| FAQ |
| Members List |
| Social Groups |
| Calendar |
| Search |
| Today's Posts |
|
#1
08-18-2025, 11:04 AM
|
|||
|
|||
Quadrajet tune
I’ve got a 69 carb 7029263 that seems to be developing an issue. Carb bogs when going from coast to light throttle. Problem is worse when engine is not fully warmed up. Once warmed up it is not as bad but still a slight hesitation at transition from idle to main circuit. Rebuilt a few years ago to Recipe 2 using Cliffs parts and manual. This bog seems new. No changes. Running on 9.5 comp 400 with 068 high lift cam. What should I look for to correct this. Thanks for any feedback
|
|
#2
08-18-2025, 11:32 AM
|
||||
|
||||
|
Sounds like a lean condition has developed.
The metering power piston could be hanging up either due to crap on it or in the Bore, or the air horn gasket might have expanded and or shifted and is now hanging up the metering Rods. Could also be fine dirt in the air bleeds
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
|
#3
08-18-2025, 12:12 PM
|
||||
|
||||
|
Besides the internals in the carb malfunctioning look at the basics such as gasket deterioration under the carb, and intake to cylinder heads gaskets. Vacuum hoses are also a culprit many times causing lean conditions. I'd be looking for a vacuum leak first, before condemning the carb.
You also have the distributor vacuum advance canister and depending upon what distributor you're using the wiring inside of the distributor on HEIs that tend to fray on the pole pieces. Also on HEI's make certain the mechanical advance weights and springs under the rotor aren't binding, or frozen. 
__________________
Brad Yost 1973 T/A (SOLD) 2005 GTO 1984 Grand Prix 100% Pontiacs in my driveway!!! What's in your driveway? If you don't take some of the RACETRACK home with you, Ya got cheated    
|
|
#4
08-18-2025, 10:32 PM
|
|||
|
|||
|
Accelerator pump?
|
|
#5
08-18-2025, 10:40 PM
|
||||
|
||||
|
Quote:
If it’s off idle and it just showed up I’d start there myself as long as the ignition tune hasn’t changed
__________________
The More People I Meet, The More I Love My Dogs! |
|
#6
08-23-2025, 11:00 AM
|
|||
|
|||
|
Problem solved. Thanks for all your inputs!!
|
|
#7
08-23-2025, 11:14 AM
|
||||
|
||||
|
Oh yes., that will make for that issue, nice find!
Some of this JB weld stuff for fixing fiberglass will get that back in action in two hours while you order up a new one. Mix it up and wait for it to start to set a good bit and then apply it .
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
| Reply |
|
|
The PY Online Forums is the largest online gathering of Pontiac enthusiasts anywhere in the world. Founded in 1991, it was also the first online forum for people to gather and talk about their Pontiacs. Since then, it has become the mecca of Pontiac technical data and knowledge that no other place can surpass.
Linear Mode
