[diesel_mercedes] Re: 1981 240D stick vacuum problems

 


You're barking up the wrong tree here ;

Once you apply throttle , the vacuum makes NO DIFFERANCE . you can disconnect the big main vacuum pipe and it'll run the same .

I'd begin with a valve adjust then change both fuel filters and add some White Bottle Diesel Kleen .

About your vacuum connections :

Yellow is the central locking , simply disconnect and plug it .

Green is for the HVAC .

Brown is for the engine shut off , check the two short rubber hoses under the dashboard that connect the key switch to the brown plastic pipes ~ they're almost always soft & blubbery & leaking massive vacuum .

-Nate
       Roland Wrote :




 

My 1981 240D standard has been giving ne fits with a stumbling and
stalling problem - as well as what I thought was a brake booster gone
bad. WRONG! At least I now think the problem is a vacuum leak. My
pump puts out about 18 inches of vacuum, which is about right at 4000
feet elevation. I have looked for a couple of years for a vacuum
diagram for my specific car. No luck anywhere. Anyone out there with
help??

I think that I have about 10 inches with everything hooked up. I think
the vacuum goes so low that the fuel shutoff starts to shut down the
engine and it starts to stumble. I have a Mityvac and so can test
stuff. The problem is not knowing where anything goes. There is a
green/yellow (I think) line into the "Tee" off the main line from pump
to the brake booster. I has been broken off and the "Tee plugged. I
really need a vacuum diagram in order to track the leak. Somebody help?

Roland Hyatt
1981 240D stick 210K+
1984 300SD 190K
1980 240D auto 250K)
1983 240D auto inop
1983 300SD inop

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