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Investigate ignition coil ablation problem

December 22,2022

According to the instructions of the engine management system ECU, the ignition coil outputs high voltage to the spark plug for ignition at the specified time corresponding to the energy required by the working conditions (see the figure below). The ignition coil itself is a transformer, just like the transformer in household appliances. 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, so when solving the problem We're going to find out what's causing the overload.

1

Frayed engine wiring harness reason

2

The aging, wear and short circuit of the vehicle circuit, that is, the wear and tear of the wiring harness and the grounding cause the ignition coil to be continuously charged and overloaded to cause ablation. There are many historical cases of this kind of situation, and the frequency of failures shown is continuous, and it will reappear after replacing the new ignition coil. It is suggested that such a failure should be eliminated first during maintenance, otherwise the failure will not be eliminated after spending time, effort and money.

1. Engine vibration:

Once the ignition coil is damaged, as the spark plug cannot penetrate and ignite the combustible mixture, it is very easy to cause the engine to lack cylinders, resulting in severe vibration. If there are too many missing cylinders or two adjacent working cylinders are missing cylinders at the same time, the engine will most likely not start normally.

2. Increased fuel consumption and decreased power:

Even if the damage to the ignition coil does not cause the engine to lack cylinders, the combustion of the combustible gas mixture in the engine will still be affected due to the weakened spark plug flashover capability, resulting in adverse reactions such as increased fuel consumption and decreased power.

3. A large amount of carbon deposits are produced:

When the flashover ability of the spark plug is weakened, it will also cause incomplete combustion of the combustible mixture, and the incomplete combustion of the combustible mixture will produce a burning substance called carbon deposits, and the car The exhaust will also emit black smoke.


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