Spark Plug: Installation
CAUTION:
It is important to check the gap of all new and reconditioned spark plugs before installation. Pre-set gaps may have changed during handling. Use a round wire feeler gauge to be sure of an accurate check, particularly on used plugs. Installing plugs with the wrong gap can cause poor engine performance and may even damage the engine.
- Gap the spark plugs to the specifications. See SPARK PLUGS under IGNITION SYSTEMS in SERVICE & ADJUSTMENT SPECIFICATIONS - ALERO, GRAND AM & MALIBU article.
- Install the spark plugs to the engine. Tighten the spark plugs to specification. See TORQUE SPECIFICATIONS .
- Install the spark plug wires to the spark plugs. See SPARK PLUG WIRES .
CAUTION:
Ensure plug threads smoothly into cylinder head and is fully seated. Use a thread chaser if necessary to clean threads in cylinder head. Cross-threading or failing to fully seat spark plug can cause overheating of plug, exhaust blow-by, or thread damage. Follow the recommended torque specifications carefully. Over or under-tightening can also cause severe damage to engine or spark plug.