bad o2 = fuel cut or break up
 

well Its a 87 t2 in a 1st gen running a rtek 1.7 and basically after it warmed up it would start to buck and hesitate (more you got on it the more it would buck) The only eror code I was getting was the o2 so i replaced it and the tps at the same time and now it runs great however I am still getting the o2 code some times. so basically I was wondering if anyone has ever had a simular situation,
Thanks
kevin

oh yea, before it warmed up it would drive great and boost good. It seemed as soon as the 02 sensor would be heated up enough to read it would start bucking.

stock ECU ?

on my FD i removed the o2 sensor totally , I dont think your looking in the correct spot for your problems bro

:confused: Did you even read his post?! IE running rtek 1.7 ?! :confused:

no i honestly didn't

Im having the same situation right now but haven't had much time to work on my car.Is your car still bucking like it used to?

well its actually my friends car, and it is running great now.

The O2 sensor is ignored by the ECU if the engine is doing anything other than low-load cruising. It is not the cause of this problem. If the problem comes and goes according to temp, the coolant thermosensor on the back of the water pump should be the first suspect. However I had exactly the same symptoms and it turned out to be an ingition lead...

Long shot...are you running an S-AFC?


-Ted

pretty much, you don't need the o2 for anything special if it's not a wideband it really doesn't do much

no s-afc, already checked water thermo sensor so I guess it was the tps