OEM 2007 Cadillac STS Spark Plug

2007 Cadillac STS Parts Questions & Experts Answers

• Q: How to replace a spark plug safely and effectively on 2007 Cadillac STS?

  A: Follow these steps to replace a Spark Plug: unplug the Ignition Coil while the ignition remains off and protect eyes with safety glasses while handling compressed air. The owner needs to clean the Spark Plug recess location to stop contaminants from affecting the Cylinder Head where they might harm the engine and possibly block the new plug from seating correctly. Use a thread chaser (Tool Required: Use a thread chaser (Tool Required: Thread Chaser) to clean any contamination existing on the threaded surface. Clear the Spark Plug cavity using compressed air before the engine cools down properly since removing hot plugs can cause thread seizure damage to Cylinder Head threads. When changing spark plugs avoid using those with different heat ratings because using the wrong plugs may harm your engine beyond repair. Before installation check the spark plugs' gaps with a round feeler gauge to verify accuracy as gaps from handling and pre-setting can vary. The correct Spark Plug gap needs to match exactly what the manufacturer specified for that plug. A thread chaser helps you achieve proper Spark Plug seating when threading the plug into the Cylinder Head. The thread chaser prevents overheating, exhaust blow-by, thread damage while avoiding cross-threading. Whenever possible use a round feeler gauge to measure the Spark Plug gap. Tighten the new Spark Plug to 20 n.m (15 lb ft), before reinstalling the Ignition Coil.