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#1
12-26-2003, 09:26 PM
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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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#2
12-26-2003, 09:36 PM
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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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