OEM 2003 GMC Envoy Spark Plug

2003 GMC Envoy Spark Plug Parts and Q&A

• Q: How to replace spark plugs in an engine on 2003 GMC Envoy?

  A: The first step to replace spark plugs includes switching off ignition power while removing the ignition coils from the vehicle. Spark Plug replacement should start only after the engine achieves full cooldown since hot removal can damage Cylinder Head threads through plug thread seizure. Maintain the cleanliness of the Spark Plug recess by removing foreign content which leads to thread impurities that obstruct new plug seating; employ a thread cleaning tool. The engine requires spark plugs from its specifications list since using different heat levels in replacement plugs can cause severe engine damage. You should measure the gap of both new and reconditioned spark plugs using round feeler gauges before assembly because the initial gap might have changed after being handled; ensure to verify the established specifications and correct the gap accordingly. The Spark Plug should pass through the Cylinder Head with smooth motion while achieving complete sitting position by using a thread chaser for thread cleaning if necessary. A complete seat of the Spark Plug combined with proper thread alignment will stop overheating and exhaust blow-by and thread damage. Install the fasteners at their intended locations by using the correct components and resisting paint or lubricant or corrosion inhibitor application unless required specifications allow their use since these materials may alter torque forces. Tighten the spark plugs to 18 nm (13 lb ft) using the engine as the installation location before adding the ignition coils.