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In this guide, you will find step-by-step instructions on how to change the spark plugs on a Mazda with a four-cylinder engine. These instructions apply to the inline 4 engine found on Mazda 2, 3, 5, 6, 323, Protege, etc.
Replacing spark plugs on a Mazda engine requires a few basic tools and two hours of labor.
Replacing the spark plugs on a Mazda requires a few basic tools and parts.
Tools Required
Parts Required
The following instructions show you how to change spark plugs on a Mazda four-cylinder engine.
This is one of the most common Mazda engines found on Mazda 3, Mazda 5, Mazda 6, CX-5, CX-7.
Park vehicle. Park your Mazda on level ground. Allow the engine to cool down.
Remove Spark Plugs. Use the spark plug socket, extension, and ratchet to remove the spark plugs from your Mazda.
Install new spark plugs. Install new spark plugs on your Mazda.
Reinstall Ignition Coils.
Reinstall Engine Cover
The recommended interval spark plug replacement for most Mazda vehicles with a 4-cylinder engine is every 75,000 miles. This value can vary depending on the spark plug type installed in the engine. Check the owner's manual to verify.
Copper spark plugs on older Mazda vehicles need to be replaced every 30,000 miles.
Tighten the spark plug to:
Mazda factory spark plug gap is typically in the .045 to .057 range.
Iridium spark plugs such as Denso Iridiums for Mazda come pre-gapped at 0.044 and should not be changed.
NGK Spark Plugs for Mazda come pre-gapped at 0.054. Do not gap iridium spark plugs.
By YOUCANIC Automotive Experts Published on: Wednesday, September 6, 2017. |