to check it with the car running?
Thanks