Quote:
Originally Posted by Diseasel300
Have you checked for a vacuum leak? If you have a leak in one of the intake manifold runners, a lean mixture would sure account for knock.
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I checked visually and audibly. Everything seems ok. I’ll go over it again when I get home from work.
If a specific intake runner was leaking .. that spark plug would show up as lean right?
The car runs great except for a noticeable flat spot or two around 4K while at wot. Just drove 600 miles and got 25 mpg @ 80-90mph hwy speeds. I could take it in for a smoke test
Well the engine temps do spike a lot when in traffic. I think that might be more of a crappy clutch fan setup. All my Mercedes do exactly the same thing