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Old 04-25-2004, 12:12 AM
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Join Date: Feb 2002
Location: queens,new york
Posts: 355
poor gas mileage/1973 450sl

I have driven the car all week and have managed to get only 100 miles out of a tank of gas. I popped the hood and found the air cleaner hose disconnected from the crankcase. I reconnected it. How much did this contribute to my poor gas mileage? thanks

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Old 04-25-2004, 07:05 PM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
Very little I imagine.

That D-jet system needs a bunch of extra timing and a fuel/timing combination that gets 17in of vacuum at 800 rpms and you will get decent mileage.

I'd start with about an extra 7 degrees of timing and if an exhaust gas analyser isn't available go lean untill it runs bad and then go rich until you first reach highest manifold vacuum, hopefully 17in..

Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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