OEM 2005 Cadillac STS Spark Plug

2005 Cadillac STS Parts Questions & Experts Answers

• Q: How to replace spark plugs safely and effectively on 2005 Cadillac STS?

  A: Start by taking out the ignition control modules then eliminate dirt from the Spark Plug recess area using low-pressure air system while wearing protective safety glasses for air particle protection. Before removing the spark plugs it is essential to clean the recess area to stop foreign materials from entering the Cylinder Head because contamination might damage plug threads; a thread chaser () helps remove the contamination from these threads. You should wait until the engine cools down completely before extracting the spark plugs to stop the threads from seizing up because thread damage to the Cylinder Head might occur. Elementarily examine the spark plugs once they are removed from the engine. Check the new Spark Plug gap according to specifications and confirm the vehicle requires plugs of the exact specification because using hotter or colder plugs could seriously harm the engine. All new and reconditioned spark plugs need a round feeler gauge inspection to check their gaps because pre-set gaps might shift during handling; improper gaps result in poor engine performance and potential damage. Put the spark plugs inside the cylinder heads where they should enter the threads then completely set before using a thread chaser tool (if needed) for thread cleaning. Reinstall the ignition control modules after tightening the spark plugs to 20 n.m (15 lb ft).