Autoexact FD504 Ignition Coil and Iridium Spark Plug Kit, 8 Coils and 8 Plugs

Getting the most from it

This 8-coil, 8-plug kit pairs ignition coils with pre-gapped iridium spark plugs for a set replacement on select Ford, Mercury, and Lincoln vehicles. The listed applications include specific F-150, E-350, Expedition, F-250, E-250, E-150, Grand Marquis, and Town Car configurations, with engine and year ranges that vary by model. Check your vehicle’s year, make, model, engine, and OE number before ordering, the same model name can have different engine configurations.

Replacing both types of ignition components together gives you a coordinated set rather than sourcing coils and plugs separately. The kit is intended for vehicles whose existing ignition components are worn or due for replacement—not as a fix for every rough-running or hard-starting problem.

What you’ll notice day to day

The iridium plugs are supplied pre-gapped, and the coils are described as direct replacements for listed applications. That can make the kit relevant when addressing ignition-related symptoms such as misfires, rough idle, hesitation, or hard starting, provided worn coils or plugs are the cause. Those symptoms can also have other causes, so persistent issues may need diagnosis rather than a parts swap alone.

Buyer feedback is positive about fit, coil operation, and perceived engine performance after installation. Those reports offer useful context, but they don’t establish that this kit will resolve a particular vehicle’s symptoms or confirm compatibility with your exact configuration.

Installation is described as a bolt-on replacement, but basic tools may be required. The listing recommends professional installation for anyone unfamiliar with ignition-system service. It also gives a spark-plug torque recommendation of 15 (11.06 ft·lb), follow your vehicle’s service information if it specifies otherwise.

What matters most

The main buying decision is fitment. The listed applications include, among others, F-150 versions with 4.6L or 5.4L engines, E-350 Super Duty 5.4L models, and several other Ford, Mercury, and Lincoln vehicles. The applicable years differ by engine and model, so don’t rely on a vehicle name alone. Match the OE number and engine details against the kit before purchase.

A set makes sense when several aging ignition parts are being replaced together. If only one coil has failed, the manufacturer says a single-coil replacement is possible, replacing the full set is a broader approach, not an automatic requirement. The kit includes 8 coils and 8 plugs, so it is best considered in the context of the vehicle’s needs and confirmed application.

The plugs are identified as fine-wire iridium and the coils as epoxy-potted. The manufacturer lists a 2-year warranty and lifetime technical support. These details may matter when comparing a combined replacement kit with buying individual ignition parts, but they don’t remove the need to verify the exact fit.

What to clarify

How do I confirm compatibility? Check the year, make, model, engine, and OE number. Fitment can vary within a model year, and the listed applications are not a blanket match for every vehicle named.

Do the spark plugs need gapping? They are supplied pre-gapped. The listing says not to adjust the gap unless your vehicle’s manual requires it.

Is installation suitable for a DIY repair? The kit is designed as a direct replacement, but basic tools may be needed. Professional installation is recommended if you are not familiar with ignition-system service.

Should you buy it?

A solid pick if your vehicle matches a listed engine and OE application and you want coils and plugs together for a planned ignition refresh. It may not suit you if you haven’t confirmed the exact engine and part-number match, or if you’re expecting new ignition parts to solve symptoms that haven’t been diagnosed. For a single known failed coil, compare the full kit with replacing that individual part, the broader set is more relevant when replacing multiple components at once.