Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem
454 Quadrajet Question
Ethan1:
--- Quote from: shaferg on February 15, 2013, 01:30:57 PM ---Thanks for letting me know its a remanufactured carb.
--- End quote ---
Oops, my bad. Thought it read replacement, not remanufactured. Totally different.
omaha:
the carb 17083224 is a chevy carb used mostly on chevy/GMC pickups. Nothing wrong with them basically however they were known for being set up very lean with large air bleeds (I think main single air bleed). Also equipped with a rear type pull-off. I don't know of the remanufacturer where you bought it BUT just being remanufactured does not mean that all is right. try to take some measurement of the idle circuit/main circuit specs. Things like air bleeds and various idle orifice dimensions can make a big difference especially on that carb. In the end, you may need to make some modifications. The QJ is the best 4 brl in the world but must be tailored to the specific application that you are using it on. Yes some applications will overlap on stock type builds. This is where the "recipe's" come into play (from the book).
I like your build project.....sweet!!!
shaferg:
Im not sure how to measure idle circuit main circuit specs, but Im sure something is wrong because the engine will turn over and over and not start after a short trip. This has gotten worse over the past 2 weeks. I believe fuel is draining from the bowls somehow or fuel pump is draining back. Is this common? It looks like I need to become a Quadrajet expert but I have to dump some memory as my brain cannot hold info on every moving part of a combustion engine and drivetrain. Thanks for the help.
Ethan1:
If your turning the motor over and over and nothing happens, and your loosing fuel. Sounds like maybe your leaking fuel out of the bottom well plugs.
shaferg:
Leaking plugs are one possibility, Im going to swap my fuel pump from a stocker to a holley to rule out the fuel pump. My gut tells me the ethanol laiden fuel is not making things any better for the rubber components. Could fuel be draining back or leaking out the plugs and what would be a good way to tell? Im still trying to address the drop off in power @ 3500rpms if anyone would like to chime in with theories.
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