How to Test if an Ignition Coil is Good or Bad?

[Daniel]

Determining the condition of an ignition coil involves: When the car is idling, if the shaking sensation is very noticeable, you can observe the exhaust pipe outlet. If the exhaust gas shows obvious intermittency and you can hear a sputtering sound, it can basically be concluded that the ignition coil is damaged. Introduction to Ignition Coils: 1. The reason an ignition coil can transform the low voltage from the car into high voltage is due to its similar structure to a regular transformer, with the primary coil having a much higher turn ratio than the secondary coil. 2. However, the working method of an ignition coil differs from that of a regular transformer. A regular transformer operates at a fixed frequency of 50Hz, also known as a power frequency transformer. In contrast, an ignition coil operates in pulse form and can be considered a pulse transformer. It repeatedly stores and releases energy at varying frequencies depending on the engine's speed.