well these are the Bosch O2s they sell at Napa. I had two new sensors I put in but it's the same. I have heard that these O2s don't work so well sometimes.
well these are the Bosch O2s they sell at Napa. I had two new sensors I put in but it's the same. I have heard that these O2s don't work so well sometimes.
I agree, your front NBO2's are switching too slow (slower than 2 times/second)... in some places it shows several seconds before they switch.
Even when actual AFR is not stoich, the NBO2's switch quickly, their average voltage is what the PCM uses to determine the STFT's/LTFT's.
Also, your MAP looks wrong... when throttle partly open MAP value dips below closed throttle MAP value.
Also, why is IAT so high...?
i.e. there may be 3 or more problems.
well what would cause the map to be wrong? As far as the O2s could it be just the Bosch sensors? As for the IAT I'm guessing it's high because of the under hood heat when it sets after I have drove it. It's been near 100 degrees here for about a week.
I'm not sure exactly what your MAP is doing... check for airleaks.
Vette..
Where on your exhaust are your Narrow-Bands located? Do you have headers?
+1 which headers do you have...?
Might want to test MAP sensor with a handheld vacuum pump while checking with scantool...
Approximately: every 2 inHg increase in vacuum = 1 psi decrease in MAP = 7kPa decrease in MAP
I have Pacesetter long tube headers so the O2s are just in front of the collector.
Interesting. I have mine right before the cat...Quote:
Originally Posted by mvvette97
Wonder if that is an issue?
Those are steel headers...? Are they ceramic coated...?
Uncoated steel will lose heat compared to stainless steel or coated steel or coated stainless.
This may be what is happening... do you get any DTC's...?
just uncoated steel headers. No codes as of yet