In addition to using a car diagnostic tool to check your car's ignition coil for a fault, there are a few other ways you can check if the problem is affecting your car's performance.
However, what steps you need to take depends on the type of ignition coil in your car. If the coil is placed near the spark plug, you must ensure that the engine is turned off before removing the spark plug wire from the ignition coil.
It's important to wear protective equipment because if you're not careful, you can get bumped. Go ahead and get a new spark plug, connect the matching wires to it, and remove the fuel pump fuse to disable it.
While you are holding the spark plug with pliers, ask your assistant to turn on the engine and watch for blue sparks in the spark plug gap.
If you don't see sparks at all or they are orange in color, it means the ignition coil on your vehicle must be replaced. You should put all the parts back in place when you're done checking.
Coils placed directly on the spark plug are easier to check because you just start the engine and let it idle. Pop the hood, find the first ignition coil bolt and remove it.
If the engine operation changes after removing the ignition coil bolt, it is working properly. After removing the faulty ignition coil bolt, the engine will continue to run without any changes, so just continue the process until you find the damaged ignition coil.