Hyperspeed97z28

What should all my sensors voltage's be at?

Such as TPS.. MAP.. IAT? O2's

what should all this stuff be at? or proper ranges?

would like to see if my O2's are crapped out. way to tell? or if they are heading out.. Thanks for the help...

Josh-'04 GTO

Well, the TPS should be around .5 volts at idle, and around 5 volts at WOT. The IAT is the intake air temp, so it should be not far from ambient temp. MAF voltages should be similar to the TPS. I wouldn't worry much about the MAP, since the MAF is calling the shots in regards to airflow and engine load. The O2 sensors should "crosscount" quickly under normal driving. This means the values should jump under/over 450mv. Under WOT, the front O2 sensors should come in around 780-800mv. O2 sensors that are slow reacting should be replaced.

Hyperspeed97z28

Thanks Bud, Is there anything else I should check while I can use the scanner?

Josh-'04 GTO

Take the car out, and without crashing , use the scanner at WOT to check to make sure you aren't seeing knock retard, and that your front bank O2 sensors are reading the 780-800mv I posted earlier. Problems in those two areas would cost your horsepower.

Hyperspeed97z28

Will do.. Thanks for your help.. How quick should the O2's react ?

ledfootz28

did u buy the snap on scanner,how much?

Hyperspeed97z28

Friend that works at a garage is letting me use it...