Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor
Poor Fuel Mileage on 4.3 V6 with Quadrajet 17056250
Cliff Ruggles:
Are you saying that you swapped baseplates during the rebuild using one from another carburetor part number?....
don3194:
Well I think so, I don’t know what number it came off of.
I swapped it because I discovered that the one from the 17059222 was actually cracked around the primary shaft and very worn out on the secondary shaft. I thought I could just try it and hope those holes didn’t make a difference. I don’t think it did, but obviously it’s developed a vacuum leak somewhere and it could be related.
Cliff Ruggles:
It's supposed to be loose on the secondary side as the large throttle plates need some room to seal in the bores each time they close.
A crack means it was dropped at some point and doesn't hurt anything. Using my bushing install kit you can bore in deeper to install a bushing. I've done hundreds of them that were cracked and even had a chunk missing out of them.
In most cases the shaft is also bent and will need a little "tweaking" after the bushings are installed....
don3194:
When I say loose, I mean that the secondary shaft moves enough so the throttle plates will actually stick in the bores until the primaries reach wide open throttle, then they fly open.
don3194:
Upon some inspection I noticed that the gasket is not sealing the the middle, I can see where the gasket has been crushed in most of the areas but right in the center I can see where the air is seeping passed. Its right in-between the two primary bores. The gasket has no witness marks of being crushed but lines where I could see the air. I’m not too sure how to resolve this issue but neither baseplate seals it.
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