General Category > Quadrajet Carb Talk and Tips

I think I'm running too lean causing high hydrocarbons and low CO's.

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Terry Petty:
It speeds up and smooths out doing the tip-in test.  So can you please sell the the parts to increase the flow of fuel to the idle circuit? 

Cliff Ruggles:
You will need to remove the idle tubes, I'd get replacements as often this leaves them unusable.

The rest will be done with precision drill bits.

I would need to know the size of the upper and lower IAB's and DCR's, plus how much bypass air is being used......Cliff

Terry Petty:
"I would need to know the size of the upper and lower IAB's and DCR's, plus how much bypass air is being used......Cliff"

Every post you stump me even more.

Is and "IAB" an "internal air bleed"?  What's a "DCR"?  How do I measure how much bypass air is being used?

Cliff Ruggles:
IAB:  Idle Air Bleeds
DCR:  Down Channel Restrictions

All items related to airbleeds, idle tubes, DCR's, bypass air, etc are measured with precision drill bits.

Might be time to get one of our books so you can learn how the idle system works and how the related parts control and effect idle fuel delivery to the engine.

Placing your hand over the carb or "tipping-in" the choke flap and seeing an improvement tells you that it needs more fuel at idle.  If you can't duplicate that scenario with the idle mixture screw the carburetor needs modified to put more fuel to them at idle.......Cliff

Terry Petty:
Sounds like a plan, thanks Cliff

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