How to Remove Spark Plugs from a Toyota Corolla?
2 Answers
Spark plugs primarily function under the control of the engine's computer, where the ignition coil generates high-voltage electricity that is introduced into the engine cylinder. This creates a spark across the spark plug electrode gap to ignite the air-fuel mixture, ensuring the engine operates normally. The method for removing spark plugs from a Toyota Corolla involves the following 3 steps: 1. Prepare a cool engine and tools: The operation should be performed on a cool engine, with the necessary tools such as a wrench, socket, and adapter ready; 2. Disconnect the plug and remove the ignition coil: In gasoline vehicles, spark plugs are located beneath the ignition coil, which is usually accompanied by a power supply plug nearby; 3. Unscrew the spark plug: Use an appropriate socket to loosen the spark plug, ensuring gentle handling to prevent dust from entering the combustion chamber.
I've taken apart the spark plugs on my Corolla several times myself, and it doesn't seem too difficult as long as you follow the steps. First, disconnect the negative battery terminal to avoid the risk of electric shock. Then, open the engine cover, locate and unscrew the four ignition coil fixing bolts, and pull out the coils to expose the spark plugs. You'll need a special spark plug socket tool, preferably a 16mm one, to gently twist them counterclockwise—don't use too much force to avoid breaking them inside. When removing the old spark plugs, be careful not to let debris fall into the cylinder; use a cloth or vacuum cleaner to clean the edges. Don't underestimate the torque—the recommended tightening torque for Corolla models is between 15 to 20 Nm. Regular spark plug checks are crucial; replace them every 30,000 to 50,000 kilometers to save fuel and improve performance. Doing it yourself saves money and hassle, and the tools only cost a few dozen bucks.
