Vacuum gauge reading

Engine troubles? Try here.
Post Reply
pinzinator
Posts: 740
Joined: Thu Jul 29, 2004 3:12 pm
Location: Indio, California

Vacuum gauge reading

Post by pinzinator » Fri Sep 22, 2017 11:04 am

What would be considered a normal reading on a vacuum gauge when connected to the intake? How steady should the needle be on a good engine?

User avatar
rmel
United States of America
Posts: 639
Joined: Sun Sep 25, 2011 12:19 pm
Location: Woodside, CA
Contact:

Re: Vacuum gauge reading

Post by rmel » Fri Sep 22, 2017 2:48 pm

Assuming your vacuum gauge is calibrated in Inches of Mercury, at idle 800 -- 1,000 RPM should be about -17 to -20 InHG.
MAP readings are going to be strongly dependent upon load and RPM (and leaks).
Puller: 710K 2.7L EFI
Follower: Sankey MK 3, 3/4 Tonne
Driver: Ron // KO0Q

Post Reply