vacuum levels at idle?
Thread Starter
4th Gear Member
Joined: Apr 2007
Posts: 1,079
From: Big Sky Country
vacuum levels at idle?
So I recently installed a boost/vac sensor. The sensor only has a range of -15 to 30. Well I am getting -12 for vacuum at idle :S
I am told other people, including Mr. Ugly who also has the X, are gettin +/- 20 vacuum at idle. So my question is:
Is 20 the standard of what everyone should be pulling for vacuum, including me? Or is it different at different elevations? I am at roughly 3200 ft. Curious if I have a rather large leak on my hands or if it's just a difference in setups. Thanks in advance
I am told other people, including Mr. Ugly who also has the X, are gettin +/- 20 vacuum at idle. So my question is:
Is 20 the standard of what everyone should be pulling for vacuum, including me? Or is it different at different elevations? I am at roughly 3200 ft. Curious if I have a rather large leak on my hands or if it's just a difference in setups. Thanks in advance
5th Gear Member
Joined: Aug 2005
Posts: 3,213
From: Boston, MA
So I recently installed a boost/vac sensor. The sensor only has a range of -15 to 30. Well I am getting -12 for vacuum at idle :S
I am told other people, including Mr. Ugly who also has the X, are gettin +/- 20 vacuum at idle. So my question is:
Is 20 the standard of what everyone should be pulling for vacuum, including me? Or is it different at different elevations? I am at roughly 3200 ft. Curious if I have a rather large leak on my hands or if it's just a difference in setups. Thanks in advance
I am told other people, including Mr. Ugly who also has the X, are gettin +/- 20 vacuum at idle. So my question is:
Is 20 the standard of what everyone should be pulling for vacuum, including me? Or is it different at different elevations? I am at roughly 3200 ft. Curious if I have a rather large leak on my hands or if it's just a difference in setups. Thanks in advance
Found this on a car repair site:
Because engine vacuum is based on comparison with atmospheric pressure, it varies with altitude just as atmospheric (barometric) pressure does. The following table shows that as altitude increases, vacuum decreases about 1 inch for every 1000 feet above sea level.
Thread Starter
4th Gear Member
Joined: Apr 2007
Posts: 1,079
From: Big Sky Country
One thing I have noticed, and it is coming to my attention now after researching around, is that my brakes have seemed to gotten a tad harder to push (not extreme) than when I first got the vehicle. Since I read that the brake booster has to do with vacuum, maybe I should check the brake booster for a leak? is there a check valve or something that can go bad without fubar'ing your brakes altogether?
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jwog666
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Dec 27, 2021 08:09 PM
