What are the steps for replacing spark plugs in a car?
2 Answers
Steps for replacing spark plugs in a car: 1. After opening the engine hood, locate the position of the spark plugs and remove the engine decorative panel; 2. Disconnect the high-voltage coil plug, then use a socket wrench to remove the fixing bolts; 3. After loosening, use a magnetic rod to extract the spark plug; 4. During installation, use the magnetic rod to hold the new spark plug, align it with the hole, and insert it. Install all spark plugs using the same method. Spark plugs are a crucial component of the gasoline engine ignition system. They introduce high voltage into the combustion chamber and create a spark by jumping the electrode gap, thereby igniting the combustible mixture in the cylinder.
I've changed spark plugs several times myself, and I think it's something that needs to be done step by step. First, the car must be completely cooled down—a hot engine can easily burn your hands, so I usually wait half an hour after parking before starting. Next, disconnect the negative battery cable to prevent electric shock. As for tools, I commonly use a spark plug socket and a torque wrench, along with gloves and safety goggles for extra protection. When removing the ignition coil, gently pull off the wires to avoid damage. Then unscrew the old spark plug and check its color: if it's burnt and blackened, it might indicate a fuel mixture issue, requiring inspection of the air filter or fuel system. Before installing the new spark plug, clean the socket, hand-tighten it to the proper depth, and then use the torque wrench to tighten it to the manufacturer's recommended value—over-tightening can strip the threads. Finally, reconnect all wires and the battery, then start the car to check if the engine runs smoothly. The whole process takes about 30 minutes. Spending a bit on tools is much cheaper than going to a shop, and you can learn some skills along the way.
