View Poll Results: vacuum at idle

-10

4.90%

-12.5

2.94%

-15

5.88%

-17.5

15.69%

-19

19.61%

-20

30.39%

-21+

20.59%

Voters: 102. You may not vote on this poll

your vacuum at idle.

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Dec 15, 2007 | 11:43 AM

#26

SSdan

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From: between heaven and hell

For the most part at 20, but sometimes around 22

Dec 15, 2007 | 09:21 PM

#27

rukkee

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From: Western NY

If vacuum is in the single digits wouldn't that indicate a leaks some where (or a very high idle) ? I'm asking not stating. The vacuum in my car hasn't changed since it was new so i would guess my car's engine health is ok. Again i'm asking . Thx for any help .

Dec 15, 2007 | 10:29 PM

#28

Blown 4-banger

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Joined: 04-03-06

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From: Mesa, AZ

Mine would be at 15-18 at idle, and it idled at 1100.

Dec 16, 2007 | 05:32 AM

#29

HunterKiller89

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From: Los Angeles

okie..i gots me a science question....if atmospheric pressure is 14.7PSIa, how is it possible to show less than 0PSIa (-14.7PSI gauge)?

Dec 16, 2007 | 11:27 AM

#30

an0malous

Senior Member

Joined: 06-28-06

Posts: 12,577

Likes: 2

From: Canada

vacuum
http://en.wikipedia.org/wiki/Vacuum

Dec 16, 2007 | 12:55 PM

#31

BLK SS/SC

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Joined: 04-23-06

Posts: 197

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From: Phoenix

i was 21 when i started but when the idle came down i was at 17.5

Dec 16, 2007 | 01:00 PM

#32

SSdan

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Joined: 09-17-06

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From: between heaven and hell

Hmm.. Mine fluctuates when warming up from -20 to -15, then warmed up sits exactly at -20.

Dec 16, 2007 | 02:02 PM

#33

LopsidedJester

Senior Member

Joined: 03-13-06

Posts: 1,004

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From: Michigan

Quote:

Originally Posted by Area47

one thing this tells me is who idles over 750

also, how healthy your engine is

What vacuum numbers would be healthy and how come?

Dec 16, 2007 | 02:17 PM

#34

Area47

Thread Starter

Rent me! per hour

Joined: 03-22-07

Posts: 24,161

Likes: 20

From: Still fixing others mistakes.

Quote:

Originally Posted by LopsidedJester

What vacuum numbers would be healthy and how come?

just an average of between 18 and 21.

Dec 16, 2007 | 02:43 PM

#35

Bika

Fail Less.

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From: Brookfield

by negative i assume you refer to in/hg and not negative psi. i idle at 850 and my pressure is 19in/hg.

Dec 19, 2007 | 02:40 PM

#36

Formula96

Member

Joined: 04-06-06

Posts: 336

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From: Longview, TX

my boost gauge sucks...

Dec 19, 2007 | 03:05 PM

#37

Omega_5

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Joined: 10-01-06

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From: Maidstone, SK

Between 55 and 65 kpa depending on the weather and how warm the car is....

That's about 18 inches mercury on average.....

Dec 19, 2007 | 03:14 PM

#38

Kaisoboy

Senior Member

Joined: 12-20-06

Posts: 2,379

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From: Calgary, AB Canada

Mine sits at -16.5 mercury at peak operating temperature and may sometimes drop to -20 mercury on deceleration. Now I also have a mechanical boost gauge and believe they are more accurate than our stock gauges.

cheers