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Home›Repair guides›Ford›Idle Speed Adjustment (Holley Model 1940)

Ford 2.3 / LRG-423 — Idle Speed Adjustment (Holley Model 1940)

Adjustments

For the Ford 2.3 / LRG-423, from the Ford service manual.

Applies to: Ford LRG-423 engine

Procedure

  1. Run engine 5-10 minutes at fast idle or until normal operating temperature is reached.
  2. Connect a tachometer to the engine.
  3. Turn the idle speed screw until engine speed is at specifications (in to increase, out to decrease).
  4. After each adjustment, pull back on the throttle lever and release; engine speed should increase then return to normal.

Tools required

Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.

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.

More Ford repair guides →