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Home >> GMC >> 2004 >> Sierra 2500, 4D Pickup, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (Engine Controls - 4.3L (Introduction)) >> Repair Instructions >> Spark Plug Replacement >> Installation Procedure

Installation Procedure

WARNING: This page is about a different variant/trim than selected.
  1. Ensure that the spark plug washer is positioned correctly.
  2. Inspect the spark plug gap. Adjust the gap as needed.

    Specification:  Spark plug gap: 1.524 mm (0.060 in)

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

    Tighten: 

    • For used heads, tighten the plug to 15 N.m (11 lb ft).
    • For new aluminum heads, tighten the plug to 20 N.m (15 lb ft).
    • For new iron heads, tighten the plug to 30 N.m (22 lb ft).

    5. Fig 1: View Of Spark Plug And Sparkplug Seat
    GM14824Courtesy of GENERAL MOTORS CORP.
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