How Many Spark Plugs Need to Be Replaced in a Car?

[McKendra]

When replacing spark plugs in a car, you need to replace four or six. The steps for replacing spark plugs are: 1. Remove the spark plug cap when the engine is cold; 2. Unscrew the old spark plug counterclockwise; 3. Screw in the new spark plug clockwise; 4. Reattach the spark plug cap; 5. After replacing the spark plugs, check for any errors and start the engine to test. Situations where a car needs spark plug replacement include: 1. Abnormal engine shaking during acceleration; 2. Idle shaking; 3. Difficulty starting. Spark plugs are a crucial component of a gasoline engine's ignition system. Their main function is to introduce high voltage into the combustion chamber, causing it to jump across the electrode gap to produce a spark, thereby igniting the combustible mixture in the cylinder.