Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor

Running rich

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455man:
I have a quadrajet off an 80 or 81 chevy 305 auto truck.  dont have the numbers handy right now.  Carb was rebuilt.  It's on a stock Olds 307 with headers.  No EGR, no AIR pump and tubes were removed.  I have a wideband A/F gauge and it's showing rich.  I got the idle to run about 14.7 but part throttle to WOT is rich.   A/F at part throttle is about 13.0.  WOT it goes to 10.9 then back up to 11.8.  Changed the jets from 72 to 69.  Rods are 50M.  Secondary I went from DP .0686 with N hanger to CZ .0947 with P hanger. I'm thinking my primaries are too rich and need a smaller jet but not sure how small to go.  I thought this carb would work pretty good on this engine. 

Frank400:
To get real help, a carb number would be needed.  Also, when you say "rebuilt", you mean rebuilt by who and what was done to it exactly ?  and what type of parts were put in ?  Do you know that auto parts stores "kits" are junk, as they are not suited to today's new fuel ?  If one of those kits was installed, carb will be very difficult to stay in shape very long.  Sometimes a few hours is all it takes for the rubber parts to swell and become useless.

     The 50M metering rod suggest it's a truck carb, unless parts have been swapped. 

455man:
Carb # is 1708213.  The rebuild was just cleaned and put new gaskets in it.  It was probably a junk kit not sure.  I noticed it has an .135 needle and seat in it.  I put a new accelerator pump in it that is good for ethanol. 

77cruiser:
Power piston hanger didn't get messed up did it? Easy to do. :-[

455man:
I'm not sure.  If it was bent down it would run leaner right?  Anyway to check that?  APT is turned out about 3/4 turns. 

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