Date registered: May 2011
Vehicle: 1970 Mercedes 250c, 1977 mercedes 230 (put to rest at a junyard she served me well)
Location: Great Barrington, MA
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I have done a basic misfire check,
started it up, remove wire from plug 1, observe idle speed, etc.
cylinder two seems to be misfiring when cold, but better when it gets hot,
I enriched the mixture a little bit, not sure if that made any difference,
Funny part about the spark plugs is:
after it broke down due to dead ICU, i did a compression test w my buddy, and ended up crossing the threads w the compression tester. We decided the best thing to do was to force/thread the plug back in and try and get the threads to reform as best they could. The bad threads are on cylinder one, as it goes from 1-4, front to back. The bad cylinder according to my test is cylinder 2.
The bad threads might be totally irrelevant, but definitely suspect.
Cylinder two seemed to be the problem cylinder according to the test.
I want to take all the plugs out and replace them but I'm afraid to find what the threads might look like, although i think they're probably decent.