Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor

17057547 Recipe #1

<< < (2/2)

carmantx:
Ok, that's what I was thinking.  I do more Buick quadrajets than others.  So I have a pretty good feel for them.
You didn't add bypass air did you?
If your mixture screws have no effect, then you have too much in the idle circuits.  You might trying going smaller on the idle tubes for now. 

oktorque:
I'm surprised the oem IDR was .056.  The bleeds were set small, yet the down restriction was so large. 

I wanted to get in the first recipe so I set the IDR to .046, and will set the tubes at .036. Before I change the tubes I'll run it.  I'm trying to understand the function of the IDR.  The tubes suck in fuel from the bowls and it travels up where air is introduced from the idle bleed, then travels through the IDR to the mix outlet.   So, why would Rochester install .056 IDR when the tube is .034 and the bleed is iirc about .062?? 

Very interesting.   

Cliff Ruggles:
Not being able to get the idle speed down is usually a vacuum leak, or the throttle plates not fully seated.  That problem will need fixed first before any tuning can be successful.....Cliff

Navigation

[0] Message Index

[*] Previous page