ok i got ahold of a vacuum gauge now where do i hook it up?
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Joined: Mar 2003
Posts: 522
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From: Michigan
Car: '88 Red Trans Am w/ T-tops
Engine: 305 TPI
Transmission: T-5
ok i got ahold of a vacuum gauge now where do i hook it up?
I want to check the vacuum pressure levels on my car but not sure where to hook this up to. And what reading should i get?
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Joined: May 2000
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Car: 1982 Z28
Engine: LS1
Transmission: T56
I always used the vac port on the passenger side of the upper plenum that feeds the fuel pressure regulator.
With a stock cam, somewhere in the 15-17" Hg range at idle is usually good.
You're looking more for fluctuation...at idle, the needle should be rock steady w/ a stock cam. Even my lumpy HOT cam pulled 12" steady at 800rpm idle. If the vacuum is bouncing around, you have problems.
With a stock cam, somewhere in the 15-17" Hg range at idle is usually good.
You're looking more for fluctuation...at idle, the needle should be rock steady w/ a stock cam. Even my lumpy HOT cam pulled 12" steady at 800rpm idle. If the vacuum is bouncing around, you have problems.
Last edited by kevinc; Apr 15, 2005 at 05:54 PM.
Thread Starter
Senior Member
Joined: Mar 2003
Posts: 522
Likes: 0
From: Michigan
Car: '88 Red Trans Am w/ T-tops
Engine: 305 TPI
Transmission: T-5
mine was reading around 15. The idle would go up once in a while for some reason and it might reach 18 at those times. The reason i was checking is cause of this searching idle problem. But when the idle was even the meter read about 15. So does this eliminate any vacuum leak concerns?
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