Ignition is a key element necessary for the operation of any gasoline engine. The ignition system delivers a spark in a timely manner to the cylinder, where the piston has already compressed the fuel mixture and ignites it. As a result, the gases expand, press on the piston. Further, the movement is transmitted to the connecting rod, which, in turn, rotates the crankshaft.
Ignition VAZ 2108
The ignition setting on the G8 depends on the preferred fuel and engine (2108, 21081 or 21083). The ignition for each motor is respectively set with a certain lead angle.
To set the ignition you need:
- Tachometer.
- Strobe light
- The key is 10.
But, as practice shows, interruption or untimely supply of sparks can be caused not only by inaccurate ignition settings. The reason can be broken candles, insufficient compression , a broken ignition coil, a faulty switch.
The VAZ 2108 switch is an element of the ignition system that is responsible for supplying control pulses to the coil and optimizing the efficiency of the spark. The quality of the pulse is determined in special conditions. After the VAZ engineers installed a two-channel switch in the ignition system, the engine operation changed for the better:
- A more powerful spark appeared.
- Idling has become more stable.
- Starting the engine in cold weather became more effective.
- Reduced fuel consumption.
- The power loss of the spark in the distributor disappeared.
Malfunctions in ignition
Identifying and fixing all problems is fairly simple. You can check the candle to pain in a simple way, if there is no necessary device. They do it like this: on an engine that has been started, the armored wires are removed from each cylinder in turn. If the armored wire is removed, but this did not affect the operation of the engine, it becomes clear that the reason lies precisely in this candle.
Checking the coil is a little more difficult. You will need to borrow the same spare part, but 100% working. If the problem disappeared after replacing the coil, it means that it was the faulty one.
The presence or absence of an impulse can be checked with a warning lamp. It often happens that malfunctions in the ignition system happen during a trip. And far from always, the car owner will have a spare switch for the VAZ 2108, an ignition coil, a set of candles and so on. In this situation, you can ask for help from travelers or turn to the services of a tow truck. The cost of the latter service will certainly not please the driver.
To get out of this situation and go on their own further, you must first find out the cause of the malfunction. Verifying the switch is done in many ways. But for many methods, you need to use special instruments and equipment.
Troubleshooting methods
In road conditions, you can check the switch. Disconnect the wire that goes from pin 1 and connect the bulb (12 volts) to the gap. When you crank the crankshaft, the light should periodically light up. This means that the VAZ 2108 switch is operational.
You can check it differently: disconnect the wire from the distributor and insert a regular paper clip into the central contact. Connect the latter for a short time (1 second) to the distributor housing. Put the high-voltage armored wire from the ignition coil onto the brake master cylinder with a contact gap of 1 centimeter.
After these simple operations with the ignition on, a spark should appear. If the latter appeared, the switch is operational.
For motorists who are not at all versed in electronics, it is easier to replace a defective part. It is not at all difficult to take a known-good element and include it in the system. Using deduction, you can find the fault. As practice shows, the coil is the least likely to fail, after it the distributor, then the candles and the switch.
Wiring diagram of the VAZ 2108 switch
The VAZ 2108 switch has 7 numbered contacts. Each of them performs a specific function and is connected to a separate element. Namely:
- To the ignition coil.
- To the electronic switch (on the case).
- To the ignition switch contact .
- To the battery.
- On the hall sensor.
- To the ignition distributor.
- Used for control signal in electronic tachometers and control devices.
In general, connecting a VAZ 2108 switch is a simple process even for an inexperienced car owner. There should be no problems during the standard replacement or installation of this spare part. In extreme cases, everyone can use the help of a specialist or literature on the repair and operation of a VAZ car of the desired model. The connection diagram of the VAZ 2108 switch does not have any special difficulties.
The main thing
Whatever one may say, VAZ is a car created without any modern and innovative technologies. Repair of such a car in 80% of cases is carried out by the owner.
Not an exception - repair of the ignition system of this car. The VAZ 2108 switch is the most vulnerable part in this system. Skilled craftsmen know that for the G8, a switch from some models of Audi, Volkswagen and other brands of cars is suitable.
A spare part from a foreign manufacturer shows a higher resource without loss in impulse and spark production.