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Originally Posted by Holson Adi
The fuel Pressure Regulator that was in there was a Mercedes unit and the replacement is a Bosch unit rated at 3.8bar.
Could that be it? I HOPE!
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Holson,
I went through the same process with my 95 E420 shortly after purchase -- replaced the fuel pressure regulator as you did, with great results. Next on my list of minor r/r items are the ignition coils, which lose their effectiveness over time. If the engine still takes a while to turn over, this might be a good place to start looking (and relatively cheap to replace).
Regarding the sludge on the spark plug, I know what that is too: the spark plug ring on the valve cover seal is leaking. I do not believe you can remedy that without replacing the valve cover gasket (probably not a bad idea anyhow).
-DM