What is the purpose of replacing spark plugs in a vehicle?
2 Answers
The purpose of replacing spark plugs in a vehicle is: 1. To introduce the high-voltage electricity generated by the ignition coil into the engine cylinder; 2. To generate sparks between the spark plug electrode gaps to ignite the air-fuel mixture, ensuring the engine operates normally. The components of a spark plug include the terminal nut, insulator, terminal stud, center electrode, side electrode, and shell. The steps for removing spark plugs are: 1. Clean any dust or debris around the spark plug area using compressed air or a soft tube to blow it away; 2. Ensure the engine is in a cold state before proceeding; 3. Immediately protect the spark plug hole after removal to prevent any debris or dust from entering the cylinder; 4. Avoid damaging the insulator ceramic when using a wrench; 5. When adjusting the spark plug gap, do not bend or strike the center electrode.
Replacing spark plugs mainly helps the engine run more smoothly. After I changed them myself last time, I clearly felt the throttle response became much quicker, and the engine no longer shakes like a sieve during cold starts. This is because new spark plugs have stronger ignition capability, allowing gasoline to burn more completely, which also slightly reduces fuel consumption. Over time, the electrode gap on old spark plugs widens, which can easily cause misfires or insufficient power, and in severe cases, may even damage the catalytic converter. Regularly replacing spark plugs is actually preventive maintenance, similar to getting regular health check-ups—spending a little to avoid major repairs. It's recommended to check them every 40,000 to 50,000 kilometers, and replace them if you notice significant electrode erosion or carbon buildup.
