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-   -   'Miss' in engine at idle when hot... sometimes (http://www.peachparts.com/shopforum/tech-help/213853-miss-engine-idle-when-hot-sometimes.html)

1989560SL 02-15-2008 01:25 PM

'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?

TOPGUN 02-15-2008 11:06 PM

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.

t walgamuth 02-16-2008 06:37 AM

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

zcc 02-17-2008 01:58 PM

Also check for vacuum leaks. It's a common problem in the old engines.


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