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Spark Plug Usage

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ensure that the correct spark plug is installed. An incorrect spark plug causes driveability conditions. Refer to Ignition System Specifications  for the correct spark plug.
  2. Ensure that the spark plug has the correct heat range. An incorrect heat range causes the following conditions:
    • Spark plug fouling-Colder plug
    • Pre-ignition causing spark plug and/or engine damage-Hotter plug
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