OEM 2002 GMC Envoy Spark Plug

2002 GMC Envoy Spark Plug Parts and Q&A

• Q: How to replace spark plugs in an engine on 2002 GMC Envoy?

  A: It is essential to begin the Spark Plug replacement by first turning off the Ignition Switch and then removing the ignition coils. Wait until the engine temperature sinks to safe levels before taking out spark plugs for protecting the Cylinder Head threads from harm. Use a thread chaser to clean the Spark Plug recess area before new install while also removing any debris from the threads to prevent contamination that will affect plug seating. Replace the spark plugs by using engine-specific spark plugs exclusively because plugs with different heat levels cause severe engine deterioration. A round feeler gauge should be used to check the gap of new and reconditioned spark plugs to verify their fit specifications. A thread chaser should be utilized when installing spark plugs to achieve full seating and prevent cross-threading issues that could result in overheating or thread damage. Sticky substances and paints must be avoided on fasteners because they interfere with their clamping force while only acceptable when suppliers specify their use. Correct fasteners should be installed in designated spots using matching required part numbers. Replace the spark plugs to the engine so tighten them to 18 nm (13 lb ft). After that reinstall the ignition coils.