Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem
Does this sound lean?
Cliff Ruggles:
The APT system on that carburetor was in the baseplate, between the idle mixture screws. The power piston should have a steel post on the bottom of it to engage the APT.
In almost all cases the entire system is removed when those carburetors are commercially "remanufactured".
Getting back to the original question, it would be quite lean for the application at heavy/WOT, based on teh specifications provided......Cliff
Marx3:
There are no wigns of that type APT either...
But, okay, so if I re-set everything to recipe 1, than the vette should be good to go right?
Cliff Ruggles:
If the APT system is completely missing, then it's a commercially remanufactured unit, and probably a bunch off miss-matched parts with a generic calibration.
I hate to see those coming, as they are the most labor intensive to repair. I'd take it back to the factory configuration close to what a 1969 SBC q-jet used. .050" main airbleeds at both locations, .068" main jet, rod about 30 numbers smaller, "B" series, AX, CE or DA secondary rods, idle system from recipe in our book to match the engine combination.....Cliff
Marx3:
I really think the baseplate looks like it is newly made, you know, the casting ust looks a little different from an old baseplate.
The body has holes for bypass air, should I go through the process and drill the baseplate etc? Or is it not necesary for a close to stock vacuum-level?
I will email you about rods etc I might need, when I get to rebuilding it.
Thanks alot!!!
Cliff Ruggles:
In any and all cases, the carburetors calibration/fuel curve must be matched exactly for the application, if you want the best results in all areas.
This seldom comes from anything purchased commercially remanufactured/rebuilt (good news for us here!), so fully expect to have to do some tuning in one or more areas to get it up to par.....Cliff
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