Hi am looking for some advice. Been having trouble with my car for a couple of weeks when warm the car has a rough idle and shakes a bit at stand still. The car feels fine under load and pulls well. Any ideas much appreciated. Have checked coilpacks and injectors. Am now thinking o2 sensor as when its cold it idles nice until warm.

My car is a version 2 wrx with a version 8 sti engine running syvecs ecu.

Thanks

 

Is there any way to test a o2 sensor?

All thoughts welcome

 

mafless?

 

Yes mafless..

 

Bump

 

Id go with the ecu coolant temp sensor