Ford 2.3 / LRG-423 — Idle Mixture Adjustment (Holley Model 1940)
Adjustments
For the Ford 2.3 / LRG-423, from the Ford service manual.
Applies to: Ford LRG-423 engine
Procedure
- Run engine 5-10 minutes at a fast idle speed or until normal operating temperature is reached.
- With engine off, turn idle mixture adjustment screw in until lightly seated, then back out two turns.
- Start engine. Turn screw in until engine begins to run rough or stumble due to a lean mixture.
- Slowly turn needle out until engine begins to roll due to a rich mixture.
- Slowly turn needle in to a point between the two extremes until engine runs smoothly (favor a slightly rich setting).
Full service-parts list: Ford LRG-423 engine →
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.