Ignition Coil and Iridium Spark Plugs for Dodge Ram 1500 (2002-2008) 3.7L

Direct-Fit Ignition Coil and Iridium Spark Plug Kit for 2002-2008 Dodge Ram 1500

What it Does: Restores factory secondary ignition output and spark energy to eliminate cylinder misfires, rough idle, and unburned fuel wash in 3.7L V6 engines.

The Stock Ram 1500 Secondary Ignition Breakdown

The factory coil-on-plug units on the 3.7L PowerTech engine suffer from continuous thermal cycling and under-hood heat soak. Over mileage and heat cycles, internal epoxy insulation develops micro-fractures, allowing high-voltage current to arc to ground rather than discharging across the plug gap. Coupled with standard factory plug electrode wear, the widened gap increases electrical resistance on the coils, leading to weak spark kernel development, cold-start stumbling, and under-load misfires.

The Engineering Solution

This direct-replacement ignition pack upgrades the system using heavy-duty internal copper windings encapsulated in high-dielectric epoxy resin to prevent voltage punch-through under high combustion pressures. Paired with fine-wire iridium spark plugs engineered with high thermal capacity, this assembly lowers the ionization voltage required for ignition, ensures precise flame front propagation, and resists carbon fouling during extended idle and towing conditions.

Technical Specifications

Compatibility

• 2002-2008 Dodge Ram 1500 3.7L V6 (ST, SLT, Tradesman Trims)
• Direct OE Interchange: UF270, UF-270, UF297, UF399, 56028138, 56028138AB, 56028138AD, 56028138AE, 56028138AF, 52-2034, 5C1114, E232, 178-8483, ZFR6FGP

The Dodge Durability Standard

Engineered to handle severe thermal and vibrational stress during heavy bed loads and towing, this ignition rebuild maintains steady combustion timing and reliable power delivery across all operational demands.