Ignition Coil and Iridium Spark Plugs for Chevrolet Colorado (2004-2006) 2.8L

Direct-Fit Ignition Coil and Iridium Spark Plug Kit for 2004-2006 Chevrolet Colorado

What it Does: The ignition coil and iridium spark plug kit restores factory spark energy and stabilizes combustion across the cylinder bank on the 2004-2006 Chevrolet Colorado 2.8L to eliminate misfires and rough idling.

The Stock Chevrolet Colorado Atlas Ignition Breakdown

The factory coil-on-plug modules on the GMT355 platform endure severe thermal cycling directly above the exhaust manifold side of the cylinder head. Over time, engine bay heat degrades the internal copper primary and secondary windings, causing dielectric breakdown within the epoxy insulation. Concurrently, factory copper or platinum plugs experience electrode erosion, widening the spark gap past standard tolerances. This elevated electrical resistance overworks aging coil packs, inducing micro-arcing through dried silicone boots and triggering P0300 through P0304 DTC misfire codes under load.

The Engineering Solution

This direct-replacement ignition service pack utilizes high-grade magnetic steel cores and copper wire winding with elevated temperature insulation ratings to resist electrical leakage under high thermal stress. Mated with fine-wire iridium-tipped spark plugs, the assembly concentrates spark discharge voltage across a stable 0.040-inch electrode gap. The ultra-dense iridium center electrode resists spark erosion, operating efficiently in high-heat cylinder chambers without fouling, while high-tear-strength fluorosilicone boots isolate voltage spikes directly to the plug terminal, preventing spark blowout under heavy engine load.

Technical Specifications

Compatibility

• 2004 Chevrolet Colorado Base, LS, Z85, Z71 (2.8L L4 LK5)
• 2005 Chevrolet Colorado Base, Sport, Sport LS, Z85, Z71 (2.8L L4 LK5)
• 2006 Chevrolet Colorado Base, LS, LT, WT, Z85, Z71 (2.8L L4 LK5)

Frequently Asked Questions

Does this fit the GMT355 Colorado?
Yes, this is a direct fit for the 2004-2006 Chevrolet Colorado equipped with the LK5 2.8L inline-four engine.

Are the spark plugs pre-gapped for installation?
Yes, the iridium plugs are preset to factory gap specifications, though inspecting tolerances prior to torquing is recommended practice.

The Chevrolet Workhorse Standard

Built to handle sustained payload hauling and daily fleet abuse, this ignition kit maintains consistent flame kernel development to preserve low-end torque delivery and fuel efficiency across tough duty cycles.