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Ignition System
The 6.8L engine is equipped with a coil-on-plug ignition system. Rather than a
remotely mounted coil with secondary ignition wires, this system has a separate
ignition coil mounted on each spark plug. Operation of the coils is controlled by the
engine computer module (GCP), which computes ignition timing based on inputs from
engine sensors.
Renew Spark Plugs
WARNING: THE IGNITION SYSTEM COMMONLY CARRIES VOLTAGES IN EXCESS OF
30,000 VOLTS. PLEASE USE CAUTION.
CAUTION: Do not pull directly on the lead as this could cause the wire connection
inside the boot to become separated.
NOTE: To remove spark plugs you must first remove coils.
1. Disconnect the ignition coil wire connectors.
2. Remove the hold down screw then the coil.
NOTE: For fuel rail clearance rotate coils 45° clockwise and lift out.
3. After loosening each spark plug one or two turns with a proper spark plug spanner, clean the
area around each spark plug port with compressed air then remove the spark plugs.
WARNING: PROTECTIVE GOGGLES MUST BE WORN TO PROTECT THE
EYES WHEN USING COMPRESSED AIR.
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