Iridium spark plugs such as Denso Iridiums for Mazda come pre-gapped at 0.044 and should not be changed. Mazda factory spark plug gap is typically in the. Check the owner’s manual to verify.Ĭopper spark plugs on older Mazda vehicles must be replaced every 30,000 miles. The recommended interval spark plug replacement for most Mazda vehicles with a four-cylinder engine is every 75,000 miles. This value can vary depending on the spark plug type installed in the engine. Replacing the spark plugs on a Mazda is a straightforward procedure that can save you hundreds of dollars. If the check engine light comes on, follow this guide on troubleshooting the Mazda check engine light. Start the vehicle and ensure it is running correctly.Reinstall coils and connect the electrical connectors.Tighten the ignition coil bolt’s hand tight. Tighten the spark plug finger-tight until it reaches the cylinder head.Use a magnetic pickup tool to pull out the spark plugs.Use the spark plug socket, extension, and ratchet to remove the spark plugs from your Mazda. Remove the 10mm bolts that secure the coil in place.Unplug the electrical connector from the ignition coil.In this Mazda, there are no screws to secure the cover. If no bolts are present, grab the engine cover with both hands and lift it. Check for bolts on top of the engine cover. The negative terminal is difficult to reach due to the small space between the battery and the firewall. Disconnect the negative battery terminal.Pull the hood release and open the hood.This is one of the most common Mazda engines on Mazda 3, Mazda 5, Mazda 6, CX-5, and CX-7. The following instructions show you how to change spark plugs on a Mazda four-cylinder engine. If you prefer OEM spark plugs, buy them online to save money. OEM Mazda sparks plug at the dealer cost over $20 per spark plug. They come pre-gapped for Mazda and also have excellent reviews from Mazda owners. If you are looking for the best aftermarket spark plugs for Mazda, a good choice is NGK Spark Plugs for Mazda. Replacing the spark plugs on a Mazda requires a few essential tools and parts.
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