Quote:
Originally Posted by oldsinner111
sound like a valve miss at certain rpms,most time valves have a high speed miss.Or if a M104 with coils they can do it.As far as grounding a motor,I always add better grounds to engine to chasiss,and one from batt to motor a extra
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It is not on my E320 the problem occur. It is on a freinds Toyota sorry if I am confusing you guys posting on Mercedes forum it is only because a have seen a lot of people that understand engine performance diagnostic at this forum.
I have a steady vacuum when I check engine and the car have
not hydraulic valve lifter, it's a odd problem if there was a valve problem I guess I should have problems at higher rpm but I have no problem at full throttle.
I guess I should see the problem on the vacuum gauge but I am not.