Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor

midrange lean

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canadian nascar:
hi Cliff,
i have a modified 81 turbo trans am and i have a lean during half throttle at 2500rpm should i be looking to at more fuel ? how could i do this? or should i be looking to change something on my distributor.

i bought a pair of richer secondary rods from you in july and you told me about the apt.

thankyou kevin

Cliff Ruggles:
When you describe "half throttle", are you on the primary side of the carburetor only?....Cliff

canadian nascar:
i would guess yes, i am new with carbs. i put the throttle down half way as i am driving. and i can tell when the four barrels come on, with a bit more throttle and then it is fine

kevin

Cliff Ruggles:
If it is lean at "heavy" part throttle, the jet size will need increased to richen it up some.....Cliff

canadian nascar:
hi Cliff,

i don't think i was clear, i would say that i am still in the primaries when this happens then if i put it down all the way the lean goes away. would this still mean to change the main jets?

kevin

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