Do you know the reason why the car ignition coil always burns out?

1. Principle of ignition coil


It is composed of main coil, secondary coil, magnetic core, switch triode and other auxiliary components. The main coil is charged by the battery, the secondary coil discharges the spark plug and ignites, and the triode is responsible for switching. The charging time is controlled by the battery voltage and the engine speed to ensure that the energy of each charge is consistent. There are two types of ignition coils: 3-wire and 4-wire. The 3-wire is the power supply positive, negative, switch control (ECU command), and the 4-wire has an additional ignition detection Wire, able to detect whether the spark plug ignites (whether there is discharge current in the secondary coil).


To put it simply, the ignition coil is a transformer, that is, the voltage of tens of volts is raised to tens of thousands of volts, but the voltage input to the primary coil is provided by the electronic igniter.


2. Reasons for burning out the ignition coil


The main reason for the burnout of the ignition coil is the aging and breakdown of the insulating layer or the damage of the switch triode. The large gap between the spark plugs leads to a large load on the main coil, high heat generation, and rapid aging of the insulating layer. The small spark plug gap leads to a large discharge current of the secondary coil. Fast, the assembled ignition coil may have poor durability of insulating materials, large internal resistance of the coil, large heat generation, low quality of the tertiary tube, etc., and the service life will be shorter.


If it is always burned out, it will burn out soon after replacement. What is the reason? Here are some of them:


1. Let's first look at the problem of the generator. If the power generation is too high, the ignition coil will be easily burned out if the load is too heavy. However, if the power generation is too high, the body electrical appliances, such as light bulbs, will often be damaged; of course It does not rule out the quality problem of accessories, so it is best to measure the power generation first.


3. The spark plug gap is too large, adjust the gap or replace the spark plug;


4. If the gasoline quality is not good, try changing the gasoline with a higher grade;


5. The cylinder compression ratio is wrong, adjust the compression ratio;


6. If there is a program failure on the computer board, you can go to the repair shop to use the computer to check the car and clear the wrong information. If it still doesn't work, there may be a problem with your car's transmission;

7. The power supply voltage is unstable;


8. The resistance of the high-voltage line is abnormal, replace the high-voltage line;


9. There is a short circuit in the secondary;


10. The primary current of the ignition controller is too high, causing the ignition coil to overheat;


11. It does not work well due to high temperature and high pressure waves;


12. There is a very small chance that the coil itself is the problem, you can try another brand;


13. The ignition integrated block is not working well;


The ignition coil itself is a transformer, which is like a transformer in a household appliance. When the voltage changes within the specified range, the transformer will not be burned. Usually, the transformer will be burned when the transformer is overloaded. This happens, so When solving this problem, we should try our best to find out the cause of the overload or the aging of the components.


If there is no fire or weak sparks suddenly during driving, an infrared thermometer or hand touch can be used to determine whether the ignition coil or ignition module has an internal short circuit or open circuit fault. When judging the fault, it can also be restarted. No matter whether it can be started or not, the temperature of the ignition coil casing can be measured to judge.


①The ignition coil is overheated: the surface temperature of the ignition coil is greater than 95℃, indicating that the ignition coil is short-circuited and must be replaced.


②Ignition coil is too cold: The surface temperature of the ignition coil is equal to the ambient temperature at startup, indicating that the ignition coil is broken inside and must be replaced.


③ Overheating of the ignition module: the temperature of the ignition module is higher than 100 ℃, indicating that the ignition module is short-circuited and must be replaced.


④Ignition module is too cold: The ignition module and ambient temperature are equal at startup, indicating that the ignition module is internally open and must be replaced.


Haiyan is a professional ignition coil supplier in China, with years of manufacturing and wholesale experience, welcome to contact us!

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