Installation and Fault Finding

Removal and installation

EMS Caution UK

1. Disconnect the connector from the faulty Ignition Coil. Remove the screw(s) and faulty Ignition Coil.

2. Install the new Ignition Coil into the plug hole of the cylinder head in the same orientation with the original sensor, in order to secure the connection to the spark plug terminal. Install the screw and connector. Turn the engine on and check if the ignition system works properly.

3. Pay extra attention when connecting the Ignition Coil to the spark plug. Misalignment can cause severe spark plug damage.

Fault finding

Possible failures 

Ignition coils can fail before their usual service life due to wear and defects such as overheating caused by internal short circuits, defective ignition cables, low battery power, vibration, thermal failures, mechanical damage and incorrect contacts.

  • No combustion: No combustion occurs because no spark is emitted.
  • Stalling: Engine stalls but can be restarted.
  • Poor drivability: Hesitation during acceleration or the engine misfires.
Prevention and Solutions 
The Diagnostic Trouble Code (DTC) engine warning light will probably be turned on, indicating an ignition error – however, this might be caused by another system problem. A visual check should therefore be performed first. Check for any mechanical damage, such as cracks and carbon tracks on the Ignition Coil body, any corroded or worn plugs and cables in the wiring, any loss in battery power to the ignition system, and any oil or water contamination.
If an ignition coil is identified as defective, the root cause should be determined with care, to avoid the replacement Ignition Coil failing just like the original Ignition Coil. The vehicle manufacturer’s ignition system instructions should always be referred to in the first instance.