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Home›Repair guides›Ford›Compression Test

Ford 2.3 / LRG-423 — Compression Test

Testing & diagnosis

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

Applies to: Ford LRG-423 engine

Procedure

  1. Make sure oil in crankcase is of the correct viscosity and at proper level, and battery is properly charged.
  2. Operate the engine until it is at normal operating temperature; turn off ignition, then remove all spark plugs.
  3. Set throttle plates in wide-open position.
  4. Install a compression gauge in No. 1 cylinder.
  5. Install auxiliary starter switch; crank engine at least five compression strokes and record highest reading.
  6. Repeat test on each cylinder, cranking approximately the same number of compression strokes.

Tools required

  • Compression gauge (Rotunda Compression Tester 059-R0009) Amazon
  • Auxiliary starter switch Amazon

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

Specs & values

  • Lowest reading cylinder must be within 75 percent of the highest

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 →