The ignition coil is an increases transformer that converts a low-voltage voltage coming from the generator or a battery to high-voltage used to ignite the air-fuel mixture. Modern car ignition coils have nothing more like an induction coil of the famous engineer Henry Rumkorf, which was patented in 1851. This invention could form an arc to thirty centimeters long and turned out to be so successful that Rumkorf in 1858 received the Napoleon III cash premium for him with the definition of "for a very important discovery in the field of electricity use." Its size was fifty thousand francs.

Ignition coil Purpose and principle of work

The ignition coil is an increase in DC transformer. Its main purpose is to generate high-voltage current necessary to ignite the air-fuel mixture.

The principle of operation of the coil is based on the appearance of high voltage current in the secondary winding during the passage of low voltage current in the primary winding.

When the spark is necessary, the contacts are opened in the ignition interrupter distributor. At this moment, the primary winding circuit bursts. The high-voltage current is fed to the central contact of the coil and rushes to that contact on the lid, opposite which the electrode runner is currently located. Next occurs the circuit, and the pulse passes the ignition candle one from the cylinders.

As a result of low reliability of distributors, in modern transport, systems are used with separate ignition coils for each candle. Due to this, an increase in the energy of sparking and a decrease in the level of radio cells created by the ignition system. In addition, a scheme with separate coils made it possible to get rid of the use of unreliable high-voltage wires.

Symptoms of the ignition coil malfunction, symptoms

The main signs of the ignition coil malfunction are:

1. Vehicle does not start.
2. Reduced motor performance.
3. Dips on certain revs.
   
4. Pass in the ignition.
5. Overheating coil.
6. Bending Engine signal lamp flashing.

It is worth noting that the output of the coil can be facilitated by the following factors:

1. Damage to insulation as a result of high voltage. This phenomenon can be observed when the voltage is exceeded.
2. Overload arising from the malfunction of the ignition candle or high-voltage wire.
3. Strong vibration and heating, as a result of which disruption of the device isolation. The ignition coil is distinguished by the presence of several layers of isolation. When damaged, there is a test of insulation, which leads to a short circuit or even to the cliff of the chains.

How to check the ignition coil multimeter

This instrument makes it possible to obtain the most accurate information about the work of the coil and makes it possible to do this without consequences for the instrument being checked. However, in order to obtain results, you need to know how to check the ignition coil using the multimeter, for which the windings resistance are measured.

In addition, so that after receiving the measurement results, make certain conclusions, you need to know that the characteristics of the ignition coils are capable of very different.

All coils have the following main specifications:

1. A spark discharge current.
2. The energy of the spark discharge.
3. The duration of the spark discharge.
4. Inductance of the primary winding.
5. Resistance to both windings.

Therefore, you should find out the characteristics of the tested coil before measuring.

During the testing of the primary winding, it is necessary to connect wires to measure it to its "positive" and "minus" contacts. Normal primary winding resistance for most coils is 0.4 - 2 ohms. But there are exceptions. To avoid errors, specify the optimal resistance indicators for a separate device.

The following results of measurements are indicated about the fault of the coil:

1. Too high resistance, which indicates the likely cliff in the chain.
2. Zero resistance, which is observed during a short circuit in the device.

In addition, a secondary dimension should be made, which is made between the high voltage conclusion and the positive contact of the coil.

Tools assistants

1. New ignition coil.
   
2. The end heads on the "10" and "8".

Replacing the ignition coil VAZ2107, detailed instructions

1. First of all, it should be removed from the rechargeable battery minus terminal.
   
2. Then it is necessary to remove the central high-voltage coil output wire, for which pull it up with minimal effort.
   
3. Next, you need to unscrew the fastening nuts of the terminals of the wires that are connected to the contacts of the coil.
   
4. Now dismantle the coil itself, for which you need to unscrew the two nuts of its attachment.
5. After removing the coil, we set a new one in its place.
   
6. We collect everything in the reverse order.

Tips of professionals

So that the coil served for a long time, you should systematically pay attention to the state of contacts and keep clean the device in cleanliness. Replace the coil on its own quite simple, but it is even easier to carry out preventive technical inspections in a timely manner, as well as to care for nodes and vehicle units to avoid faults.