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Reload this Page low vacuum at idle, a tuning issue?
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TPI Tuned Port Injection discussion and questions. LB9 and L98 tech, porting, tuning, and bolt-on aftermarket products.

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Old 08-16-2009, 02:26 PM   #1
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low vacuum at idle, a tuning issue?
I have a base timing of 6 deg and the car is running smoothly. my vacuum reads around 7-10 hg at idle, but jumps up to the 20s when revved up. I have a "mild cam" -could this cause my low vacuum? Also my brakes hardly work. I have sprayed the engine compartment entirely with B12 and cannot find any leaks in the new mini-ram.
Can these vacuum issues be changed by tuning/bin editing my timing on my MAF setup?
What values would affect the vacuum pressure?
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Old 08-16-2009, 02:57 PM   #2
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Re: low vacuum at idle, a tuning issue?
a cam can definatly affect your vaccum....one route you could go is to pick up a vaccum resivior and that will store any un used vaccum and you should be ok but just MHO
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Old 08-16-2009, 02:57 PM
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Reload this Page low vacuum at idle, a tuning issue?
« erratic idle, help! | New, old guy with a long running issue »

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1985, 350, 6, brakes, engines, hgs, idle, low, pontiac, rule, tpi, tuning, vaccum, vacume, vacuum
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