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Dodge Durango
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Ignition System » Description and operation
Ignition coil-4.7L engine

DESCRIPTION

The 4.7L V-8 engine uses 8 dedicated, and individually fired coil (Fig. 2) for each spark plug. Each coil is mounted directly to the top of each spark plug (Fig. 3).

Fig. 2 Ignition Coil-4.7L Engine Fig. 2 Ignition Coil-4.7L Engine

1 - O-RING

2 - IGNITION COIL

3 - ELECTRICAL CONNECTOR

OPERATION

Battery voltage is supplied to the 8 ignition coils from the ASD relay. The Powertrain Control Module (PCM) opens and closes each ignition coil ground circuit at a determined time for ignition coil operation.

Base ignition timing is not adjustable. By controlling the coil ground circuit, the PCM is able to set the base timing and adjust the ignition timing advance. This is done to meet changing engine operating conditions.

The ignition coil is not oil filled. The windings are embedded in an epoxy compound. This provides heat and vibration resistance that allows the ignition coil to be mounted on the engine.

Because of coil design, spark plug cables (secondary cables) are not used.

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