What are the symptoms of worn-out spark plugs?
2 Answers
Symptoms of worn-out spark plugs include: 1. Difficulty starting the car when cold, noticeable jerking while driving, idle shaking, or decreased engine acceleration performance, all of which should prompt an immediate inspection of the spark plugs; 2. While driving, if you notice a lack of acceleration power or significant abnormal engine shaking after pressing the accelerator, it is likely due to deteriorating spark plug performance; 3. Difficulty starting or sudden engine stalling. The replacement intervals for spark plugs are: 1. Ordinary nickel alloy spark plugs need replacement approximately every 20,000 kilometers; 2. Platinum spark plugs should be replaced around 40,000 kilometers; 3. Iridium spark plugs can last between 60,000 to 80,000 kilometers before needing replacement.
I've been driving for over ten years, and recently I noticed that my car struggles a lot when starting. It often takes several turns of the key to get the engine going, and acceleration feels weak, even struggling to climb slopes. Fuel consumption has also significantly increased—a full tank now lasts less than 600 kilometers, which is dozens of kilometers fewer than usual. At idle, the engine runs unevenly, with RPM fluctuating up and down, and the car body even feels slight vibrations. When I took it to the repair shop, the mechanic said the spark plugs had accumulated thick carbon deposits due to prolonged use, and the worn electrodes reduced ignition efficiency, easily causing misfires. If not replaced in time, it could not only waste fuel but also potentially damage other engine components. After replacing the spark plugs, everything returned to normal immediately—smooth starts and powerful acceleration. I recommend checking your spark plugs every 20,000 kilometers or so to avoid regretting it only when it affects driving safety.
