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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Marc Galassini

'93 300CE 38K Sold
'89 560SL 19K Sold
'91 300SE 191K Totalled 11/6/08
'90 300SE 90K

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.

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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[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.

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

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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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