Ignition Coil and Iridium Spark Plugs for Cadillac ELR (2014-2015) 1.4L

Direct-Fit Ignition Coil Pack and Iridium Spark Plug Kit for 2014-2015 Cadillac ELR

What it Does: The ignition coil rail and iridium spark plug kit restores secondary ignition voltage and combustion efficiency on the 2014-2015 Cadillac ELR to eliminate high-load misfires and erratic range-extender operation.

The Stock Cadillac ELR Ignition Pack Thermal Breakdown

The 1.4L LUU range-extender on the Delta II platform packages its ignition components under a tightly sealed engine cover within an enclosed compartment. Over time, sustained heat cycling degrades the internal secondary windings and dielectric potting compound of the factory single-piece ignition rail. This thermal breakdown causes microscopic insulation fractures, high-voltage flashover, and boot carbon tracking. Paired with degraded factory spark plugs featuring eroded nickel or worn precious metal gap tolerances, the weakened spark induces intermittent P0300 through P0304 DTCs, sluggish generator engagement, and uneven generator load transitions during hybrid drive cycling.

The Engineering Solution

This complete secondary ignition service kit includes an upgraded multi-spark coil pack rail paired with four pre-gapped, high-temp iridium spark plugs. The coil rail features high-grade epoxy potting and premium copper primary/secondary windings to prevent thermal arc-through under heavy continuous alternator loads. Reinforced silicone dielectric boots resist dry rotting and dielectric puncture. The accompanying iridium spark plugs utilize ultra-fine wire center electrodes and laser-welded ground pads to lower ignition demand voltage, resist fouling, and ensure instantaneous flame kernel propagation under lean air-fuel ratios. Replaces OEM cross-references 55577898, UF669, and 55579072.

Technical Specifications

Compatibility

• 2014 Cadillac ELR Base Coupe 2-Door 1.4L L4 Electric/Gas
• 2015 Cadillac ELR Base Coupe 2-Door 1.4L L4 Electric/Gas

Frequently Asked Questions

Does this fit the Delta II ELR?
Yes, this is a direct fit for the 2014-2015 Cadillac ELR equipped with the 1.4L LUU engine.

Are the included iridium plugs pre-gapped for the 1.4L generator?
Yes, the spark plugs are preset to factory gap specification, though verifying clearance before installation is always standard practice.

The Cadillac Precision Standard

Luxury extended-range hybrid drivetrains require strict secondary ignition stability. This direct-replacement ignition assembly ensures OEM communication protocol integrity, smooth generator transitions, and an immediate return to CEL-free reliability.