Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

Quadrajet Off Idle Stumble

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429bbf:
some times you can cheat and just peen the end of the shaft where all that garbage is .all the pieces slide over the shaft and then they peen it so it won't come off.that new of carb should not be loose . have you always owned the carb?

Shady Tree Garage:
No, it is not the original carb.  It was a re-build done by guaranteed carburetors in FL in 2012.  It has always had this stumble problem to some degree and it has been tough to diagnose until I noticed this delay in the pump action.  I just finished an engine swap and while the carb was off (it was really carbonned up and filthy, float setting was too high, APT was way rich and the power piston didn't need flicking as it was already up but not sure it didn't pop out when I removed the air horn), I rebuilt and cleaned it again using a factory manual for specs, Doug Roe's book, a white paper from Lars and info from Cliff and the forum.  I think I have it set up and adjusted sufficiently.  Thank you so much for taking the time to help me out with this, I'll let you know what I find.

Shady Tree Garage:
OK 429bbf!  Success!  Boy feeling a little stupid now ... decided I would pull the throttle linkage off the shaft and try to secure the tang better and I am embarrassed to say I found the throttle linkage screw slightly loose!  Tightened it and voila, the two work simultaneously now.  After re-adjusting idle screws to best vacuum, timing and idle speed (because I had screwed around with them all to remedy the situation), the truck has barely any hesitation if at all.  I may play a little with the timing because the note on the air cleaner says 4 degrees and the manual and specs (as well as the new engine's info sheet) specify 10 degrees btdc.  I set it at 10.  I did just get a slight dieseling when I shut it down, but couldn't reproduce it when I tried.  If it keeps up, I may tweek a little, but thank you again for the guidance and time helping me out!

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