Features of the ignition system (VAZ-2108)

The ignition system is contactless. It consists of a sensor-distributor of ignition 5 (figure 137), switch 4, ignition coil 3, spark plugs 6, ignition switch 7 and high-voltage wires with interference-suppressing tips. The power supply circuit of the primary winding of the ignition coil is interrupted by an electronic switch. Control pulses are supplied to the switch from a contactless sensor located in the ignition distributor sensor. The firing order of cylinders 1-3-4-2.



Ignition distributor sensor type (model) 40.3706, four-spark, unshielded with vacuum and centrifugal ignition advance regulators. Has a built-in microelectronic sensor that produces voltage pulses when a steel screen with slots passes through its groove.

The 36.3734 type switch converts the control pulses of the sensor into current pulses in the primary winding of the ignition coil.

Ignition coil type 27.3705 - with open magnetic circuit, oil-filled, sealed.



Spark plugs type FE65P.

Noise suppression tips type 31.3707.

Ignition switch type KZ81 (produced by Hungary) or 2108-3704005 (domestic production) with anti-theft device and with blocking against restarting the starter without first switching off the ignition. Some ignition switches can be with an additional ignition relay type 111.3747.

The article is copied from the website vazbook

Possible malfunctions of the ignition system, their causes and methods of elimination are given in table 21.