How to Change Spark Plugs Ford F150 4.6L Engine

Looking for the right spark plugs for your Ford F150 4.6L engine could be a challenge for individuals who aren’t mechanically inclined. This article will guide you through the process of changing them, allowing you to get back on the road as soon as possible.

It is one of the most popular crucial components of an engine to have a properly functioning spark plug. They aid in the operation of the engine by igniting the fuel/air combination. As a rule of thumb, the total number of spark plugs in a machine can be counted in the same way as the total number of cylinders in the engine.

When the spark plugs fail, the engine begins to operate at dangerously low RPMs, even if just one of the plugs fails. The spark plug change interval is shown in the service card of the vehicle manufacturer; it’s a different story if the engine is sluggish. A new set of spark plugs is necessary to keep the engine running smoothly.

The ability to carry tremendous loads is the primary function of spark plugs. The more expensive and high-quality the item, the longer it will last when it comes to consumables.

A malfunctioning engine system should necessitate immediate replacement of all components, regardless of their age. An issue often causes the Check Engine light with the plugs. When you change your Ford F-150’s spark plugs on schedule, you’ll notice a considerable improvement in fuel economy and save both money and stress.

Unless you’ve done this before, we don’t recommend putting your engine in jeopardy unless you’re an expert. Assuming you know how to remove the spark plugs securely, replacing them on your own is not a brilliant idea. To do their work swiftly and efficiently, mechanics in shops that have achieved certification employ equipment unique to the field.

How to Change Spark Plugs Ford F150 4.6L Engine

Step 1: Location

First and foremost, determine the location of the Spark Plugs. Each Cylinder in your engine has two spark plugs, so you’ll have a total of four. You can track them down on top of the engine block by checking for the cables connecting to each.

To begin, you’ll need to gain access to the ignition system and remove the spark plugs. You can get to them by drilling a hole in the Cylinder located beneath the ignition coils. The spark plugs can’t be seen clearly in most cylinders.

Where your plugs are this way, you’ll be taking a leap of faith. Even if it’s frightening, you may rest assured that everything will be fine as long as you stick to the instructions.

Step 2: How to Remove Spark Plugs That Are No Longer Working

Remove the old spark plugs before installing the new ones. Remove one spark plug at a time; Spark should be checked, cleaned, and gapped if they can be salvaged to keep this job from taking up your entire weekend. You can then proceed to the next spark plug in the replacement of the cylinder sequence. Gently twist the plug out of its socket with a wrench.

The engine’s performance could suffer if you lose any loose parts! Employ compressed air or an oil rag if pliers are too tricky to use due to the engine design limits. Spark plug wires can be removed by twisting and pulling them straight out from the boot (where it attaches to the spark plug).

Wire yanking should never be done on its own (You may be putting yourself at risk). Afterward, disconnect the spark plug’s wiring, you’ll see a shiny item protruding from the engine block.

Clean the region location of cylinder block-to-plug connection using a soft rag or a paintbrush.

An empty soda straw works well for this. Cleaning the region prevents debris from falling. The Cylinder enters the tube when the stopper is removed.

Step 3: Replace the old spark plug with the new one.

Install the new spark plug by inserting it into the socket. It’s ideal if you begin by hand. The cylinder head’s delicate threads won’t be stripped this way. If necessary, a wrench is required to tighten the plugs by gently twisting them into position. Because of the layout of the engine limits, keep an eye out for any missing pieces.

In cases where pliers aren’t an option because of the engine’s construction, it’s best to do this with compressed air or an oily cloth. There should be no need to use a ratchet to thread the plugs all the way through. Having completed this step, the ratchet can be used to complete the installation process. Be cautious not to over-tighten your screws because this can cause complications.

Step 4: Clean Up

Finish by applying some dielectric grease to the ignition coil’s tip as you work your way through it. After that, reinstall the spark plug’s coil, ensuring that it is securely attached to the plug.

Place the retainer bolt next, ignition coil with fuel injector connectors, and tighten the bolt down. All of the surfaces in the engine region should be cleaned using an oil rig.  When cleaning a spark plug, a wire brush or plug cleaner is developed for this ignition component. To remove stubborn deposits, Use a sturdy knife.

Step 5: When Should Spark Plugs Be Checked and Replaced?

Spark plugs should be checked and replaced as part of routine engine maintenance. Spark plugs come in two varieties: standard and long-life. Traditionally, Standard spark plugs need to be changed every 30,000-50,000 miles. Long-life spark plugs (tipped with iridium or platinum) require replacement after 60,000 to 150,000 miles depending on the vehicle.

The Maintenance Schedule, which may be found in your warranty and maintenance brochure, lists the suggested replacement intervals. A faulty spark plug may also demand an immediate replacement.

If your lawnmower or other outdoor power equipment won’t start, it should also be checked and replaced at least once a year or after 25 hours of use. But checking all this, it would be straightforward to know precisely when to replace your spark Plugs.


Hi, I'm the initiator and writer of this blog. Cars were and will be my first love, and my favorite hobby, that's why I decided to start this blog and write about my discoveries and techniques to improve my cars or repair them.