vacuum into headlight relays
Racer
Joined: Sep 2001
Posts: 397
Likes: 1
From: CORTLANDT MANOR NY
Enough to open them.
I really don't know what the PSI should be but if there is not enough the buckets will not open fully or open very slowly. If your headlights are not operating correctly then you need to check for leaks.
I really don't know what the PSI should be but if there is not enough the buckets will not open fully or open very slowly. If your headlights are not operating correctly then you need to check for leaks.
Racer
Joined: Apr 2005
Posts: 339
Likes: 1
From: San Diego CA
I thought about this question for a few seconds then came to the conclusion that it should be the roughly the same as what you're pulling at the manifold.
That assumption suggests that you don't have any vacuum leaks in the headlight/wiper door system. With a tight system, there should be no loss of vacuum and so the manifold vacuum value should propagate to all components.
That assumption suggests that you don't have any vacuum leaks in the headlight/wiper door system. With a tight system, there should be no loss of vacuum and so the manifold vacuum value should propagate to all components.
Team Owner
Joined: Jun 2004
Posts: 20,216
Likes: 4
From: Smile, it's just the internet.
Originally Posted by big_G
If everything is good (no leaks), 12 inches or so should be a minimum vacuum. My experience shows 12-15 to be about the minimum for proper operation.
Drifting
Joined: Sep 2001
Posts: 1,427
Likes: 1
From: Boxford Mass
Originally Posted by 71SoCal
I thought about this question for a few seconds then came to the conclusion that it should be the roughly the same as what you're pulling at the manifold.
That assumption suggests that you don't have any vacuum leaks in the headlight/wiper door system. With a tight system, there should be no loss of vacuum and so the manifold vacuum value should propagate to all components.
That assumption suggests that you don't have any vacuum leaks in the headlight/wiper door system. With a tight system, there should be no loss of vacuum and so the manifold vacuum value should propagate to all components.
It may be slightly lower than your intake manifold reading, but within 2 or 3 hgs.
