Symptoms for a Faulty Ignition Coil

An ignition coil, also called a spark coil, is an induction coil in a car’s ignition system, producing a high voltage from a low voltage supply (converting the automobile’s 12 volts into thousands of volts), which is required to create the electric spark in the spark plugs to ignite the engine’s air-fuel mixture. Some ignition systems only require a single coil for all of the cylinders, but some newer applications need more (one for each cylinder).

Ignition coils are very solid but still can be faulty due to many factors.

Since ignition coils are the part to generate the engine spark, engine performance issues will occur quickly if there is something wrong with them. Here are some symptoms that may be caused by a failing ignition coil.

  1. If the car only uses a single coil for all of the cylinders, a bad ignition coil will lead to no-start for the engine. Since a completely failing coil can’t generate the engine spark, then it may cause the car to stop starting.
  2. If a ignition coil has battery voltage at its positive terminal and is being grounded on and off by the ignition module or circuit but is not producing a spark, it may be faulty.
  3. Engine misfires, a rough idle, a loss in power and acceleration may be caused by a faulty ignition coil. Since an ignition coil plays an really important role in the ignition system, any issue with it may result in spark being damaged, which may cause engine performance issues.

There are only parts of the symptoms for a faulty coil mentioned-above. If you are not sure if the engine issue is caused by your ignition coil, you’d better ask someone professional to help you.

Here is a video about the symptoms and causes of a bad ignition coil:

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