Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor
17056228 First Test
blazer74:
Went back thru the carb, installed bottom plug kit/with marine epoxy. Replaced needle/seat and vacuum tested. opened up idle tubes to .036 from .035 and installed Cliff's .044 2nd rods. Still using Cliffs .044 primary rods and 72 jets with dark power spring.
Seems to be a little less crisp of idle, but only drove it once could just be me, got caught in rain with full convertible blazer ( was fun tho). Going to readjust mix etc. Have not driven long enough to judge hot start issues which is considerably better with new fuel pump.
Thanks Craig
blazer74:
Went for a run today, ended up turning mix in total of 1 turn and made big difference after opening idle tube from 035 to 036. Will see how it is cold next run.
Question about apt and mixture, relationship between the two. Should adjusting apt lower affect mixture? I've had stumble off idle in the past when apt adjusted too low. If I turn apt lower say 1 turn should I have to readjust mixture? Just a thought. Also went from CH 2nd rods to Cliffs .044 rods, Could be a tad to much on the 2ndarys. Think the CH rods are .054 tips.
Thanks Craig
Cliff Ruggles:
Lowering the APT leans up the primary side at light throttle only. It may develope a hesitation/stumble if you get them too low (lean).....Cliff
blazer74:
Wow been 3 months, Had some issues with wide open throttle, popping and breaking up. Replaced needle/seat and float again, cured most of the problem but had to go 1 full turn on 2nd spring ( new spring). Seems to have cured that. Still have a little hot start issue, have to give it a little gas while cranking but not hard to start like it was. Did have the float every where from 1/4 to 15/32. 3/8 seems to work the best for me.
Ended up with 4 turns ADP, could probably go a little less.
3 turns mix
72 jets, Cliffs primary and 2nd rods
Set up with recipe 1
Thanks again: Cliff ;D
Cliff Ruggles:
WOT problems are usually fuel delivery related, or ignition. Takes a pretty good fuel pump to keep up with a strong running engine.
Glad things are going well.....Cliff
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