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What is the procedure for setting the air/fuel mixture using a vacuum gauge?

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Old Feb 21, 2006 | 11:15 AM
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What is the procedure for setting the air/fuel mixture using a vacuum gauge?
Can anyone explain the procedure for setting air/fuel with a vacuum guage? I've never done it this way but I've heard it mentioned in the forums.

Thanks.
 
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Old Feb 21, 2006 | 11:44 AM
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It's pretty simple. Get the enigne warmed up/choke off. At idle in neutral hook the gauge to a full time vacuum port using a tee. Adjust each idle mixture screw very slowly to max vacuum. You may want to go back and forth a rew times to get it maxed out. Some people will also do it again in gear with someone holding the brake if you have an automatic.
 
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Old Feb 21, 2006 | 11:47 AM
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i'm just curious, what does it change when you have the truck in gear.
 
Last edited by nebechanezer; Feb 21, 2006 at 11:50 AM.
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Old Feb 21, 2006 | 11:50 AM
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Thank you
Thank you Gentlemen. I appreciate the help.
 
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Old Feb 21, 2006 | 01:38 PM
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i'm just curious, what does it change when you have the truck in gear.
it places a load against the motor and therefore drops the idle speed- affecting the vacuum reading at the same time..
 
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Old Feb 21, 2006 | 02:12 PM
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Set the number of turns on the air / fuel mixture screws evenly. Such as 3 1/4 turn set out on each a/f screw, while maintaining the highest vacuum reading possible.
 
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Old Feb 21, 2006 | 02:19 PM
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The highest vacuum method works for the most part but it may not be optimal for driveability. You may need to go slightly rich. -Just my 2¢
 
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Old Feb 21, 2006 | 02:46 PM
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Originally Posted by Torque1st
The highest vacuum method works for the most part but it may not be optimal for driveability. You may need to go slightly rich.
By "slightly rich" do you mean 1/4 turn out...1/2 turn out?
 
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Old Feb 21, 2006 | 03:55 PM
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Rev your engine and check for a dead spot on the acceleration, then go out a 1/4 turn if you feel the engine should needs it, rev the engine and check if the engine response has improved.
 
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