How to remove ignition coils on Lada Largus

The ignition system of the K4M engine consists of individual ignition coils and spark plugs for each cylinder.

There are no high-voltage wires in the ignition system - the coil tip is put directly on the spark plug.

The ignition system of the K7M engine consists of an ignition coil, high-voltage wires and spark plugs.

The K7M engine has an ignition module, which is a block of two coils.

The tips of the high-voltage wires are connected to the terminals of the secondary windings of the coils.

The current in the primary windings of the ignition coils is controlled by the ECU depending on the engine operating mode.

The coils are powered sequentially in pairs.

Thus, a spark simultaneously jumps in two cylinders (1-4 or 2-3) - in one at the end of the compression stroke (working spark), in the other - at the end of the exhaust stroke (idle).

Removing and installing coils

Removing the ignition coils of the K4M engine: 1 - ignition coil; 2 - ignition coil mounting bolt

Preparing the car for work. Using a 10 mm spanner, disconnect the negative terminal of the battery.

On the K4M engine, disconnect the wiring harness pads from the coils 1 (Figure 1).

Using an 8 mm head, unscrew the bolts 2 securing the ignition coils and remove them.

Before installing the ignition coils, replace the bolts 2 securing the coils and, if necessary, replace the coil sealing rings.

Before installing the coils, apply 2 mm of Fluostar 2L to the inner circumference of the ignition coil cap on the spark plug and ignition coil side.

Install the ignition coils 1 on the spark plugs, tighten and tighten the ignition coil mounting bolts. Tightening torque of bolts 14 Nm (1.4 kgf.m) (replaceable head 8, extension, ratchet, torque wrench).

Connect the wiring harness blocks to the ignition coils.

Connect the ground wire terminal to the battery (spanner 10).