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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 973 (Engine Controls - 4.8L, 5.3L, & 6.0L (Introduction)) >> Repair Instructions >> Spark Plug Wire Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the spark plug wire from the spark plug.
    1. Twist the spark plug wire boot a 1/2 turn.
    2. Pull only on the boot in order to remove the wire from the spark plug.
  2. Remove the spark plug wire from the ignition coil.
    1. Twist the spark plug wire boot a 1/2 turn.
    2. Pull only on the boot in order to remove the wire from the ignition coil.
    3. Fig 1: Spark Plug Wire
    GM1239288Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: The Melco® spark plug wires MUST be used only with the Melco® coils and bracket, like wise the Delphi® spark plug wires MUST be used only with Delphi® coils and bracket. The components are NOT interchangeable.
  3. There are 2 different manufacturers for the spark plug wire, ignition coils and coil brackets. They are as follows:
  4. The Melco® spark plug wire (1) will have a blue foil mark on it, and the wire is 145 mm (5.70 in) in length from cable seal to cable seal.
  5. The Delphi® spark plug wire (2) will have a white foil mark on it, and the wire is 110 mm (4.30 in) in length cable seal to cable seal.
    6. Fig 2: Melco® & Delphi® Spark Plug Wires
    GM340933Courtesy of GENERAL MOTORS CORP.
  6. The Melco® (1) ignition coil is a square design.
  7. The Delphi® (2) ignition coil is a round design.
    8. Fig 3: Melco® & Delphi® Ignition Coil
    GM260177Courtesy of GENERAL MOTORS CORP.
  8. The Melco® ignition coil bracket (1) is a square design.
  9. The Delphi® ignition coil bracket (2) is a round design.
    10. Fig 4: Melco® & Delphi® Ignition Coil Bracket
    GM260077Courtesy of GENERAL MOTORS CORP.
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