Reasons for car body shaking, jolting, and ignition coil:

1. The engine is missing cylinders, one cylinder misfires and does not work, and the spark plug or ignition coil in one cylinder does not work. The troubleshooting method can be used to identify which cylinder is at fault. For example, pulling out the coils of one cylinder in sequence, if the shaking of the car worsens severely, it means that there is no problem with this cylinder; If there is not much change in the shaking of the car, it indicates that there is a problem with this cylinder, and then check whether the ignition coil and spark plug inside this cylinder are damaged.

2. The low-voltage plug has poor contact with the wiring harness, sometimes connecting and sometimes not, causing the engine to sometimes lack cylinders and sometimes be normal. For this phenomenon, fix the low-voltage plug with zip ties or replace it with a new plug.

3. The power cord connecting the ignition coil is broken, and the damaged part comes into contact with the engine housing, causing the ignition coil to be out of cylinder and the car to shake. When the car shakes, due to the vibration, the wiring harness jumps off the engine housing again, and the input current returns to normal, and the ignition coil works normally again. This intermittent phenomenon (of course, with a fast changing frequency) causes the car to shake and crash. Over time, it can affect the lifespan of the ignition coil and even damage the coil.

4. The parameter design of ignition coils in general factories is unreasonable, and the output voltage and energy of the coils are too low. Unable to ignite the spark plug normally or with low ignition effect. This will cause the car to shake and crash. Suggest replacing with original or genuine ignition coil products.