Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem
off idle stumble
clumsum:
Well I put in the 72 jets and 39 rods and rebuilt the carb with the kit you sent but I'm still getting the stumble. Do you think I still need to richen it up? Should I go with different metering rods? Thanks
Cliff Ruggles:
Remove the triangular shaped cover on top of the airhorn, and gently seat the adjustment screw under it. This will be full rich on the primaries.
72/39 is PLENTY of part throttle fuel for that carburetor number. Make sure the float level isn't too low, seat the upper airbleed screw, and it should be fine....Cliff
clumsum:
--- Quote from: Cliff Ruggles on October 09, 2012, 06:07:49 AM ---Remove the triangular shaped cover on top of the airhorn, and gently seat the adjustment screw under it. This will be full rich on the primaries.
72/39 is PLENTY of part throttle fuel for that carburetor number. Make sure the float level isn't too low, seat the upper airbleed screw, and it should be fine....Cliff
--- End quote ---
Yes, I did that already like we talked about. It still stumbles just as I crack the throttle open no matter what gear I'm in and seems like it runs out of steam at around 4000 rpm. I set the float to 9/32 when I had it apart and replaced the k&n filter with a fram. Could it be a fuel pump issue? What do you think?
Cliff Ruggles:
That's the first place I'd go. With the high flow seat assembly, it shouldn't be sucking the bowl dry at 4000rpm's in that application.....Cliff
73 Z28:
Just out of curiousity, what size engine are you running 350 , 400 or 455?
Are you getting black smoke out of the tailpipe? Do you know what the engine timing is set at?
This info will help to diagnose the problem your having.
Paul
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