Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor
Poor Fuel Mileage on 4.3 V6 with Quadrajet 17056250
don3194:
Alright, I found another good looking cheap quadrajet and I think this is like one that you suggested. Its a 17059222, I don't think its off of a truck and couldn't tell if it was single airbleed or not, but some quick searches on google found people saying it was a good one. Thanks again.
Kenth:
17059222 is a good unit.
I would start with mounting .050" inserts in the current .120" main airbleeds, keep the original #71 jets and 40K rods. Set APT at 4.5 turns up from bottom then use "tip-in" to check/adjust.
Opening the .033" idle tubes to .036"-.038" will help the engine idling.
Optional, if off-idle hesitation occurs, would be to open DCR´s from .050" to .055" and the .080" idle needle holes to .095".
don3194:
Kenth are you referring to starting off on the 1709222? I just wanna make sure. Also if I do more reading up in Cliff’s literature will I find the meanings of some of the things you said. I’m not very familiar with Quadrajet’s or really any more recently designed automotive carburetor. I’ve only worked on a One Barrel off of a 1951 pickup before this one. I know APT, but I don’t know the “tip-in” method or DCR or how to do some of that stuff.
Cliff Ruggles:
The modifications Kenth describes help the later emission calibrated carburetor get adequate fuel to the engine.
Those are large MAB models and that particular one is set up pretty lean, but it's easy to tune and will work a lot better everyplace than the carb it is replacing.
If you call me at the shop next week I can set you up with what you need so it's pretty much "plug and play" for what you are doing......Cliff
don3194:
Alrighty, thanks again Cliff.
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