UF270 Ignition Coil & 4503 Double Iridium Spark Plug Set - Reliable

In this review the UF270 ignition coil and 4503 double iridium spark plug kit is evaluated for owners of late 1990s to 2008 V8 trucks and SUVs looking for an OEM-style replacement. The bottom line: this kit is for drivers who need a full set of eight coil packs and eight long-life spark plugs to address misfires, rough idle or declining fuel economy, and who want a straightforward swap that restores engine smoothness without complicated modifications. It delivers sensible performance and a clear improvement in drivability for compatible 4.7L and 3.7L engines.

Key Features

• Complete kit: Includes eight ignition coil packs and eight double iridium spark plugs so a full-bank replacement can be done in one service session for consistent performance across all cylinders.
• Wide vehicle coverage: Compatible with many Dodge, Jeep, Chrysler and Mitsubishi models with the 4.7L V8 and certain 3.7L 2007-2008 engines, making it a practical choice for common truck and SUV platforms.
• Durable spark plugs: Double iridium construction is designed for a long service life and a stable, consistent spark that supports better cold starts and reliable combustion.
• OE-style coil construction: Coils feature a stainless-steel spring, ferrite noise suppressor and thermoplastic connector to resist heat cycling and maintain a solid electrical connection.
• Restores drivability: Replacing worn coils and plugs reduces misfires, smooths idle and can improve fuel economy when original components have deteriorated.

Who It's For

This kit is best for owners of 2000-2007 Dodge Dakota and Durango, 2002-2007 Dodge Ram 1500 with 4.7L engines, 1999-2007 Jeep Grand Cherokee 4.7L, 2006-2007 Jeep Commander, 2007 Chrysler Aspen and 2006-2007 Mitsubishi Raider who need a direct replacement for worn ignition coils and plugs. Mechanics and DIYers who prefer to replace the entire bank at once will appreciate receiving all eight coils and plugs in a single package.

It is not the ideal choice for vehicles outside the listed compatibility or for those seeking performance tuning beyond OE specifications. Buyers who prioritize absolute top-tier longevity should be aware that some users reported mixed durability, so frequent heavy-duty use may warrant higher-end aftermarket options.

Pros & Cons

Pros

• Good OEM fit and function that often fixes misfire and rough-idle complaints.
• Double iridium plugs provide long life and consistent spark for improved cold starts.
• Complete set of eight coils and plugs offers convenience and uniform replacement value.

Cons

• Some users reported mixed durability over long-term use, so lifespan may vary by driving conditions.

Specifications

Brand	X4XZ
Kit contents	8 ignition coil packs and 8 double iridium spark plugs
Primary fitment	4.7L V8 engines (selected Dodge, Jeep, Chrysler, Mitsubishi models)
Additional fitment	Some 3.7L Dodge Dakota and Ram 1500 models (2007-2008)
OE references	UF270, 4503; replaces SKIC038, 5C1114, UF297 and related numbers
Plug type	Double iridium
Warranty	1 year product service and 24-hour customer support

Our Verdict

The UF270 and 4503 combined kit is a sensible, cost-effective full-bank replacement for compatible 4.7L and some 3.7L engines, delivering noticeably improved idle, reduced misfire and potentially better fuel economy compared with worn originals. It is good value for owners who want an OEM-style swap and straightforward installation, though those seeking the absolute longest-lived components under heavy duty use should consider premium alternatives.

Frequently Asked Questions

Does this kit include all parts needed for a full replacement?
Yes, the package includes eight ignition coil packs and eight double iridium spark plugs for a complete bank replacement; no instruction manual is included.

Will these fit my Ram 1500 with a 4.7L V8?
They are compatible with many 2002-2007 Dodge Ram 1500 trucks with the 4.7L V8; confirm vehicle year and engine before purchase using the fitment list.

What common problems does replacing these parts fix?
Swapping coils and plugs typically resolves engine misfire, rough idle, loss of power and poor fuel economy caused by worn ignition components.