autoexact Ignition Coil and Iridium Spark Plug Kit — 8 Coil Packs + 16 Plugs for 5.7L HEMI, Pre-gapped & Epoxy-Potted

Autoexact 8-coil and 16-iridium-plug kit is a complete ignition replacement set designed to restore reliable spark for 5.7L HEMI V8 engines in compatible Ram, Dodge, Jeep and Chrysler models.

This full-service ignition kit combines eight direct-replacement coil packs and sixteen pre-gapped iridium spark plugs engineered to match factory fit and firing specifications for many 5.7 V8 HEMI vehicles from 2008 through 2024. The set aims to simplify maintenance by supplying matched coils and plugs in one purchase, along with pre-lubricated components and clear torque guidance so you can complete a coordinated ignition service with fewer parts-sourcing headaches.

How do these coils and plugs fit my 5.7 HEMI?

The kit is built to match OE mounting points, electrical connectors, and plug type used on many 5.7L HEMI engines. Fitment varies by model year and vehicle; always verify year, make, model, engine code, and OE part numbers before ordering to confirm compatibility.

• Designed as direct replacements for UF504, C1526, 56029129AA/AB coil references.
• Spark plugs replace 92145, ILZFR5B-style fine-wire iridium plugs.
• Intended for Ram 1500/2500, Dodge Charger/Challenger, Durango, Jeep Grand Cherokee and selected Chrysler models listed in fitment guidance.

What improvements should I expect after installing this kit?

Replacing worn coils and plugs together can restore consistent spark delivery and reduce ignition-related drivability issues when those components are the root cause. While results depend on overall engine condition, new iridium plugs and epoxy-potted coils aim to improve starting, idle smoothness, and throttle response compared with heavily used parts.

• Fine-wire iridium tips for stable spark and longer service life.
• Epoxy-potted coil bodies for vibration and heat resistance.
• Factory pre-lubricated boots with green dielectric grease for easier installation.

How should I install and torque the spark plugs and coils?

Installation follows standard ignition service steps: remove old coils and plugs, inspect boots and connectors, install plugs hand-tight then torque to specification, and re-seat coil packs. The kit includes pre-gapped plugs and recommends tightening to the manufacturer torque range for safe sealing and electrical contact.

• Recommended spark plug torque: 25–30 N·m (18.44–22.13 ft·lb).
• Use dielectric grease on boot surfaces as provided to ease seating and resist moisture.
• Confirm connector clips are fully engaged and wiring harnesses are undamaged.

What diagnostics or symptoms point to needing a full kit?

Common ignition-related symptoms include misfire codes, rough idle, hesitation, and difficulty starting; when multiple cylinders show issues or components are aged, a complete coil-and-plug replacement is often the most efficient remedy. Always diagnose with a scan tool and visual inspection to rule out unrelated causes such as fuel, compression, or wiring faults.

• Possible related trouble codes: P0300–P0308 for misfires.
• Visible wear: corroded plugs, cracked boots, or oil-contaminated components.
• Multiple cylinders affected usually indicates replacing coils and plugs together.

Who is this for: This Autoexact kit is aimed at DIY enthusiasts, independent mechanics, and fleet technicians who service 5.7L HEMI-equipped Ram, Dodge, Jeep, and Chrysler vehicles and want a single, matched set of ignition coils and iridium plugs to complete a coordinated maintenance job. It suits anyone preferring a full-system refresh instead of piecemeal part replacement, provided they confirm vehicle fitment and follow torque and installation best practices. The product includes a 2-year warranty and lifetime technical support for installation questions.