When driving my 1987 420 SEL the other day I noticed that when the car is at idle their is a slight continues surging of the rpms along with a coinciding fluctuation in the oil pressure gauge.

Any Ideas!

Thanks,

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William
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1987 420 SEL - Like a fine wine only better with age

That means you need to align the fuel distributor. Also check for vacuum leaks.

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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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On a 420 it means that under load the ignition is breaking down.Time for new plugs, leads, cap and rotor.

Thanks for the advice it LOOks like a tune up is at hand it's just the price of everything that has held it off till now!

__________________
William
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1987 420 SEL - Like a fine wine only better with age

I just had my '03 C230K fixed. It had oscillating rpm's during idle. The mechanic sprayed carburator fluid around all hoses. Then he sprayed it near the intake manifold gasket, and voila...He replaced the gasket and the car is idling fine now. $7 for the gasket, $444 for labor.