OEM 2004 Cadillac CTS Spark Plug

2004 Cadillac CTS Spark Plug Parts and Q&A

• Q: How to replace spark plugs safely and effectively on 2004 Cadillac CTS?

  A: The essential equipment for Spark Plug replacement includes the Spark Plug centering sleeve (J 42068) among other tools. Begin the task by removing ignition coils and protect your eyes with safety glasses for avoiding dirt particles. Using low-pressure air clean the Spark Plug recess area to stop dirt or foreign material entry into the Cylinder Head because this could harm the engine or contaminate Cylinder Head threads thus the new plugs may not fit properly. A thread chaser must be used to eliminate any pollutants from the thread area. Secure the Spark Plug centering sleeve (J 42068) onto a 3/4 extension to shield the Spark Plug socket from possible damage that would crack the insulator of the plug. Warming up the engine first is essential else the plug threads may freeze up and become damaged. Look for signs of damage on the removed spark plugs then use a round feeler gauge to verify all new and reconditioned spark plugs have correct gaps since personnel handling can alter them. Operators should install factory-specified spark plugs on their vehicles since engine damage occurs when non-matching plugs of different temperature levels are used. A thread chaser helps secure complete plug seating into the Cylinder Head while preventing cross-threading or overheating and thread damage so take appropriate measures if necessary. Fit the spark plugs into the cylinder heads before tightening them to 25 n.m (18 lb ft) then install all ignition coils.