My father and I were thinking that this may be being caused by a stuck check valve a while ago, and it does make sense... kind of. If its stuck open to a point it will never let the oil pressure go above 2bar, then why would it let the pressure drop farther when you step on the gas? Could it be opening more, and then getting stuck in a more open position? Because the pressure does not return to 2bar after stepping on the gas, and if you shut the car off, then start it up again it will not be at 2bar either, you have to let it sit for a bit...

What is involved with checking the check valve?

Thanks,
Jimmy

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1985 190E 2.3-16v Euro
1980 300GD SWB

Not sure how the check valve operates, so don't want to go out on a limb with a diagnosis, but I could imagine debris in the oil pan causing such a situation. If something is clogging the pipe so it only reads 2bar, with more small stuff that can get sucked into the screen when you rev the engine (thereby increasing sucktion at the intake, but blocking pressure after the pump), you could end up with a screen that blocks more and more oil as the revolutions of your engine increases.

The check valve is on the timing chain cover on the drivers side-low i think. If you don't have a manual-get one, or rather, get as many as you can, many times they overlap.

My 2-bits say you have pieces of guide-rail that broke off after getting *****-slapped by the chain for too many miles. Dropping the pan isn't terrible, and it will let you check for pieces. If you find pieces though, you might want to pull the engine and do the rail-replacement with it out of the car.





cheers,
dan

I have to give you credit, you hit it right on, nice call.
Jim

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1985 190E 2.3-16v Euro
1980 300GD SWB