What are the steps for replacing spark plugs?
3 Answers
Steps for replacing spark plugs: Open the hood, lift the plastic cover of the engine, remove the high-voltage distributor wires, and mark each cylinder's position to avoid confusion. Use a spark plug socket to remove the spark plugs one by one. While removing them, check for any external debris like leaves or dust and ensure they are thoroughly cleaned. Place the new spark plug into the spark plug hole, hand-tighten it a few turns, and then use the socket to tighten it further. Reinstall the removed high-voltage distributor wires according to the firing order, and then secure the cover. Under normal maintenance conditions, replacement is recommended at 40,000 to 60,000 kilometers. However, this may vary depending on the brand and engine type, so it's advisable to follow the user manual. Refer to the following standards for maintenance replacement: Platinum spark plugs should be replaced at 40,000 kilometers, standard nickel alloy spark plugs at 20,000 kilometers, and iridium spark plugs at 60,000 to 80,000 kilometers.
Replacing spark plugs is quite important. I recommend preparing the tools first: new spark plugs, a spark plug socket, a torque wrench, and gloves. Wait for the engine to cool down for half an hour, then disconnect the ignition coil plug and remove the fixing screws to take out the coil. Use the socket to unscrew the old spark plugs counterclockwise, being careful not to let any debris fall into the cylinder. Apply some anti-seize compound to the threads of the new spark plugs and tighten them with the torque wrench to the specified torque—usually 15-20 Nm is sufficient for small cars. When reinstalling the ignition coil, make sure the plug aligns with the clip. After replacement, start the engine and listen for any unusual noises, and check if the idle is stable. Regularly inspecting spark plugs can save fuel, and working on a cold engine is safer.
Last time I changed the spark plugs myself and learned some lessons. After gathering all the tools, first disconnect the negative battery terminal to prevent short circuits. When removing the engine cover, be gentle as the plastic clips are prone to breaking. Replace them one by one instead of removing all at once to avoid debris entering. A spark plug socket with an extension bar is needed to reach the deep holes. Upon removal, I found the electrodes on the old spark plugs were completely worn down. Before installing the new plugs, always check the gap—some may need adjustment to 0.9mm. Finally, start the engine for a test drive; the throttle felt more responsive, and fuel consumption indeed dropped by about 0.5L/100km. If you're doing it yourself, it's advisable to consult your vehicle's manual beforehand.
