Dear Group,
I have a 1986 560sl with 100K the engine has become rough running at low speed. It shakes at idel and becomes smooth as you start to drive. It sounds like a solid miss at idle but any plug wire pulled off will decrease RPM. I have ohmed out all wires and found them to range 1.1K to 1.2 k the distributor looks great too. After pulling each plug I have learned that my dry compression is 145 to 150 each cylinder. I found four plugs to be quite dry black and the other four to be lean looking ,showing white at the porcelain and ash gray at the tip. I put new plugs in and ran the engine for say ten minutes, the cylinders that had the black plugs now have new black plugs. I think I have a rich fuel problem. Would this be problems with injectors? Can some one tell me what to check next.
Thanks in advance Bruce Buchanan. Brujan(NOSPAM)@the-i.net