NA Miata Spark Plug Wires Replacement DIY

It is highly recommended to replace your spark plug wires and your spark plugs at the same time to complete your ignition system tune up. Removing your spark plug wires is required to replace the spark plugs anyway, and will only add a few additional minutes to the job. It’s also a great way to keep your NA Miata running smoothly and misfire-free!

This is a very easy job that any aspiring DIYer can complete. The most important thing to remember is the order of the wires. The 1.6 Miata spark plug wires order is different than the 1.8 order, and you’ll want to make sure that you don’t mix them up!

Estimated Mechanic Cost (Parts + Labor)	Parts Cost	DIY Savings
$225	$50	$175

Tools Required:

• none!

Parts Required:

• spark plug wires set

Instructions:

1. Pull each spark plug wire out of the cylinder head by wiggling it back and forth while pulling upward.
2. For cylinders 1-3, pull the plug wire out of the retaining clips on the valve cover.
3. Pull the plug wire off of the ignition coil at the back of the cylinder head.
4. Attach your new plug wires to the ignition coil. Important: the order of the plug wires is different depending on if you have a 1.6 (1990-1993 model years) or 1.8 (1994-1997 model years).

For 1.6 engines the order (from left to right) is 3-2-1-4. Note that “1” refers to cylinder 1, the cylinder closest to the radiator and front of the car.

For 1.8 engines, the order (from left to right) is 4-1-2-3 (the reverse of the 1.6 engines). Just as before, cylinder 1 refers to the front-most cylinder.

5. For cylinders 1-3, route the plug wire back into the retaining clips on the valve cover.
6. Push each plug wire firmly back into the cylinder.

You’ve just replaced your NA Miata spark plug wires, for more tips and tricks to keep you Miata running smoothly follow us on social media.