Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

Idle problem

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dlphil10:
Ok so I got the car back out today. It was warmer than in the past. It got up to 67 today. I noticed my secondaries wouldnt open all the way so I adjusted the linkage to do so with them on the car.

Good news is after heat soak I got the idle at 625rpm and backed the mixture screws out to when now I can remove the trans vacuum line amd it picks up 50 or so rpm. They're out 4ish turns, but it seems smoother than before. The car is popping on part throttle now before the power piston opens, but I'm guessing I may have too much timing now that its richer, but I didnt have time to mess with it anymore.

Now that the secondaries throttle is adjusted, the linkage keeps popping off going down the road. Any tips on keeping it in? I dont have the correct 4 barrel throttle cable or linkage, but I cant be the only one that didn't replace the 2 barrel throttle cable.

tayto:
when rebuilding the carb you set both primary and secondary plates to open 90*. they usually go over centre or not far enough. you can file the base for primary and bend the pins so they have a positive stop. not sure what you've done to the linkage but i've never had that issue. the only time i had an issue was with a marine carb, there was no way to set a positive stop so i just tweaked the linkage on the bench so it was just right. this is all outlined in cliff's book.

tayto:
are you referring to the secondary air door on the top of the carb?

dlphil10:
It's the throttle linkage for the actual secondary butterflies, not the air door. Air door opening has been adjusted via the spring and opening distance.

dlphil10:
Attached is a picture of the linkage where itconnects to the  secondary shaft. The cam/lever on the primaries shaft has enough play in it that it allows the linkage to travel toward the primaries in the slot at the secondaries and slides out. I'm assuming this happens when the throttles whip shut. 

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