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How to judge the failure of ignition coil


The car ignition coil is the core component of the engine ignition system and is responsible for intermittently converting the low-voltage power of the vehicle into high-voltage power. If the ignition coil does not convert high-voltage electricity, the combustible gas mixture in the cylinder will not be effectively decomposed and ignited, thus preventing the engine from working properly.

This shows that the ignition coil plays an important role in the engine. So what happens if the ignition coil is slightly damaged? And what are the fault phenomena of it?

The ignition coil is slightly damaged

Under normal circumstances, the main symptom of slight damage to the ignition coil is the weakening of the spark plug spark. The specific phenomena are as follows:

Increased fuel consumption and decreased power: As the spark plug's ability to spark is weakened, the combustion of the engine's combustible gas mixture will be affected, resulting in adverse reactions such as increased fuel consumption and decreased power.

A large amount of carbon deposits are generated: due to the weakening of the spark plug's ability to spark, the incomplete combustion of the combustible gas mixture will result, and the incompletely combustible gas mixture will produce a charred substance called carbon deposits, and the car exhaust pipe will also Black smoke.

Failure phenomenon of ignition coil

In general, there will be as many ignition coils as there are cylinders in the engine, and if a certain ignition coil is severely damaged, causing the spark plug sparks to be insufficient to break through the ignition of combustible gas mixture or not to jump at all, the engine will lack Cylinder phenomenon.

How to judge the failure of ignition coil 

When you find one of the following phenomena in the car, you can basically conclude that there is something wrong with the ignition coil:

One is that the body shakes significantly at idle speed. Observe the exhaust pipe mouth, the exhaust gas flow from the car is obviously intermittent, and at the same time, the exhaust pipe shakes badly, and the sound of "sudden" can be clearly heard.

The second is that during the driving process, when the speed is below 2500 rpm, the body has obvious jitter and acceleration is weak; when the speed exceeds 2500 rpm, the sense of jitter disappears.

The third is to open the engine cover, observe the running engine, and find that the engine has obvious jitter. This kind of jitter has obviously not belonged to the version jitter under normal engine working conditions, and the jitter amplitude is very large.

If only one ignition coil fails, the remaining three cylinders are working normally, barely emergency driving is not a problem, but it is very unfavorable to the car's engine, chassis and connecting parts. An auto repair master at a designated service station of Bora advised the owner to temporarily stop using the missing cylinder vehicle. If more than one cylinder's ignition coil is burned, it is recommended to stop driving immediately.

In addition, driving a vehicle that lacks a cylinder due to a faulty ignition coil is very detrimental to driving safety. On the uphill slopes, especially the roads that need to be "hilled up", the engine load of the cylinder-deficient vehicle is increased, the body shake is more obvious, and it is very prone to instantaneous fire. If you really have to move the vehicle, you should keep the speed above 2500 rpm as much as possible.