Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

Big cam, stinky rich idle

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dave at hsp:
Something like that, yes.
The centrifugal advance starts to come in early and is all in at 3500 rpm, so the timing never really backs up much.
What you say does make sense and I'm gonna give it a try this weekend. I'll let you know what happens.
 I've been doing it this way so long, maybe it's time for a change.
Thanks!
Dave

77cruiser:
Not necessarily the idle tubes, but could be. How far out did you have the mixture screws? Did you open up the holes for the mixture screws?

dave at hsp:
Jim, I had the mixture screws out about 3/4 of a turn. 
I opened the screw holes to .106 from .096.

UPS just dropped off a box of long drill bits from MSC.
So I guess I'll be drilling the idle tubes some more this weekend. I'm gonna go a little bigger on the bypass holes in the base plate too. Unless anyone has a better idea.
 It's pretty close, but could still be closer.

Thanks!
Dave

77cruiser:
3/4 of a turn was thinking should be out 3 or 4 full turns. Maybe more try that first.
Set idle to best idle or highest vacuum.

dave at hsp:
3/4 of a turn WAS the best idle and highest vacuum.

Dave

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