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Old 12-26-2003, 09:26 PM
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Join Date: Feb 2002
Location: queens,new york
Posts: 349
Testing vacuum advance unit

My 1973 450sl is getting poor gas mileage about 6mpg and a miss .Wires,cap rotor are new. I replaced my vacuum elements in the trunk and doors and they work fine. I pulled the vacuum line from the distributor and the car runs smoother. I used a mitey on the distributor advance unit and it does not hold vacuum is this the sign of a faulty advance unit . Don't laugh I am not a mechanic just a DIY'er. Any help is appreciated
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Old 12-26-2003, 09:36 PM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
If it won't hold vacuum it IS defective.

Till you fix it set your timing to 10deg BTDC with all vacuum lines off the distributor.
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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