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JFairman JFairman is offline
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Join Date: Jul 2006
Location: S. Florida
Posts: 7,274
The term "air correction screw" is another word for the idle speed fuel mixture adjustment on a carburator and it does not apply to CIS fuel injection.
You're not correcting air or adjusting mixture you are only adjusting the amount of air available at idle speed.

Weber, Solex, and Dellorto Carbs have an idle air correction or idle mixture screw for each throat along with an individual throttle butterfly stop screw or air bypass screw for setting idle speed and synchronising the individual carburator throats.
Using the wrong term for the idle speed screw is confusing to some people that have heard the term air correction screw before but are not sure what it means..

Idle speed on all fuel injected motors I've seen is controlled by bypassing air around the closed throttle butterfly and the idle speed screw changes the size of the passageway the air goes through in the process. it has NO effect on fuel mixture at idle or any other speed.

Idle mixture is adjusted by the CO adjustment screw and that's right next to the CIS fuel head and no where near the throttle body.
Old 06-04-2010, 04:12 PM
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