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Home >> Land Rover >> 2022 >> Defender 90 S >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 35 (Engine Ignition - V8 S/C 5.0L Petrol -- Defender/L663) >> Engine Ignition - V8 S/C 5.0L Petrol >> Diagnosis And Testing >> Engine Ignition - V8 S/C 5.0L Petrol (G1222443) >> Ignition Coil And Spark Plug Diagnostics >> Spark Plugs

Spark Plugs

WARNING: This page is about a different variant/trim than selected.
  1. The spark plugs are installed in the cylinder head below the ignition coils. If no issues were found with the ignition coil checks, inspect the spark plugs. Check for the following:
    1. Check the spark plug of the affected cylinder for security in the cylinder head. Refer to: Engine Ignition - V8 S/C 5.0L Petrol - Specification - For the correct torque
    2. Remove the spark plug of the affected cylinder and check the ceramic insulator for damage, cracks or evidence of tracking. Replace the faulty spark plug as necessary. Refer to: Engine Ignition - V8 S/C 5.0L Petrol - Removal and Installation - Spark plugs
    3. Inspect the spark plug center electrode for excessive wear. Replace the faulty spark plug as necessary. Refer to: Engine Ignition - V8 S/C 5.0L Petrol - Removal and Installation - Spark plugs. If the center electrode is not worn, check the electrode gap and adjust as necessary before reinstalling the spark plug
    4. If there are no visual faults with the spark plug from an affected cylinder, swap the spark plug with one from a known good cylinder and retest. If the issue has changed cylinder, replace the faulty spark plug as necessary. Refer to: Engine Ignition - V8 S/C 5.0L Petrol - Removal and Installation - Spark plugs
    5. If there are no issues found with the ignition coils or spark plugs, REFER to: Electronic Engine Controls (303 Electronic Engine Controls - V8 S/C 5.0L Petrol, Diagnosis and Testing) and check other powertrain components
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