Coils, Modules & Pick-Ups

INFINITI Coils, Modules & Pick-Ups

Ever wonder how ignition coils break down or what they need to be replaced? These electrical components transform your battery's 12 volts into thousands of volts needed to fire spark plugs. The EX35 and JX35 use individual coil-on-plug assemblies for each cylinder, improving reliability and performance. When a coil fails, the affected cylinder stops firing, causing rough idle and reduced power.

Understanding Ignition Coil Operation

Each ignition coil contains primary and secondary wire windings around an iron core. When the engine computer energizes the primary winding, it creates a magnetic field. Interrupting current flow collapses this field rapidly, inducing high voltage in the secondary winding. This voltage travels directly to the spark plug mounted beneath the coil. Modern coils include electronic modules that regulate spark timing and duration based on computer commands.

Why Coils Fail Prematurely

Heat from the engine gradually breaks down insulation around internal windings, causing electrical shorts after 60,000 to 100,000 miles. Vibration loosens internal connections or cracks the coil housing. Oil leaks from worn valve cover gaskets contaminate coil boots and create tracking paths for voltage. Worn spark plugs require higher voltage that stresses coils beyond their design limits. Aftermarket coils often use thinner wire and less robust insulation that fails faster under engine bay temperatures, particularly in turbocharged applications.

When Coil Replacement Becomes Necessary

A misfiring cylinder triggers check engine lights and stores diagnostic codes identifying the faulty coil. Engine stumbling during acceleration indicates one or more coils aren't firing consistently. Reduced fuel economy results from incomplete combustion in affected cylinders. Genuine INFINITI Canada ignition coils deliver consistent spark energy across all operating conditions, while generic coils may have inadequate output at high RPM or different resistance values that affect engine timing.

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