Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor
17059272 on a ford 300
Cliff Ruggles:
Thanks....Cliff
F250 Restorer:
I haven't addressed the lean idle issue yet, but soon will, work permitting.
There is one other issue I need to ask about: I really enjoy the QJ, but have noticed I'm getting only 7.8 miles per gallon, driving a mix of 80% street, and 20% freeway. Maybe I got on it a couple of times while getting on the freeway, but mostly I'm driving conservatively. I know that mpg can't be correct, and need some feedback regarding how to raise that mpg.
It's not smoking. Choke opens completely. The only vacuum line not plugged is the dizzy advance.
Cliff Ruggles:
Yikes, should be getting nearly double that mileage. I owned a 79 Blazer with a 400 SBC making over 350hp, TH350, and 3.08 gears that got 15mpg's with a q-jet on a stock intake.
Something isn't quite right someplace, I'd expect at least 11-12 mpg combined city/highway and closer to 14-16 highway mileage.
Have you done a "tip-in" test with the APT screw? Set it for 100-150rpm's increase when the choke flap it tipped in slightly. This will be slightly lean, but should delivery good mileage.....Cliff
F250 Restorer:
Thanks. I'll try it.
I don't have the throttle response I was expecting. As you suggested with climbing a hill, when I'm climbing and hit the gas at 30, it just seems sluggish. Is that a sign of too big a pri. jet?
Cliff Ruggles:
Climbing a hill and "hitting the gas" puts the metering rods on the tips. Assuming you are staying on the primaries, the 72 jets may be slightly lean in that carb number. We usually set those up with 73 main jets, and 44 tapered metering rods.....Cliff
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