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Spark Plug Usage
Courtesy of GENERAL MOTORS COMPANY
- Ensure that the correct spark plug is installed. An incorrect spark plug causes driveability conditions. Refer to the Electronic Parts Catalog.
- 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