Date registered: Jun 2005
Vehicle: W124/230E, W202 C240 stationwagon, W210 E280 facelift
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RE: W210 1997 Ignition question
I think your problem is from the fuel system, if your engine is a straight six, you might want to check the fuel rail damper. it is the one in front of the injector rail with a vacuum hose connected with it, to test this, when the engine is running try to disconnect the vacuum line, if fuel leaks out in the damper, or any traces of fuel in it you must replace the damper.
If your engine is the V6 type, you might have to replace the fuel filter. the damper is together with the filter.
Better yet if you can install a fuel pressure gauge the better. normal fuel pressure for your engine should be around 3.8 bars at idle speed.