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With the development of automobile gasoline engines in the direction of high speed, high compression ratio, high power, low fuel consumption and low emission, the traditional ignition device is no longer suitable for use. The core components of the ignition device are the automobile ignition coil and the switch device. If the energy of the ignition coil is increased, the spark plug can generate sparks with sufficient energy, which is the basic condition for the ignition device to adapt to the operation of modern engines.
The reason why the car ignition coil can turn the low voltage on the car into a high voltage is because it has the same form as the ordinary transformer, and the turns ratio of the primary coil to the secondary coil is large.
However, the working method of the automobile ignition coil is different from that of ordinary transformers. The ordinary transformer works continuously, while the automobile ignition coil works intermittently. It repeatedly stores and discharges energy at different frequencies according to different engine speeds.
After using it, the car ignition coil can be replaced once every 100,000 kilometers, because the ignition coil is defective, so the ignition coil may need to be replaced after 90,000 to 100,000 kilometers. But as a result of the improvement of the ignition coil, it generally does not need to be replaced.
In addition, there is no replacement cycle for the ignition coil of a car, and it is replaced only when it is broken. Generally, the replacement of the ignition coil of a vehicle usually occurs after 100,000 kilometers.
Ignition coils do not wear out and therefore do not need to be replaced as long as they are working properly. When replacing, as you said, unplug the high and low voltage wires, and remove the old "ignition coil". Fix it during installation and then plug in the high and low voltage lines.
After replacing a new car ignition coil, there are three ways to check whether its wiring is correct:
1. Use a voltmeter to measure the fit
Connect the "+" test lead of a 0~50V ordinary DC voltmeter (or the corresponding gear of the multimeter) to the ground (to the body), and connect the test lead to the connection between the spark plug of any cylinder and the high-voltage line. When the engine is running, if the pointer of the voltmeter moving to the right means that the ignition wire W is connected correctly, that is, the center electrode of the spark plug is negative.
2. How to check and judge with a pencil?
①Pull out the high-voltage wire of any cylinder from the spark plug, so that the distance between the end of the high-voltage wire and the spark plug is 6mm for flashover.
② Then place a sharpened pencil tip in the gap where the spark is flashing. If there is a light blue spark between the pencil lead and the spark plug, it means that the center electrode of the spark plug is negative, and the wiring of the car ignition coil is correct.
③If orange sparks are generated between the pencil lead and the high-voltage line, it means that the center electrode of the spark plug is positive, and the wiring of the car ignition coil is wrong, and the connection line of the low-voltage terminal of the ignition coil should be replaced.
3. Use a neon tube to check and judge
Use the neon tube in the ordinary electric test pen to be close to the high-voltage line. When the car starts, the end close to the high-voltage line does not light up, indicating that the center electrode of the spark plug is negative, and the wiring of the ignition coil is correct.
Conversely, if the neon tube lights up when the car is started near the end of the high-voltage line, it means that the wiring of the car's ignition coil is wrong, and the connection line of the low-voltage terminal of the ignition coil should be replaced.
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