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Old 02-15-2008, 01:25 PM
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Join Date: Dec 2007
Location: Johns Creek, GA
Posts: 46
'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?
Marc Galassini

'93 300CE 38K Sold
'89 560SL 19K Sold
'91 300SE 191K Totalled 11/6/08
'90 300SE 90K
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Old 02-15-2008, 11:06 PM
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Join Date: Mar 2007
Posts: 158
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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Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 33,980
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
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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Old 02-17-2008, 01:58 PM
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zcc zcc is offline
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Location: Kuwait
Posts: 610
Also check for vacuum leaks. It's a common problem in the old engines.
Master Computer Engineer, A+, Network+, MCP/MCSA/MCSE 4/2k/2k3 - Messaging, MCTS, MCITP, MCT, Brainbench, ICDL and starting Ph.D

380SE 1984 <------- Totaled by flipping accident
300SE 1988 <------- Sold
Volvo S70 2000 <---- 4 family
Opel Omega 2002 <-- 4 family
560SEC 1989 <------ Sold
560SEL 1990 <------ Sold
560SEL 1991 <------ 4 my mother
560SEL 1989 <------ Sold
600SEL 1992 <------ Current
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