Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor

Lean idle

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53Olds:
Drilled the idle mixture screws passages out to .090", the DCR holes to .0595".

Seems to have solved the lean problems.  :)

It now idles nicely at 650-700 rpm, good idle mixture control with the mixture screws (now at three turns), no sign of leanness.

I've changed the vacuum to the distributor to ported vacuum, rerouted a couple vacuum lines, and bumped the initial timing up to 8 degrees. So far, so good.

Cliff Ruggles:
Good news.  .059" is fine for DCR's on that carb.  I would not go any larger with the holes under the mixture screws......Cliff

Timothytuh:
Sounds like the primary to me too. If boost is not lean then you are getting fuel. Could be the FPR too? Maybe its letting too much by at idle? Do you have any way to reading fuel pressure?

Do you have the dual stage injectors or are both the same ccs?

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