OEM 2009 Cadillac STS Spark Plug

2009 Cadillac STS Parts Questions & Experts Answers

• Q: How to Properly Replace a Spark Plug on 2009 Cadillac STS?

  A: The Spark Plug replacement process should start by turning ignition off then removing the Ignition Coil from bank 1 (LP1, LY7) or bank 2 (LP1, LY7). You must wear safety glasses together with appropriate caution for compressed air usage. Cleaning the Spark Plug recess area will enable the prevention of foreign material from entering the Cylinder Head. Use a thread chaser to remove all contaminants from the threads. Safety goggles become essential while using compressed air to eliminate debris from the Spark Plug cavity before proceeding because hot engines can make the plug threads seize. Use only the stipulated spark plugs since using alternate ones with higher or lower temperatures will lead to engine damage. Perform gap inspections of every new and refurbished Spark Plug through the usage of a round feeler gauge because improper gaps can result in engine deteriorating performance and potential damage. Check the Spark Plug gap matches its specification while monitoring that the plug inserts properly into the Cylinder Head until complete seating; a thread chaser should be used to prevent either cross-threading or incomplete seating that could result in overheating or thread damage. The technician should install the Spark Plug by tightening it to 20 nm (15 lb ft) and reattach the Ignition Coil for bank 1 (LP1, LY7) or bank 2 (LP1, LY7).