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Old 09-19-2012, 08:58 PM
luckynumberslevin luckynumberslevin is offline
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Fuel haze and rich idle problem

Hey everybody,

I recently installed a QFT 650 cfm carb on my 355 chevy and im having some idle issues. The carb is a chokeless race carb with 4 corner idle.
The engine:

355 small block chevy, aluminum angle plug heads
Victor jr intake
Comp 280R solid roller cam 242/248@.050
11:1 compression,
12deg base timing with no vac advance.

the question i have, when the engine is warmed up idling it lets off a grey fuel haze and smells really rich. the AF meter that i have hooked up shows about 11.5:1 A/F. Neutral idle is 1100 rpm and when dropped in gear against a 3200 stall converter it drops down to about 800 rpm.

When driving the A/f stays rich, and wot wit 10:1 A/f.

when sitting at lights in gear or neutral their is always a haze of grey around the truck. So my question is, what tune is off, or how do you tune the idle of a 4 corner carb?
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