Trouble starting your car Most people are not aware that having worn spark plugs can cause their car to have troubles when starting. Usually they assume it is a flat battery or being out of fuel. Having worn spark plugs will cause the ignition system to work harder. Faulty spark plugs can also cause your battery to drain. Harsh weather conditions increase the chance of worn spark plugs preventing the engine from turning over. If you notice your car struggling to start, you may want to take a look at the spark plugs as a possible cause | Engine misfire It is easily recognizable when an engine misfires. A misfire causes the car to halt for a split second then it continues on at its normal pace. How serious your misfire problem is will determine how often this will happen. Engine misfire means that the vehicle is not functioning as well as it should because one or more of its spark plugs aren’t firing properly. This could lead to a reduction in fuel economy, reduced engine power, or increased exhaust emissions | You notice a rough idle Idling occurs when your car is stationary, yet the engine is running. While idling, your engine runs at a lower RPM. When an engine has spark plugs that are performing properly, the sound should be continuous and smooth. When they are not working as they should, the engine will sound jittery and rough and it will stumble and produce a vibration that can be felt throughout your vehicle. You need to have this checked right away as ignoring this symptom can lead to costly and serious damage being done to your car |