Check your car’s MOT status and schedule an appointment with a mechanic if you’re experiencing slow acceleration, lack of power, poor fuel efficiency, engine misfires, or trouble starting your car. These are all signs that your spark plugs are malfunctioning.
Spark plugs, like engine oil, fuel filters, and air filters, need to be serviced and maintained on a regular basis to keep your engine operating smoothly. Spark plugs must be changed every 30,000 to 50,000 miles in most cars.
Some modern vehicles on the other hand, feature improved ignition systems that theoretically eliminate the need for spark plug replacement. There are times when a spark plug wears out or exhibits indications of failure, regardless of any warranties or promises made by the car manufacturer.