![]() ![]() The words “ignition coil” are used very generically in the automotive world. Fuel has a distinct smell, so you are going to notice the unburned gas as it exits. The result is an excess of gas coming out of the exhaust. If it doesn’t, there’s going to be an imbalance of fuel and air going through the engine. The ignition system is responsible for igniting the air-fuel mixture in each cylinder. If you have trouble getting the engine started, consider that the ignition coil or other components in the system could be the fault. This problem is often seen most often when trying to start the engine. If the spark plug isn’t receiving the proper amount of voltage from the ignition coil, the mixture won’t ignite properly. To start the engine, there must be a spark igniting the air-fuel mixture at the right time. You want the engine to run as efficiently as possible and you don’t want to spend more money on fuel than needed, so it’s best to replace the bad ignition coil as soon as possible. In fact, if you are watching the gas mileage, you should notice problems before other symptoms appear. As the coil goes bad over time, you should notice a decrease in fuel economy. Poor Fuel EconomyĪn ignition coil can fail spontaneously or over time. Eventually, you will start to worry about the engine stalling. As you push down the accelerator, you might notice the engine struggling more than normal.Īs the rough ride gets worse, the cabin will start to vibrate. It can be felt when you are driving as well. The rough-running engine won’t only occur while idling. ![]() It can also indicate a problem with the fuel injectors, spark plugs, air filter or exhaust. If it becomes rough, there could be an issue with the ignition coils. In general, the engine idle should be smooth and predictable. You can also leave the engine idling when you are parked and waiting. You leave the engine idle when you are stopped at a traffic light or intersection. Rough IdleĮngine idling defines the time when the motor is running, but the car isn’t going anywhere. This situation leaves you stuck wherever you are when the engine stalls. In severe conditions, you won’t be able to restart the car engine. This happens when combustion doesn’t occur as it should. If the bad ignition coil is unable to keep the engine running, it’s going to stall. You can also feel the vibration throughout the cabin as the misfire gets worse. Misfiring engines create a hesitation or jerking feeling, especially as you attempt to accelerate. ![]() A misfiring engine occurs because the air-fuel mixture in the cylinder can’t ignite. When the ignition coil doesn’t work correctly, the engine is going to misfire. ![]() If the light is flashing, you should turn off the car immediately to protect the engine from damage. However, further damage can occur if you keep driving. If the Check Engine Light is solid, you may have time to repair the problem before it becomes severe. You may also get a generic engine misfire code. If you use your compatible code scanner, you may see a P0300 – P0312 ignition code or something manufacturer-specific. Bad ignition coils usually cause the Check Engine Light to come on. ![]()
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