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Ask Your Question1990 Mercedes-Benz 560SEC
Question: Engine Smoking
Question
Just bought the car. Had high idle and ABS light on. Found bad fuse for that and brought idle to normal. Runs good, oil pressure very good. After about 5 miles of driving it all of the sudden started smoking. Looks blue to me but could be lighter color. Any ideas why it didn't smoke before or what could have caused it to start smoking now or what to do to fix it? Drove the car several times prior to fixing idle and had no indications of smoking at all. Even now seems to run fine, gauges all look good, just smokes bad. Thanks for the help
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Answer #1
Superbob May 31, 2011, 10:20Reply
MasterCheck first that the oil isn't overfilled. Sounds like the engine doesn't smoke until it's at running temperature. First, check the PCV system. If that's OK, I'd suspect that the piston rings are stuck from dirty oil or collapsed from overheating. If the oil's clean and not overfull, and sticking rings are suspect, you may be able to improve the situation by removing the sparkplugs with the engine warm and putting a teaspoon of Liquid Wrench penetrating oil into the cylinders and letting it sit overnight. Put the plugs back in and start it up and drive it. If it's stuck rings, that could fix it. Good Luck.
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