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Old 08-25-2019, 09:17 PM   #1
gmvette
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Default Rich Quick Fuel at idle

Quick fuel 750 CFM with 4 position idle screw adjustment. And the problem is too rich at idle exhaust smell/eyes burn is terrible, plugs are black. The throttle plates closed so very little of transitional (.025”) slots show. Secondaries almost no transitional slots showing. Idle is about 750 - 800 RPM’s. I reset the floats so at bottom of windows in order to lean it out. Not sure it helped. Idle screws are at 1 1/4 turns out (all 4) and seems to run nice there. Good adjustment on screws. I feel 427 BBC with initial timing at about 12 degrees will not idle any less than 750 - 800 RPM’s. Stars up nice. Vacuum is 15 and has the stock 6.5 PV. Same rich condition with vacuum advance or not.

Any other suggestions to lean the idle circuits more?

What would closing the secondary idle screws do? I haven't tried screws under 1 turn out but may need to open throttle plates if I did to keep it from stalling.
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Old 08-25-2019, 09:34 PM   #2
Rick_L

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What would closing the secondary idle screws do? I haven't tried screws under 1 turn out but may need to open throttle plates if I did to keep it from stalling.
Turning the idle mixture screws in should lean out the mixture. If your plugs are black it should improve things. If anything you may need to close the throttle more or just put up with a higher idle speed. You could always do something else to lower idle speed, like reduce the ignition timing.

You don't have anything to lose, if it's worse you just put it back.

I've run some Holleys with the idle mixture screws all the way in. That in itself is no big deal.
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