i noticed that my o2 sensor like to read pretty low on my scanmaster ever since i put the pacesetter long tubes on is this normal or do i need to replace them. they hang around .065 Mv for bout a second then go up about .9##.

 

do you have a single wire o2 or a heated 4 wire one?

it might be because your longer tubes allow cooling quicker and don't help as much with heating the o2 but this is easily fixed by upgrading to the 4 wire heated o2 sensor

 

I have the heated four wire.

 

where the 4 wires before the long tube? also did you have to do anything to the wires when you put in your tubes?

 

Does it do that on both or just one? I've noticed my driver side will read less than 200 mv and it dumps a lot more fuel in on that side. If you are driving the car and they're showing low then I'd see about replacing them.

 

it has had four wire ever since i owned the car. and the only thing i did to the wires when i put them in was put the extentions on them.

 

Did you ever figure this out. My car with scanmaster also seems to give weird low 02 readings sometimes at wot when it stores it.

I have replaced fuel pump, fuel filter, fuel reg and flushed out injectors. Still same ,also see some knock retard that makes no sense either.