RevGTO
November 19th, 2012, 06:05 PM
I've been running the same Calc.VE tune for over two years and had my AFR's dialed in pretty closely. Several weeks ago I went to the track for the first time in a year and a half. My times were off about 6 tenths and 7 mph. Since then, I've been able to determine that when I go WOT, my NB O2's initially peg to 850-950mv and then crater to 75-150mv and hold there. AFR's are in the 16-18:1 range when the NB readings are low. I'm lucky I haven't blown my engine!
I unplugged my MAF and logged and got the same behavior. MAF has been cleaned, fuel filter replaced, injector cleaner run, I have no apparent misfire, no DTC's, and the NB's seem to perform normally at part throttle. IBPW, Maffreq, INJDC all are normal. I should mention that I do have my O2 sensor DTC's turned off because of the usual low voltage/switching codes that occur with LT's.
Any suggestions??
I unplugged my MAF and logged and got the same behavior. MAF has been cleaned, fuel filter replaced, injector cleaner run, I have no apparent misfire, no DTC's, and the NB's seem to perform normally at part throttle. IBPW, Maffreq, INJDC all are normal. I should mention that I do have my O2 sensor DTC's turned off because of the usual low voltage/switching codes that occur with LT's.
Any suggestions??