I have 1988 model 200 which was imported from Germany as a second hand vehicle.For the past month or so whenever i shut the engine after a ride it get off with few jerks in the engine as if there is a missing. The guys here dont know head or tails about it. They said the problem is in the Pre Ignition. Will the problem change if i change the carburetor? Plese help .

From what you described it sounds like the engine keeps trying to run after you have shut it off. I think the ignition timing is off and needs to be checked/reset.

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Mike Tangas
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72

'02 CLK320 Cabriolet - wifey's mid-life crisis

2012 VW Jetta Sportwagon TDI...at least its a diesel

Non illegitemae carborundum.

Try running some high octane gas first.

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Mike

Yeah, sounds like pre-ignition. This is caused by something in the combustion chamber running hot and igniting the fuel even without a spark.

The usual causes are poor octane fuel, ignition timing over advanced or carbon deposits.

This is less of a problem with injected engines as the fuel supply shuts off when you turn off the ignition supply.