Spark Plug Replacement Procedure

Step 1: Engine Preparation

• Ensure the engine is completely cool before starting work
• Remove engine covers or other components blocking access to spark plugs
• Clean the area around spark plugs to prevent debris from falling into cylinders

Step 2: Remove Ignition Coils

• Disconnect the negative battery terminal for safety
• Label and photograph coil connections if necessary
• Carefully disconnect and remove ignition coils

Step 3: Remove Old Spark Plugs

• Use a spark plug socket with rubber insert to remove old plugs
• Remove one plug at a time to avoid confusion
• Inspect removed plugs for signs of engine problems

Step 4: Gap Check and Installation

• Check gap on new spark plugs using a gap tool
• Adjust gap if necessary to manufacturer specifications
• Thread new plugs by hand initially to avoid cross-threading
• Torque to manufacturer specifications using a torque wrench

Step 5: Reassembly

• Reinstall ignition coils and secure connections
• Replace any removed engine covers
• Reconnect battery terminal

Step 6: Testing

• Start engine and check for proper operation
• Listen for any unusual sounds
• Check for check engine light

Note: This procedure may vary depending on vehicle make and model. Always consult your vehicle's service manual for specific instructions and torque specifications.

Recommended Service Interval:Most manufacturers recommend replacing spark plugs every 30,000 to 100,000 miles, depending on the type of spark plug and vehicle specifications.

Warning:Improper installation can lead to poor engine performance, reduced fuel economy, or engine damage. If you're unsure about performing this maintenance, please consult our professional technicians.