I’m curious, how did you check the cylinder firing? My engine (another thread) is missing on one cylinder. It seems smooth then stumbles. If I were missing on 4, I don’t think mine would run.

If your only hitting 4 of 8, what 4 are missing? If your hitting 4 of 8 and the missing cylinders are getting spark, then your hitting very strong on the good ones to turn the engine enough to set timing. Have you tried moving the timing light pick-up unit to other cylinders while the engine is running? This would show spark and if cylinder one hits at 5 ATDC then all others have to hit in that same sequence. So with the pick-up at #2 cylinder and if your crank is marked it should read 270 degrees.

I was shown a trick by an Ex-Mercedes mechanic at work. The rotor should flex with tension on the shaft. Lift the rotor from the shaft. Pull the felt from the center of the shaft and oil lightly (1 drop) with machine oil while exercising it back and forth.

Good luck to you. I think mine is an exhaust valve. L

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1983 500SL Euro