A spark plug is a vital part in a car’s electrical system. To maintain excellent fuel efficiency and power in your car’s engine, your spark plugs should always be in good condition. Below are signs of failing spark plugs:

Your car is hard to start, particularly on cold mornings.

You get a slow response when you step on the gas pedal, basically your car does not accelerate as quickly as it used to.

You might notice a decrease in gas mileage. This means you need to gas up more often than before.

Your engine runs rough, this means the motor is not running smoothly on all cylinders and fuel ignition is not efficient in one of the cylinders.

You notice engine combustion problems. Usually, failing spark plugs cause the flow of electrical current to become erratic and uneven. Sometimes, the electric current flow is normal and sometimes the flow is abnormal.

To avoid spark plug failures in the future, you should replace it before it wears out. Ideally, you should replace spark plugs every two years if you own vehicles that make use of electronic ignition systems. If you own older models that have contact breaker points, spark plugs should be replaced every year.