My '85 300TD has started acting up - periodically (twice now) it won't shutoff and I have to hit the STOP switch under the hood - I know there's a lot of messages on this topic already, and I understand that it's related to the vacuum system, but - where do I start?!

THx,
James

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1987 Mercedes 300SDL; SOLD
1985 Mercedes 300D; SOLD
2006 Honda Pilot - wife's ride; 122K;
1995 Toyota Land Cruiser - 3X locked; 182K

Start by getting a mityvac and determining which subsystem is at fault. For example you can isolate the door locks and the vacuum reservoir at the firewall. Chances are good that the door locks are the culprit. Get familiar with the vacuum diagram for your car for help in tracking the problem down (find which components don't hold vacuum which should).

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For Sale: 1982 MB 300TD
1995 Chevrolet Suburban 6.5TD

Sold: 1980 IH Scout Traveler- Nissan SD33T Diesel

mine was the line on the drivers side that has a check valve and two major vacuum lines going to it... Couldn't hear it, couldn't see it, wrapped a rubber glove around it, bam shut off. Also, get a mityvac and apply vacuum to the lines running to the back of the INJ PUMP, and see if you shutoff deal is bad.