Ford Spark Plug Buyer's Guide

A spark plug is one of the parts you can diagnose and replace yourself without the need to bring your Ford into a shop. That’s why it’s a good idea to know quite a bit about the spark plugs in your engine.

This guide has all the information you need. Read on to find out what spark plugs, how to diagnose a bad spark plug, and more.

What is a Spark Plug?

Motorcraft plugs

For such a small part, the spark plug plays a large role in the smooth operation of your engine. The spark plug is a small tube-shaped electrical part inside the cylinder. It creates an artificial lightning bolt inside the cylinder that ignites the air/fuel mixture. The number of spark plugs your engine has depends on how many cylinders there are. For a more thorough explanation of spark plugs, check out this article.

How to Diagnose a Failing Spark Plug

Like all car parts, spark plugs fail after some time. A spark plug typically lasts about 50K miles. Once you start noticing some symptoms of a bad spark plug, you can go into your engine and physically inspect your spark plugs to see if any of them has gone bad.

You can find a complete set of instructions here.

OEM Ford Spark Plugs Vs. Aftermarket Spark Plugs

If you're looking for replacement spark plugs, you might be wondering if aftermarket spark plugs are a good investment. They're actually not. It's because aftermarket spark plugs usually fail early. As a result, they cost more than OEM spark plugs in the long run.

This comparison guide goes into more detail about why OEM spark plugs are a much smarter investment than aftermarket spark plugs.

How to Replace a Spark Plug

If you're up for the task of replacing your spark plugs, grab some basic tools, and roll up your sleeves. Basically, you just need to move some parts out of the way, remove the ignition coil, and then remove the spark plug.

For a complete set of instructions on replacing a spark plug, check out this tutorial.