Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

Idle Problem

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Shark Racer:
Advance at idle will raise the idle 50-100 rpm at most, not 700.

Disconnect the throttle return spring and lightly pull the throttle back, maybe 25%. Can it return under the power of the accel pump spring?

runnerguy:
OK, Took car for a spin got the carb to act up as normal (unfortunately).  I disconnected the return spring and the throttle returns to the stop on it own, but still will have a idle high same as before, no change. The throttle is hitting the stop when this occurs. I have tried to wiggle the throttles to see if they are hung up this also made no difference. Also I checked to make sure the power pistion was down and it was.

Shark Racer:
Did you play with the secondaries as well?

Any binding at the secondary air valves?

runnerguy:
Yes, I played with the secondarys too. Nothing appears to be binding. I also realized that I don't have to be driving the car for this to occur (or under the engine being under load). I can rap the throttle almost or near wide open just sitting in the garage for this problem to happen. Anyway it is a little baffling. Maybe Cliff can give some insight if he has time.

Dave

Cliff Ruggles:
I would loosen the secondary throttle plate screws and gently tap them into the bores, bump the shaft side to side and put it in the middle of it's travel and tighten the screws.  The throttle plates should fully seal the bores exactly the same on both sides.

Also make sure than there is some clearance at the linkage where it attached to the secondary lever, and not hanging them open every so slightly.

We also sell new returns springs, it may be weak, they come in our HP kits......Cliff

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