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adjustable vacuum advance

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Old 11-29-2003, 08:33 PM   #1
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Join Date: Nov 2002
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Car: 1986 Pontiac Trans Am
Engine: LG4 305
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adjustable vacuum advance

I just bought a new mallory hei distributor and it says it has an adjustable vacuum advance, How do I adjust it?
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1986 Trans Am, LG4 305cid, Mallory Performance Distributor, Edelbrock Performer Air Gap Intake, 700R4 Transmission, 3" Flowmaster Catback.
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Old 11-29-2003, 11:24 PM   #2
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Car: 87 Firebird
Engine: 350, 416's, 230/230 cam, torkerII, q-jet
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This should get you started
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Old 11-30-2003, 01:19 AM   #3
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The reason I ask this is because my dad said the vacuum advance isn't working properly, he said if you suck on the advance it should hold vacuum, but it isn't, it justsucks right through and doesn't hold. does this mean we have to adjust it?....And could this be causing my car to bogg down at WOT?
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Old 12-01-2003, 04:40 PM   #4
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Your dad is right, the vacuum advance canister should "hold" vacuum. I would replace the vac adv can. At WOT there should be little to no vac adv, it will all be mechanical. Vacuum adv is for part throttle cruising, milage, and sometimes idle.
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