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  #1  
Old 02-15-2008, 01:25 PM
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'Miss' in engine at idle when hot... sometimes

My 560SL with low miles has been idling roughly sometimes, but not always, after it gets up to running temperature. It seems to have a 'miss' in it.

Any ideas on what is causing this?
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  #2  
Old 02-15-2008, 11:06 PM
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MY 560SEL was doing the same thing. It was an open plug wire. A good wire should read about 2k ohms. A new set of BERU wires and NGK plugs cured the trouble. It takes more power to fire a plug at higher cylinder temps.Make sure you are not using resistor plugs.
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Old 02-16-2008, 06:37 AM
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Location: Lafayette Indiana
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Two other possibilities is a valve issue, which can be verified by a compression test, or a dirty injector which can be cleaned.

Tom W
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Old 02-17-2008, 01:58 PM
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Also check for vacuum leaks. It's a common problem in the old engines.
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