General Category > Quadrajet Carb Talk and Tips
78 Qjet stuck on fast idle?
wazzabie:
Hi Cliff, I tried using some wd40 to lubricate the pivot point for the fast idle cam and still have the same condition. The fast idle cam moves down when I tap the gas but not enough to engage curb idle. I have to manually push down the fast idle cam the remainder of the way to engage the curb idle. I'm thinking about adjusting the fast idle cam screw to loosen some tension. Your thoughts?
lightning boy:
Does this carb have a rear choke pull off?
wazzabie:
--- Quote from: lightning boy on October 19, 2023, 04:54:47 AM ---Does this carb have a rear choke pull off?
--- End quote ---
No. The carb just has a single primary choke pull off. The choke pull off retracts when the engine starts.
Cliff Ruggles:
The divorced choke on the intake should get hot enough after a few minutes of run time to overcome the spring inside the pull-off and allow the fast idle cam to drop to the lowest position and over to the curb idle screw.
Check the divorced choke to make sure it's heating up and pulling down hard on the choke.....
wazzabie:
--- Quote from: Cliff Ruggles on October 21, 2023, 01:09:29 PM ---The divorced choke on the intake should get hot enough after a few minutes of run time to overcome the spring inside the pull-off and allow the fast idle cam to drop to the lowest position and over to the curb idle screw.
Check the divorced choke to make sure it's heating up and pulling down hard on the choke.....
--- End quote ---
Maybe I'm not waiting long enough for the engine to warm up. I tap the gas after about 3min and it still remains at 1700rpm. I have to manually push down on the fast idle cam to obtain curb idle.
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