Hey guys, so been pretty busy the past few months. had to throw away the old engine that was in the Astra and put the second one i got for the rebuild in just so i can keep driving around for studies.
I will have to do a write up about what happened when i can find time.
But i have a slight annoying problem at the moment.
The engine seems to have a lumpy idle now with this second engine, and i cant pinpoint what is wrong.
Things i have replaced:
Temp sensor
front O2 sensor
Spark Plugs
Coil Pack
before i put the engine in i replaced all the timing chain, pullys, head gasket, cleaned and seated valves etc, it has a EGR blank kit with the EGR valve moved to one side, i have been to the exhaust place and both cats have been emptied out so there shouldnt be any blocked exhaust. Im really stuck on what to do, it only does it on idle, ive taken it through the hills alot and through out the rest of the rev range it seems fine, no hesitancy when accelerating and nothing that could indicate that anything is wrong until it goes back to idle. I have noticed that when i take the O2 sensor plug off and leave it running without an O2 sensor it seems to idle more smoothly, though the O2 sensor has been replaced and it does the same with the old O2 sensor as well, so i cant understand why.
So would anyone know what it could be?