OEM 2009 Cadillac XLR Spark Plug

2009 Cadillac XLR Spark Plug Parts and Q&A

• Q: How to replace spark plugs in an engine on 2009 Cadillac XLR?

  A: The first step to replace spark plugs consists of shutting off the ignition while removing both sets of Ignition Coil assemblies. The engine needs to cool before work starts since removing hot spark plugs may lead to thread seizure that damages the Cylinder Head threads. After cleaning the Spark Plug recess area make sure to utilize a thread chaser before new plug installation since contaminating the head threads can obstruct proper location of new plugs. Check all spark plugs after extracting them from the engine. The correct engine components for the vehicle need to be used since improper plugs either hotter or colder than specified damage the engine. A round feeler gauge must check the gap of new and reconditioned spark plugs before installation since pre-set gaps might alter during handling and wrong gap settings may cause engine performance problems or engine damage. Compare the measurement of the Spark Plug gap to manufacturer specifications before making adjustments when needed. The installation requires a smooth thread insertion into the Cylinder Head until the plug achieves total seat position and requires a thread chaser to clean the way. Secure each Spark Plug into the engine by torquing it to 15 nm (11 lb ft) while putting back both Ignition Coil assemblies.