Cause of engine jitter (ignition system abnormality) :
Ignition coil: provides energy for spark plug generation. If the ignition coil is faulty, the ignition quality will be directly affected, resulting in a large amount of carbon deposition, which will be more serious at high speed. The ECU in this position monitors the working status of the ignition system through deflagration sensors. Professional maintenance personnel can judge the specific location of the abnormality through the ECU. In operation, the installation of the ignition coil must pay attention to its sealing state, the air under the coil must be excluded, otherwise the expansion of the gas after heat will make the ignition coil pop out, resulting in engine jitter.
Spark plug: In the cold start of the vehicle due to the internal temperature is not enough, the lubricating effect of the oil is limited, the resistance will be relatively large, need to inject more oil to ensure the power requirements, so the spark plug ignition gap is very important, the larger the gap, the smaller the energy. Mixture atomization effect due to the low temperature condition is bad, need while starting the engine ignition energy is higher, when launched the pilot time to work, the ignition of spark plug gap will gradually get bigger, but the location of the ECU can't detect the problem, still maintain before working condition, it will become smaller, the output of a cylinder engine jitter.
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