What is a spark plug?Spark plugs are a crucial part of the vehicle’s ignition system. They provide the spark that ignites the air-fuel mixture inside the engine, creating the chain-reaction that generates the engine’s power. Show
 How does the spark plug work?The spark plug turns high voltage electricity from the ignition coil into a strong spark inside the engine. This ignites the air-fuel mixture, creating power. What are the symptoms related to a bad spark plug?When spark plugs fail, the engine will struggle. The check engine light will come on, and it may appear either solid or flashing. The driver would likely notice one or more of the following: engine vibrations, rough idling, poor gas mileage, excessive cranking time needed to start the engine, and power loss or surging. In extreme circumstances, the engine may stall or fail to start. Can I drive with a spark plug problem?The car will run with a spark plug problem, but it's not wise to keep driving it this way. If a spark plug isn't working, unburned fuel from the engine will get into the exhaust at a higher rate, causing problems for the catalytic converter. If the converter gets ruined by this unburned fuel, it will lead to a costly repair. How often do spark plugs need to be replaced?Spark plugs do eventually wear out, and failure is most common after 100,000 miles of use under normal driving conditions. But that can be greatly shortened by harsh conditions or leaking fluids. Mazda CX-9 Spark Plugs Replacement Guide
Owners of other Mazda vehicles such as the CX-5, CX-3, CX-30, MX-30, CX-8, Mazda8 (MPV), MX-5 Miata, Mazda2 (Demio), Mazda3 (Axela), Mazda6 (Atenza) and Mazda5 (Premacy) may also find these DIY instructions to be helpful. The OEM (original equipment manufacturer) spark plug part number is Mazda PY8V-18-110 (also known as # PY8V18110 or PY8V 18110). The NGK part number is NGK DILKAR7M8 (also known as # NGK 90288). The tools and other items needed to complete this procedure include an 8mm socket, a 10mm socket, a 1/4" drive ratchet, a 14mm spark plug socket (or a 9/16" spark plug socket), a 3/8" drive ratchet, an extension bar, a tube of dielectric grease and possibly also a plastic pry bar tool or a flat head screwdriver. The first two steps are to open the hood and gently pull off the plastic engine cover. Set the plastic engine cover aside in a safe place. Skyactiv-G Turbocharged Four Ignition Coils Metal Bracket Over Coils Once the engine cover has been removed, you'll be able to see the four black plastic ignition coils. If you have access to compressed air or a wet/dry shop vacuum, thoroughly clean off the top of the engine to help reduce the chance of having debris fall down into the spark plug well. The two center ignition coils are partially obstructed by a silver metal bracket. The metal bracket is held in place by four bolts. Three of the bolts are 8mm and one is 10mm. 1st Bolt - Left Rear 2nd Bolt - Middle Left 3rd Bolt - Under Hose From left to right, the first bolt is 8mm, the second bolt is 10mm, the third bolt is an 8mm and the final fourth bolt on the far right side of the bracket is another 8mm. Loosen Counterclockwise Remove First Bolt 4th Bolt - Right Side Loosen the three smaller bolts by turning them in the counterclockwise direction with an 8mm socket and a 1/4" drive ratchet. Set the three 8mm bolts aside in a safe place. 8mm Bolt 8mm Bolt Small 8mm Removed One 10mm Larger Bolt 10mm Bolt Removed 1 10mm & 3 8mm Bolts Remove the larger bolt by turning it in the counterclockwise direction with the 10mm socket and a 1/4" or 3/8" drive ratchet. Set the 10mm bolt aside with the three 8mm bolts. Lift Up Metal Bracket Push Down Release Tab Use Plastic Pry Bar Tool Lift up the metal bracket and push it back a bit so that the two center ignition coils are clear. To help further reduce the risk of having debris or any other object fall down into the cylinder, I recommend only checking or changing one spark plug at a time. Push in the release button on the black plastic electrical connector. If the release tab is very stiff, you may need to use a plastic pry bar tool or a large flathead screwdriver to depress it. Power Plug Disconnected Loosen Counterclockwise Ignition Coil Bolt Removed Loosen the single silver metal bolt that secures the ignition coil in place by turning it in the counterclockwise direction with an 8mm socket and a 1/4" drive ratchet. Set the ignition coil bolt aside in a safe place. Lift Out Ignition Coil Spark Plug Well Loosen Counterclockwise Gently rotate the ignition coil back and forth a few times to make sure the rubber dust boot is not stuck or "frozen" to the top of the old spark plug. Set the ignition coil aside in a safe place. If you see a CEL (check engine light) or SES (service engine soon) warning indicator on your SUV's gauge cluster, use an OBDII scanner (also known as an OBD2 scan tool) to check for an ignition coil related DTC (diagnostic trouble code) such as P0350, P0351, P0352, P0353 and P0354. The OEM (original equipment manufacturer) ignition coil part number is Mazda PE2018100A also known as Delphi GN10625 (All of the information written on the side of the OEM coil was "GN10625 PE2018100 K6266 8X18 H6T61271".) A few other compatible replacement ignition coils with their part numbers include the following: Beck Arnley 1788527, NGK 48895, Standard Motor Products UF656 and United Motor Products COP574. Some of the most common symptoms of a failing or faulty ignition coil include misfiring, stalling, reduced fuel economy (lower MPG), backfiring, rough idling, loss of power and difficulty starting the engine. If necessary, attach an extension bar to your 14mm spark plug socket and the 3/8" drive ratchet. (A 9/16" spark plug socket will also work.) If you have trouble removing the old spark plug, you can try spraying a very small amount of penetrating oil down into the spark plug well. Allow the penetrating oil to seep into the threads and loosen any rust, sand or debris for about 10 to 15 minutes. Detach Ratchet - Spin Out Lift Out Old Spark Plug Inspect Old Spark Plug Once the old spark plug is loose, detach the ratchet. Spin out the old plug the rest of the way by hand with the extension bar. Carefully lift the old plug straight out of the well and detach it from the socket. Your socket should have a rubber insert or a strong magnet to hold the spark plug in place. Inspect the condition of the old OEM spark plug. If the electrode tip of the old plug appears to be oily or covered in black soot, the engine may be burning oil and should be inspected by a professional mechanic. If the electrode tip of the old spark plug appears to be ashy white, the engine might have experienced over heating at some point in the past. Empty Spark Plug Well Lower In New Spark Plug Tighten Clockwise If you have a spark plug gap gauge tool, check the gap on the new spark plugs. The spark plug gap specification for the OEM NGK DILKAR7M8 (90288) spark plugs is 0.030". Most spark plug manufacturers recommend that you do NOT apply anti-seize lubricant grease to the threads of the new spark plug. Anti-seize grease is a lubricant and can easily lead to over tightening. Push the new spark plug into the socket. Carefully lower the new spark plug down into the well. Try to avoid hitting the electrode tip against the side walls of the spark plug well or the cylinder head. Spin in the new spark plug by hand in the clockwise direction to help prevent it from becoming cross threaded. Attach the 3/8" drive ratchet and continue tightening the new spark in the clockwise direction until it is snug. If you have a very reliable and sensitive torque wrench, the Mazda CX-9 shop manual specification for tightening the spark plugs is 14 lb-ft or 18.98 N-m. If you insist on using a torque wrench, please verify the correct torque specifications for your vehicle. Note - I have never used a torque wrench to tighten spark plugs. The guideline to remember is that new plugs (with a new gasket / crush washer) should be tightened to about 3/8 of a turn past finger tight. You might actually feel when the new crush washer compresses / collapses. If you are re-installing old plugs after checking their condition, just tighten them to about 1/4 of a turn past finger tight. (The spark plug torque specification for the Mazda CX-5 with the Skyactiv-G 2.0L I4 engine is very similar at 12 to 14 lb-ft or 15 to 20 N-m.) Try to avoid over tightening the spark plugs. They should be snug but not extremely tight. Apply Dielectric Grease Lower In Ignition Coil Push In Ignition Coil Apply some dielectric grease to the opening in the black rubber dust boot at the bottom of the ignition coil. The dielectric grease will help ensure a more reliable electrical connection by preventing dust, debris and moisture from entering the dust boot. Lower the ignition coil down into the spark plug well. Push down the ignition coil to make sure the rubber dust boot is secure over the top of the new spark plug. Rotate the coil back and forth a few times to help spread around the dielectric grease. Single Ignition Coil Bolt Spin In Bolt Clockwise Tighten 8mm Bolt Line up the bolt hole in the ignition coil with the corresponding hole in the valve cover. Spin in the ignition coil bolt a few turns by hand in the clockwise direction to help prevent it from becoming cross threaded. Tighten the bolt in the clockwise direction with the 8mm socket and a 1/4" drive ratchet until it is snug. Try to avoid over tightening the bolt to prevent from cracking the plastic ignition coil housing. Push On Power Plug Replace 10mm Bolt Tighten 10mm Clockwise Push the electrical connector straight on to the ignition coil. You should feel or hear the power plug "click" securely into place. Spin In 8mm Bolt - Left Tighten Bolt Clockwise 8mm Bolt Under Hose Once you are done replacing or checking the spark plugs, lower the silver metal bracket back into place. Spin in the three 8mm bolts and the one 10mm bolt a few turns by hand in the clockwise direction to make sure they don't become cross threaded. Tighten 8mm Clockwise Spin In Bolt By Hand Tighten Clockwise Double check that all of the bolts are tight before moving on to the next steps. Metal Bracket Secured Push On Plastic Cover Spark Plug Change Done! Lower the plastic cover down into place. Push on the cover to secure the rubber friction fasteners to the metal pegs on the top of the engine. Be sure to write down the spark plug change in your SUV's service records. The maintenance schedule in the owner's manual specifies that the spark plugs should be changed every 40,000 miles (or every 64,000 km). For more, please check out all of the 2016-2021 Mazda CX-9 DIY Repair & Maintenance Guides. What spark plugs does Mazda use?Genuine Mazda Skyactiv Spark Plugs (set of 4) PE5R18110.
When should I change my Mazda spark plugs?Eventually, at around 30,000 miles to as high as 40,000 miles, conventional spark plugs will wear out, which could cause stalling, starting problems and engine misfires.
How much are spark plugs for a Mazda CXSo it is important to have them replaced at the recommended intervals to keep your Mazda CX-9 running as smooth as possible. The average cost to have your spark plugs replaced starts at around $100 up to $300+, depending on the type of spark plugs needed.
Do upgraded your spark plugs make difference?A Noticeable Difference
Once your vehicle receives new spark plugs, you'll notice how much better your car feels while driving. You may notice such improvements as: Consistent and Optimal Combustion – Spark plugs that are in peak condition allow the combustion system to function at its highest potential.
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2022 mazda cx 9 spark plugs
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