Hi!

Here's what I've noticed: When the engine is freshly started the idling goes up and down. *Take note it's not rough. A better way to describe it is that it like REVS up every 5 secs or so. It can be simulated in a tuned engine when you "press & let go" on the accelerator every 5 secs.

Someone told me it could be vacuum related. Does vacuum have something to do with the 300D's engine?

Thank you again!


Francis
85 300D 55K
Philippines

Diesel engines are not throttled, thus they do not make vacuam. The problem you describe is called "hunting", and is probably related to the govenor. This should be a minor adjustment for a Benz diesel technician.

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Larry Bible
'84 Euro 240D, 516K miles
'88 300E 5 Speed
Over 800,000 miles in
Mercedes automobiles