mdrake

Not every startup but very often. Always cold startup

It has 230000 km on it now. The injectors have never been clean. It only happens after startup though for maybe 20 or so seconds and never again, seems odd. Would it not happen at all times if it was fuel related?

So often shortly after takeoff my 08 wave will start missing alot. The check engine light will turn on and start flashing usually. it doesn't last long and then it works normally. Iv'e have it scanned with a small scanner and nothing comes up.

Thanks for your reply. The codes are gone now since i replaced both sensors yet the problem still persists. There are no fault codes now.

So my 2008 pontiac wave is missing and sometimes staling while ide. It ony misses or surges when it's hot, it will work perfectly when it's cold. After about 15 min of driving the problem starts. It was giving codes p2135(throttle position sensor) and p0340(crankshaft position sensor) Both sensors were replaced as we as the throttlebody. All new parts. But the problem persists. However the codes are gone. No codes are showing now. So obviously that wasn't causing the issue. Also changed the plugs and wires which also did nothing. The engine wont miss if it's in park or neutral, it's nice and smooth.I can step on the gas as much as i want with no miss.There is some oil in the spark plugs but it's been there for years and never caused any issues. When i got the car the seal on top of engine was bad and leaking oil which i replaced(no oil leaking now). I can't see that causing a problem now all of a sudden. My battery is bad which my mechanic says could cause issues if it wont accept the proper voltage from the alternator but why would it only cause issues when it's warm? I can't see that being the problem. Any ideas?