Ford — Idle Mixture Adjustment
Adjustments · Carburetor
From a Ford service manual covering: 140 CID, 2.3 LITRE, 2300 cc, LSG-423. Check it applies to your exact model before use.
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Procedure
- With air cleaner in place, run engine 5-10 minutes at fast idle or until normal operating temperature.
- Make sure engine idle speed is at specification.
- With engine off, turn idle mixture screw in until lightly seated, then back out two turns.
- Start engine; turn screw in until engine runs rough or stumbles due to lean mixture.
- Slowly turn needle out until engine begins to roll due to rich mixture.
- Turn needle in to a point between the two extremes until engine runs smoothly; favor a slightly rich setting.
- Recheck idle speed and adjust if necessary.
Tools required
- Tachometer Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
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.