Spark Plug Usage

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. See IGNITION SYSTEMS in SERVICE & SPECIFICATIONS - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article. Ensure that the spark plug has the correct heat range. An incorrect heat range causes spark plug fouling (colder plug), pre-ignition, causing spark plug and/or engine damage (hotter plug).