Mechanics

BLACK SMOKE,ROUGH IDLEAND OIL COVERED SPARK PLUGS.

1988 Mercedes Benz 560sel • 140,000 miles

My car idles so rough that we need to turn it up to keep it running. Black smoke pours out of the tail pipe. The spark plugs are oil covered and there there is a fuel smell that is very strong. The car eats the gas. We have changed the plugs and it runs a little smooth but then goes right back to running rough.
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Dinohood
May 10, 2013.



Check ignition system, you may have a dead plug or lead, do a comp test to make sure all is well with rings, start here.

Mhpautos
May 10, 2013.