Ignition Coil and Iridium Spark Plugs for GMC Canyon (2004-2006) 3.5L

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

What it Does: The Ignition Coil and Iridium Spark Plug Kit restores factory combustion efficiency and resolves secondary ignition breakdown on the 2004-2006 GMC Canyon 3.5L.

The Stock GMC Canyon Ignition Breakdown

The 3.5L Atlas engine in the GMT355 chassis relies on deep-well coil-on-plug packs that endure intense thermal cycling. Over time, OEM potting epoxy degrades, developing micro-fractures that lead to internal arc-over, secondary insulation breakdown, and chronic P0300 to P0305 cylinder misfire codes. Paired with aged, eroded factory spark plug gaps, the increased electrical resistance strains the ignition drivers, causing rough idle, unburnt fuel wash, and loss of towing power.

The Engineering Solution

Engineered to exceed OEM baseline specs, this direct-fit ignition kit utilizes high-dielectric epoxy encapsulation and heat-resistant silicone boots to completely eliminate flashover. The pencil coils feature high-conductivity copper primary and secondary windings wound to resist internal breakdown under sustained high-load conditions. The included fine-wire iridium spark plugs feature a laser-welded electrode offering a melting point over 2,400°C. This guarantees consistent flame kernel development, stable spark propagation, and sustained cold-start reliability across the entire RPM band.

Technical Specifications

Compatibility

• 2004 GMC Canyon (Base, SLE, Z71, Z71 Fleet, Z85, Z85 Crew Cab) 3.5L L5
• 2005 GMC Canyon (Base, SLE, Z71, Z71 Fleet, Z85, Z85 Crew Cab) 3.5L L5
• 2006 GMC Canyon (SL, SLE, WT, Z71, Z71 Fleet, Z85, Z85 Crew Cab) 3.5L L5

Frequently Asked Questions

Does this fit the GMT355 Canyon?
Yes, this is a direct fit for the 2004-2006 GMC Canyon equipped with the L52 3.5L inline-5 engine.

Do these iridium spark plugs require pre-gapping before installation?
The iridium plugs arrive pre-gapped to factory tolerance; avoid running a mechanical feeler tool against the fine-wire center electrode to prevent damaging the iridium tip.

The GMC Workhorse Caliber

Light-duty pickups demand resilient ignition performance when hauling payload or running heavy utility cycles. This 5-coil, 5-plug service kit restores low-end torque delivery and fuel efficiency under towing loads, maintaining factory engine reliability without ignition dropouts.