Ignition Coil and Iridium Spark Plugs for Isuzu i-370 (2007-2008) 3.7L

Direct-Replacement Ignition Coil and Iridium Spark Plug Kit for 2007-2008 Isuzu i-370

What it Does: The ignition coil and iridium spark plug kit replaces fatigued factory coil packs and degraded plugs on the 2007-2008 Isuzu i-370 to eliminate misfires, restore combustion efficiency, and stabilize idle quality.

The Stock Isuzu i-370 Dielectric Breakdown Weakness

The factory ignition architecture on the GMT355 platform paired with the Atlas LLR 3.7L inline-five engine subjects coil-on-plug pencil modules to severe thermal cycling directly above the exhaust manifold side of the cylinder head. Over time, internal epoxy potting breaks down and secondary winding insulation deteriorates from chronic heat soak. This thermal degradation creates internal short circuits and high-voltage leak paths, causing partial spark delivery, sluggish throttle response, and cylinder-specific misfire codes (P0300–P0305). Furthermore, worn factory spark plug gaps increase the required breakdown voltage, accelerating coil stress and causing intermittent combustion failure under load.

The Engineering Solution

This comprehensive service kit pairs five high-output pencil coils with precision-engineered iridium spark plugs to restore factory secondary ignition performance. Each coil is wound with high-conductivity copper wire sealed in high-grade dielectric epoxy to eliminate arc-through and resist thermal fracturing. The accompanying spark plugs utilize an ultra-fine iridium center electrode and nickel ground design, requiring lower ionization voltage to jump the gap while offering extreme resistance to electrical erosion and carbon fouling. Fitted with heat-resistant silicone boots and corrosion-resistant internal stainless steel springs, this kit directly restores sharp throttle modulation and steady idle on your Atlas LLR engine without requiring ECU modification.

Technical Specifications

Compatibility

• 2007 Isuzu i-370 LS Extended Cab 3.7L L5
• 2007 Isuzu i-370 LS Crew Cab 3.7L L5
• 2008 Isuzu i-370 LS Extended Cab 3.7L L5
• 2008 Isuzu i-370 LS Crew Cab 3.7L L5

Frequently Asked Questions

Does this fit the GMT355 i-370?
Yes, this is a direct fit for the 2007-2008 Isuzu i-370 equipped with the Atlas LLR engine.

Do these iridium plugs require gapping prior to installation?
The spark plugs come pre-set to factory specifications, but verifying electrode gap before installation is recommended to guarantee proper arc clearance.

The Isuzu Durability Standard

Built for the demands of working trucks, this ignition kit provides steady spark delivery to preserve low-end torque, payload capacity, and reliable cold-weather starting under demanding utility conditions.