Ignition Coil and Iridium Spark Plugs for GMC Canyon (2004-2006) 2.8L

Direct-Fit Ignition Coil and Iridium Spark Plug Kit for 2004-2006 GMC Canyon

What it Does: The ignition coil and iridium spark plug kit restores secondary ignition voltage and resolves combustion misfires on the 2004-2006 GMC Canyon 2.8L to optimize idle stability, engine response, and under-load fuel efficiency.

The Stock GMC Canyon Secondary Ignition Breakdown

The factory coil-on-plug setup on the GMT355 chassis frequently suffers from dielectric breakdown due to intense thermal cycling within the narrow cylinder head spark plug wells of the Vortec 2800 (LK5) engine. Over time, the factory epoxy resin degrades and forms micro-fractures, allowing high-voltage flashover to the cylinder head rather than the electrode. Simultaneously, standard copper or worn platinum plugs exhibit rapid electrode erosion, expanding the gap beyond factory specification. This increased gap forces the aging coil pack to work harder to bridge the threshold, eventually burning out primary windings, triggering P0300-series misfire trouble codes, and causing hesitation during acceleration.

The Engineering Solution

This refresh kit replaces worn electronics with four upgraded coil-on-plug units and four laser-welded iridium spark plugs. The replacement coils utilize high-grade magnetic steel cores paired with thermal-resistant epoxy potting to resist under-hood heat soak and combat internal shorting. Premium high-dielectric silicone boots prevent voltage leakage and resist carbon tracking along the ceramic insulator. Matched with fine-wire iridium center electrodes, this combination requires significantly lower firing voltage while yielding faster flame kernel propagation, ensuring consistent combustion under tow loads or wide-open throttle conditions.

Technical Specifications

Compatibility

• 2004 GMC Canyon (Base, SLE, Z85, Z71) - 2.8L L4 Gas
• 2005 GMC Canyon (Base, SLE, Z85, Z71) - 2.8L L4 Gas
• 2006 GMC Canyon (Base, SL, SLE, WT, Z85, Z71) - 2.8L L4 Gas

Frequently Asked Questions

Does this fit the GMT355 Canyon?
Yes, this is a direct fit for the 2004-2006 GMC Canyon equipped with the 2.8L LK5 engine.

Are the included iridium spark plugs pre-gapped?
Yes, the plugs arrive pre-gapped to factory specification, but verifying gap clearance prior to installation is always standard practice.

The GMC Workhorse Standard

Built to handle genuine utility demands, this ignition package delivers the durable, uncompromised spark energy required to keep your truck running clean under heavy bed payloads and sustained highway towing.