Ignition Coil and Iridium Spark Plugs for Chevrolet Colorado (2007-2012) 2.9L

OEM-Grade Ignition Coil and Iridium Spark Plug Kit for 2007-2012 Chevrolet Colorado

What it Does: The Ignition Coil and Iridium Spark Plug Kit replaces degraded factory ignition components on the 2007-2012 Colorado to eliminate cylinder misfires, restore factory combustion efficiency, and stabilize rough idle.

The Stock Chevrolet Colorado Thermal Breakdown Problem

Factory coil-on-plug units on the GMT355 chassis operate in a demanding thermal environment alongside the cylinder head of the Vortec 2900 (LLV) inline-four. Over tens of thousands of thermal cycles, engine bay heat soak degrades the internal epoxy potting and copper primary windings, inducing internal dielectric breakdown, secondary resistance drift, and intermittent misfires under load (P0300–P0304). Simultaneously, factory plugs suffer electrode erosion and widening gaps, forcing fatigued coils to produce unsustainably high ionization voltages that trigger ignition blowout.

The Engineering Solution

This direct-fit ignition kit restores spark energy using high-dielectric epoxy housings and high-conductivity copper secondary windings engineered to suppress internal arcing and thermal breakdown. Paired with fine-wire iridium spark plugs featuring laser-welded center electrodes, this package significantly lowers required firing voltage while maintaining superior thermal conductivity and flame kernel propagation. Designed as a direct swap for OEM numbers 12596547, UF497, and 12612369, this matched set ensures precise dwell-time compliance and immediate throttle response without PCM reprogramming.

Technical Specifications

Compatibility

• 2007-2012 Chevrolet Colorado Base (2.9L L4 LLV)
• 2007-2012 Chevrolet Colorado LS (2.9L L4 LLV)
• 2007-2012 Chevrolet Colorado LT (2.9L L4 LLV)
• 2007-2012 Chevrolet Colorado WT (2.9L L4 LLV)

Frequently Asked Questions

Does this fit the GMT355 Colorado?
Yes, this is a direct fit for the 2007-2012 Chevrolet Colorado equipped with the LLV 2.9L inline-four engine.

Are these iridium plugs pre-gapped for the 2.9L engine?
Yes, the spark plugs are calibrated to factory gap specifications for out-of-the-box installation without manual adjustment.

The Chevrolet Durability Standard

Engineered to handle the continuous payload and towing demands of the Colorado platform, this ignition service package resists high-vibration stress and sustained thermal loads across tough work cycles.