Ford — Idle Fuel Mixture and Idle Speed Adjustment

Adjustments · Variable venturi carburetor

From a Ford service manual — check it applies to your exact model before use.

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Procedure

1. With air cleaner installed, operate engine at fast idle until normal operating temperature; disengage any load.
2. Be sure choke linkage is all the way in to the off position.
3. Set throttle at minimum speed; idle speed screw must contact throttle lever.
4. Turn idle speed adjusting screw in or out to obtain 800 rpm.
5. Turn idle mixture screw inward until engine speed drops (lean), then outward until speed drops (rich).
6. Turn screw inward to a point between the extremes for maximum smoothness and rpm.
7. Reset idle speed to the smoothest point within 750-850 rpm.

Source: Ford service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.

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