Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

Car will not accelerate under load, sometimes backfires

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kirkp:
Ok, that's what the problem was.  The rich stop was all the way down against the solenoid plunger. I made a tool out of a piece of 3/16" brake line to turn the screw out until it seated.  Then I set it to 4/32" of travel.  The tool I made by cutting a piece of 3/16" brake line with a tubing cutter then tapping the cut end gently over the screw.  I made a short piece the same way to hold the screw in place.  Only thing additional I did with the short piece was squeeze the upper part of the line with vice grips to flatten it just enough to fit tight in the hole.  Then I gently tapped it in until it seated.  Hopefully that will hold the screw from moving.  My only question now is the lean stop.  I have the travel set, but am I setting that off of a good lean stop setting.  I set the lean stop setting to what it was when I took the carb apart.  Obviously someone has been tinkering with this carb and I do not know if the lean stop is set correctly

Cliff Ruggles:
For sure that rich stop is WAY too low.

I usually set them at the max-rich position for initial testing.  Seldom do you have to bring them down very far for the best final adjustment.......Cliff

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