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#1
08-09-2008, 12:22 AM
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'73 450 SE (W116) - checking system vacuum?
Hello All,
A quick vacuum testing question, if I may... 1973 450 SE (D-Jet). If I disconnect the vacuum line at the MAP sensor, and leave the other end connected to the engine, should I be able to pull down a vacuum on that line (using the Mityvac)? Thank you, Joe 
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#2
08-14-2008, 09:08 PM
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That is the vacuum source hose to the MAP. Hose off, the engine probably wont stay running because of a constant vacuum leak. If you mean, engine off, mighty vac hooked to the hose and can you pull a vacuum "NO"
__________________
81 300CD (sold) 1972 280 SEL 4.5 (sold) 1966 250 S 4 spd (sold) 1974 450 SL (sold) 86 BMW 325ES (sold), 1973 280C (sold) 1988 300 SE.
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#3
08-15-2008, 01:22 AM
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Thanks very much carnut. At least I now know that I can't tell how good the vacuum system is using the method I described
 . I have been trying to track down a vacuum leak. I replaced the MAP hose, and the connector between the two hard lines on the vacuum advance. I have plugged the connection to the central locking system. I just got some ramps today to get underneath to check the line to the transmission modulator (maybe this weekend). I know it is just a process of elimination. I am hoping the manifold plenum seals are not the problem!Thanks again, Joe
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