Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

454 Quadrajet Question

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shaferg:
Hello all, I just recently completed building this bbc and putting it back in my 93 nissan  300zx.       Heres the build-------->>>>   .http://forums.nicoclub.com/454-powered-300zx-t485062.html
The issues I am having are: 1.Engine will not run by itself on the fast idle cam without a sligt throttle blip which most times brings it off the fast idle and on to the regular cam and I have to hold the throttle until warm. It will also idle very low sometimes(500-600 )after warmed up and at a light in gear. Sometimes will idle at 900-1000 as set.
    2. Engine seems to flatten out power wise at about 3500 rpms and when floored(wot) will sometimes fall flat on its face, surge then even out.
I have read Cliff's book 4 times to try and understand Quadrajet function but the info is sort of overwhelming.

Engine specs: 454 bored .060 over
                     Pass heads
                     Flat top pistons
                     cam 513 lift, 230 duration @.050
                     200-4r transmission
                     4.08 rear
                     

omaha:
   Ok, What is the carb number. what  are the carb specs. I know that certain QJ's would be a bad choice for that engine in their  stock configuration, how ever, the majority of them can be made to work if the casting is useable. I wil assume that you will need a fair amount of fuel at idle and maybe bypass air.  All hinges on what carb number you have on it right now.

shaferg:
There are multiple numbers on the carb, but the air horn number is 17083224. I bought the carb remanufactured from National Carb in jacksonville florida. Claimed flow is 795cfm

Ethan1:
 That is a remanufactured carburetor. A lot people have problems with them right out of the box. :(

shaferg:
Thanks for letting me know its a remanufactured carb.
--- Quote from: shaferg on February 15, 2013, 09:50:45 AM ---There are multiple numbers on the carb, but the air horn number is 17083224. I bought the carb remanufactured from National Carb in jacksonville florida. Claimed flow is 795cfm

--- End quote ---

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