Wrong gasket????
Thread Starter
Instructor
Joined: Jun 2003
Posts: 139
Likes: 0
From: Salt Lake City, UT
Wrong gasket????
I recently rebuilt my 1974 Quadrajet, and have been working on timing, idle, etc. I have discovered that I am getting little or no vacuum at the port in the side of the carb pictured below (Vacuum gauge reads 1 in/Hg). This port is attached to the Engine Solenoid, which in turn is attached to the Vacuum Advance on my distributor. Did I possibly install the wrong Throttle Body gasket? Thanks for any help, suggestions...
Race Director
Joined: Apr 1999
Posts: 10,866
Likes: 717
From: Beverly Hills/Pine Ridge Florida
Well, I can't answer your question directly, but I can say that from decades of rebuilding carburetors, including One barrel sidedrafts, AFB's, WCFB's, Rochesters, etc., I always compare the "new" gaskets with the old ones I took out.
On MANY occasions, the carb kits are for multiple applications, and thus have different gaskets, which JUST MIGHT be missing an air bleed hole, etc. Chuck
On MANY occasions, the carb kits are for multiple applications, and thus have different gaskets, which JUST MIGHT be missing an air bleed hole, etc. Chuck
Le Mans Master
Joined: Mar 2006
Posts: 5,427
Likes: 1
From: Tracy California
Originally Posted by 1974slcvette
......This port is attached to the Engine Solenoid, which in turn is attached to the Vacuum Advance on my distributor. ....
The knee bones connected to the shin bone, the shin bones connected to the ankle bone, the ankle bone connected to the.....
No, really, I would buy an assembly manual (costs $30).. It lists through countless diagrams whatever is connected to whatever.. which reminds me.. did you NOT make a note of what goes back where when you dis-sassembled the Qjet?
Thread Starter
Instructor
Joined: Jun 2003
Posts: 139
Likes: 0
From: Salt Lake City, UT
Originally Posted by E_Tar
The knee bones connected to the shin bone, the shin bones connected to the ankle bone, the ankle bone connected to the.....
No, really, I would buy an assembly manual (costs $30).. It lists through countless diagrams whatever is connected to whatever.. which reminds me.. did you NOT make a note of what goes back where when you dis-sassembled the Qjet?
No, really, I would buy an assembly manual (costs $30).. It lists through countless diagrams whatever is connected to whatever.. which reminds me.. did you NOT make a note of what goes back where when you dis-sassembled the Qjet?
I just started to work my way backwards through the hoses from the Vacuum Advance, to the carb... Guess I'll have to pull the carb again.
Thanks for the suggestions.
Thread Starter
Instructor
Joined: Jun 2003
Posts: 139
Likes: 0
From: Salt Lake City, UT
Originally Posted by Chuck Gongloff
Well, I can't answer your question directly, but I can say that from decades of rebuilding carburetors, including One barrel sidedrafts, AFB's, WCFB's, Rochesters, etc., I always compare the "new" gaskets with the old ones I took out.
On MANY occasions, the carb kits are for multiple applications, and thus have different gaskets, which JUST MIGHT be missing an air bleed hole, etc. Chuck
On MANY occasions, the carb kits are for multiple applications, and thus have different gaskets, which JUST MIGHT be missing an air bleed hole, etc. Chuck
Thanks Chuck
Last edited by 1974slcvette; Apr 28, 2006 at 10:46 AM.
Melting Slicks
Joined: Mar 2005
Posts: 2,838
Likes: 10
From: Austin TX
Big G is correct,..you won't see vacuum from there at idle,..it pulls it's signal from above the primary butterflies, which are closed (or almost) at idle.
There's another option on the lower-front driver's side of the carb that pulls vacuum full time.
Some use full-time (manifold) vacuum to run their vacuum advance and some use the ported set-up shown in your photo.
There's another option on the lower-front driver's side of the carb that pulls vacuum full time.
Some use full-time (manifold) vacuum to run their vacuum advance and some use the ported set-up shown in your photo.
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