Vaccum reading of 10 hg Is this bad???
Thread Starter
Junior Member
Joined: Mar 2009
Posts: 35
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From: bad axe
Car: 87 trans am
Engine: 305 tpi
Transmission: auto unfortunately
Vaccum reading of 10 hg Is this bad???
I just installed a vacuum gauge on a 91 350 tbi and im getting a reading at 10hg at idle and 0 at wot.
I know that ive got oil leak at the rear of the intake but i didnt think that that would mean anything in vaccum wise.
Also i didnt really know where to tap into to get a vaccum so i put the tee in the line between the tb and pcv valve. I dont know where else i could hook into other than the brake booster but i didnt want to do that kind of a reduction.
Its a truck motor if theres a difference
I know that ive got oil leak at the rear of the intake but i didnt think that that would mean anything in vaccum wise.
Also i didnt really know where to tap into to get a vaccum so i put the tee in the line between the tb and pcv valve. I dont know where else i could hook into other than the brake booster but i didnt want to do that kind of a reduction.
Its a truck motor if theres a difference
Supreme Member
Joined: Jan 2000
Posts: 3,178
Likes: 48
From: Tracy, CA
Car: '87 IROC
Engine: LB9
Transmission: TH700R4
Re: Vaccum reading of 10 hg Is this bad???
10in-Hg at idle is way low for a stock engine. Should be closer to 18-22in-Hg.
0in-Hg at WOT is normal. Remember, the more load on the engine, the lower the vacuum.
0in-Hg at WOT is normal. Remember, the more load on the engine, the lower the vacuum.
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