Quote:
Originally Posted by SnowRacer
One additional detail I just remembered this morning: occasionally there was smoke out the exhaust at cold start up too. Just a few times and not consistently. That also started happening after the large smoke cloud at WOT and the error codes.
It hasn't done that again since the valve cover / CCV replacement, but we've only started it a handful of times since. Not enough data yet to be conclusive that it's gone.
Gary
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Is the smoke you are getting blue in colour or white? When the engine is smoking at WOT, and misfiring is it making detonation/knocking noises?
You could try and disconnect the breather hose from the valve cover, plug the breather hose so the engine will still run and then try a WOT run. If the smoke is still appearing after trying this then that has ruled out the breather system.
Bear in mind it will probably throw fault codes when the breather hose is disconnected, but may be worth trying as a process of elimination. If it is still smoking it may be an injector. Is your engine an N52k?