I had been expecting this result. The rough start is gone when cold, but still there when the car is warmed up. Although, it still seems to be improved even at warm start up, but that might be my imagination because I don't think that the air pump runs after a warm start up.

I think that this problem is most likely the fuel injectors leaking. The fuel system seems to hold pressure just fine, since when I took the AFM and fuel distributor off to replace the throttle switch, fuel came out in a forceful spray when cracking the lines to the fuel distro. It had been sitting for many hours before I did the job and I think this rules out the accumulator, but it's not an entirely scientific test... I know.

I'm going to get a hold of one of those ultrasonic jewelry cleaners to clean the injectors. I've heard of people having fabulous results with this method and even if it doesn't fix this starting problem, it will probably improve the engine performance in all aspects... marginally.

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1998 E320 Wagon

1992 300D 2.5 TURBO

1991 560SEL M119.960

1986 300SDL TURBO

1992 500SL Parts Car

1991 420SEL Parts Car