Vacuum Leak?
Thread Starter
Advanced
Joined: Mar 2009
Posts: 87
Likes: 19
From: Merritt Island Fl
Vacuum Leak?
On my 82 I think I have a vacuum leak, not 100% sure. Lights go up and down fine, but I swear I can hear what sounds like a vacuum leak and then it "goes away". I have a vacuum gauge, so (1) best place to check (2) what should it read at idle.. (3) will it change as the car warms up?
Thanks,
Fred
Thanks,
Fred
Drifting
Joined: Aug 2003
Posts: 1,868
Likes: 13
From: Mascoutah IL
I had an 82 about 8-9 years ago... I fought "vacuum leaks" the entire time I had the car... How does your car run??? My headlights worked fine, but the throttle bodies would not tune up without "all" vacuum leaks fixed... I got it drive-able, but think it still needed a throttle body rebuild when I sold it...
Rogman
Rogman
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
The HVAC controls are operated by vacuum, also. If the sound you hear is when you are moving the HVAC controls, that is to be expected. If you are not changing anything, and you are hearing a 'hiss' in the car, it is likely in the dash area or in the transmission tunnel area with the controls. A consistent hissing sound should not be present in the car.
Thread Starter
Advanced
Joined: Mar 2009
Posts: 87
Likes: 19
From: Merritt Island Fl
The HVAC controls are operated by vacuum, also. If the sound you hear is when you are moving the HVAC controls, that is to be expected. If you are not changing anything, and you are hearing a 'hiss' in the car, it is likely in the dash area or in the transmission tunnel area with the controls. A consistent hissing sound should not be present in the car.
Le Mans Master
Joined: Jul 2000
Posts: 6,664
Likes: 162
From: columbia city in
find the vac line that goes into the firewall.it should come off the line in the back of the rear throttle body or the vac line off the intake .block it off and see how the motor runs and if you still hear the sound.
