If you are using more gas than usual, losing power or have a rough running engine, worn or dirty spark plugs could be the problem.
Spark plugs create a high voltage spark that ignites the air and fuel mixture in the cylinders. They are part of the ignition system which has many components including the generator, coils, wires and the engine computer. All these components need to be working in harmony to achieve maximum power and fuel efficiency.
If your engine is running rough or is hard to start you should have your vehicle checked as soon as possible. A flashing Check Engine light is another sign that you may have a bad plug. This light will flash if there is an excess amount of unburned fuel in the exhaust.
Driving a poorly running vehicle can also lead to overheating and major engine damage.
Years ago, spark plug maintenance was a yearly ritual. Because of improved spark plug design, the use of unleaded gas and modern engine technology, spark plugs can last up to 100,000 miles.
For most cars, the average life expectancy of spark a set of spark plugs is 30,000 to 60,000 miles. Many factors can cause premature spark plug failure. Hard driving, towing, stop and go driving or poor gasoline quality can all cause spark plugs to fail prematurely.
Follow your owner's manual for the recommended service interval for your specific vehicle, or ask your dealer Service Department Manager.
Schedule ServiceThe average cost to replace all the plugs in an average four-cylinder vehicle is between $200 to $300 dollars. The cost can increase significantly if your vehicle has a six, or eight-cylinder engine.
Some vehicles have hard to reach spark plugs, and it may be necessary to remove manifolds and other components to reach the plugs which adds to the labor cost.
If a vehicle has more than 50,000 miles other components may need replacement which can add to the overall cost. These can include spark plug wires, coils, or even engine repairs.