Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

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

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jxu109:
When the outside temp is below 50-55 degrees, I have an off-idle stumble, and a lazy spot on light-medium acceleration, no matter what the engine temp.

As soon as it's warmer than 55 or so, it's a completely different experience.  It runs perfect all across the board.  No more stumble, and no more lazy spot on acceleration.

It sound like I'm running a bit lean?  But where, and how do I correct it? 

Thanks

Cliff Ruggles:
What is the carburetor part number, application, and have any modifications been done to the engine and/or carburetor?.....Cliff

jxu109:
17057204AYN
1367

68 C10 2wd
Super T-10 4 speed
3:73 rear, 275/60/15
350 ci bored .030,
 ~10:1 compression,
Comp Cams 270H 
Performer RPM Heads,
Performer intake
MSD digital E-curve Distributor
Thorley Tri-Y's,
 Magnaflow x-pipe and mufflers.

The carb has been modified and re-built.  I'm not sure what modifications were done.

Thanks

Cliff Ruggles:
Difficult to help out unless the specific modifications to the carb are known.

My guess, it still uses the HUGE main airbleed set-up.  It is difficult if not near impossible to get those to work no matter how much jet you install in them.

My advice, recalibrate it according to the correct "recipe" in our book, exactly, in all areas......Cliff

jxu109:
Can you suggest one?  As far as I remember, there was a pretty mild build, and then something with a pretty wild cam.  I thought when reading that my build fell somewhere in the middle of those 2.

Thanks.

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