Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

Runs great, unless it's less than 50 deg. outside.

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jxu109:
I used everything from the new carb, except the throttle plate.  This new one has the single bleed in the air horn.

The primary side feels much stronger than with the old carb...

I lost the 'holy crap' effect my secondaries used to have though, but I did use the same secondary rods and hanger.

Also, the old carb had some passages  plugged on the outboard side in the main body -- does this sound familiar, and should I do it to the new one too?

I'm thinking the best thing to do to get the secondaries back to the way they were would be to start measuring the holes in the old one, but I wasn't clear on which passages were for the secondaries.

Thanks again!

jxu109:
I'm starting to wonder if the secondaries feel weaker to me because the primary side is working so much better.

I took some tension off the air flap, and it made a difference, but overall, it still seems like the secondaries aren't coming in as strong as they did with the previous carb.

The only other thing I can think of doing is modifying the pull-off.... it's about 2.5 seconds as of now.

jxu109:
Here's a pic of the hole that was plugged on the old one -- why was this done?

Cliff Ruggles:
Those are the idle air bypass passages in the main body.  These were plugged by companies who intalled "generic" calibrations into q-jets during commercial remanufacturing.....Cliff

jxu109:
That would make sense.  It came from JET, but I know better now.

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