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Home >> GMC >> 2004 >> Sierra 2500, 4D Pickup, 4WD, Part Time >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 4.8L, 5.3L, & 6.0L (Introduction) >> Repair Instructions >> Spark Plug Replacement >> Installation Procedure

Installation Procedure

  1. Correctly position the spark plug washer.
  2. Inspect the spark plug gap. Adjust the gap as needed.

    Specification:  Spark plug gap: 1.016 mm (0.040 in)

  3. Hand start the spark plug in the corresponding cylinder.
    NOTE: Refer to Fastener Notice in Cautions and Notices.
  4. Tighten the spark plug.

    Tighten: 

    • Tighten the plug to 15 N.m (11 lb ft) for used heads.
    • Tighten the plug to 20 N.m (15 lb ft) for NEW heads.

    5. Fig 1: View Of Spark Plug And Sparkplug Seat
    GM14824Courtesy of GENERAL MOTORS CORP.
  5. Install the spark plug wire. Refer to Spark Plug Wire Replacement .
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