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Home >> GMC >> 2002 >> C3500 HD 8.1 G, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 8.1L >> Repair Instructions >> Spark Plug Replacement >> Removal Procedure
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Removal Procedure

  1. Remove the spark plug wires. Refer to Spark Plug Wire Replacement .
  2. Loosen each spark plug one or two turns.
  3. Brush or air blast away any dirt from around the spark plugs.
  4. Remove the spark plugs one at a time and place each plug in a tray marked with the corresponding cylinder numbers.
    Fig 1: Spark Plug
    G01599005Courtesy of GENERAL MOTORS CORP.