How to make a lean mixture
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Junior Member
Joined: Apr 2004
Posts: 22
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From: Mounds View, MN
Car: 1986 Chevy Camaro
Engine: 5.7L 350
Transmission: 700R4
Axle/Gears: 3.42
How to make a lean mixture
I have a 350 with a Holley 650 on it and it runs pretty rich. Is it true that when the air/fuel mixture screws are all the way tightened/in that the mixutre should be lean? What all comes into play in able to get a lean mixture?
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Joined: Jul 2003
Posts: 361
Likes: 0
From: Huntington, West Virginia
Car: 1985 Camaro Z/28
Engine: L69
Transmission: 700r4
Axle/Gears: One-Wheel-WOnder 3.08
If you're still running rich with the idle mixture screws turned all the way in, the screws are not your problem. Possible causes are the fuel pressure(too high), or the float levels(too high). Check your fuel pressure and float levels. Once you have found the problem and corrected it, set the idle mixture screws 2 1/2 turns out and tune from there.
Joined: Mar 2000
Posts: 43,187
Likes: 42
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
You do understand that those mixture screws are for the idle only...
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theshackle
Tech / General Engine
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Sep 17, 2020 08:26 AM
