I've been having some shutdown trouble with my '82 240D (auto, 230K). It shuts down okay (not quite immediate like my 300SD, though) IF I drive for less than 15-20 minutes, but much more than that I have to turn the ignition off, leave it in drive, and wait for the slow wind down, which can end in a car-shaking, shuddering halt, usually in 5-10 seconds, but sometimes it can take much longer. I can't imagine what bystanders must think of this spectacle, but the little diesel does eventually stop. I don't use the stop lever under the hood because pushing it only reduces the rpm and does not stop the engine. The problem seems to worsen as ambient temps rise.

My questions:
1) I measured about 16 in. hg going into the shut off valve when key is turned off. Is that sufficient to operate the valve? I ask because I seem to have 20+ in. hg off main vacuum pump line and at vacuum line splitters. Door lines are blocked. I have been searching the site extensively, but I haven't been able to find definitive vacuum reading specs.

2) Is it possible to get blowby out of the rear area of the IP? This engine is a little tired, and blowby from the oil filler hole on the valve cover is pretty bad. I cleaned all the surface oil off the IP and surrounding area, but I still have a very obvious oil vapor coming from the vicinity of the back of the pump.

Many thanks for responses.
Mike F.
'82 240D 230K
'82 300SD 180K
currently tempted by an '84 300D that seems to have my name on it