*bmxking*

so my car will idle at around 800 and then it will rev up 100 rpm or so and somtime drop. the shop i went to told me it was the aftermarket o2 sensor so i replaced it with a factory one and it still does the same thing. i have a a/f gauge and it spikes from rich to lean when the rpm jump. and thought anything will help thanks

GidyupGo

Does this happen all the time or only when cold?

hammeron

could be a few things...

air leak in the air intake (after the MAF)
MAF needs cleaning
throttle body needs cleaning

*bmxking*

all the time

*bmxking*

i read omthing on hear about people having probs with cam postioning sensors

Simon1

It could be lots of things. I would check all air connections, boost and vaccum.

Maybe reflash the tune too.

hammeron

that was one person, dex i believe...

one of the sensor wires was broke (or it wasn't connected,
can't remember) and it was causing the car to run extremely lean....

that was the story as i recall it.....