Thanks again for the input,

The "Backfire" in the intake just maybe a vacuum foor slaming shut a few seconds after startup. From the driver seat it seams to be from the right side of the engine. A friend with good hearing, like normal as I am not, said it came from under the glove box and sounded like a door slaming slut!, I mean shut.
I took it to a local Mercedes shop, not a dealer, who has been in business since before 1979. He or I could not hear the noise from the valve train. He said the vacuum pump can make the noise as I described and if it goes so does my engine. Anybody have a late model 300D, dark color with a tan leather interior which they want to sell? Or does anyone want a good looking 56 year old wife whom will not drive a car that may not get her home? Iwonder which one would cost less????

You all do good work supporting the cars we love. Thanks to you all.

Jim Maddox, Wilm., DE

300sd
350 sdl at the shop
Unimog diesel doKa

__________________
uptank