OEM 2004 GMC Envoy Spark Plug

2004 GMC Envoy Parts Questions & Experts Answers

• Q: How to replace spark plugs safely and effectively on 2004 GMC Envoy?

  A: The first step for Spark Plug replacement involves removing ignition coils while wearing safety glasses as protection against flying dirt particles. Clean the Spark Plug recess area thoroughly to block foreign matter from entering the Cylinder Head because it may harm engine parts and pollute threads so the new plug cannot fit correctly; thread cleaning tools will help eliminate contamination from threads. Spark Plug thread damages of the Cylinder Head can be prevented by waiting until engine cooling occurs before plug extraction. Check the condition of all removed spark plugs. The vehicle requires its exact spark plugs because substituting hotter or colder plugs will lead to severe engine damage. The replacement and new Spark Plug gaps must match the specifications following a check with a round feeler gauge after plug handling operations. The Cylinder Head Spark Plug installation requires smooth thread insertion with complete seat by using a thread chaser to prevent both threading issues along with heat problems and exhaust leakage and threaded structural deterioration. Tighten spark plugs within 18 n.m of torque (13 lb ft) after installing them into the Cylinder Head before reinstalling ignition coils.