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Old 12-26-2003, 09:26 PM
zeggate zeggate is offline
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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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