The ignition system of car engines consists of an ignition module, high-voltage wires and spark plugs.

During operation, it does not require maintenance and regulation.

The ignition advance angle is calculated by the electronic unit depending on the speed of the crankshaft, the load on the engine (mass air flow and throttle position), the coolant temperature and the presence of detonation.

Spark plug replacement

Champion RYCLC87 or Sagem RFN58LZ spark plugs are used on car engines.

Spark gap of the candle is 0.95±0.05 mm.

Replacement of Renault Sandero ignition system elementsReplacement of elements of the ignition system of the Renault Sandero car

On the K7M and K7J engine, we remove the tip of the high-voltage wire from the replaceable spark plug

Four separate ignition coils are installed on the K4M engine.

The ignition coils are attached directly to the spark plugs.

Replacement of Renault Sandero ignition system elementsReplacement of elements of the ignition system of the Renault Sandero car

Purge the candle wells with compressed air

Unscrew the candle with a candle wrench

Replacement of elements of the ignition system of the Renault Sandero car

Removing the candle from the candle well of the cylinder head

Replacement of Renault Sandero ignition system elementsReplacement of Renault Sandero ignition system elements

We examine the candle and evaluate its condition by appearance.

Check the gap between the electrodes with a candle probe

Bend the side electrode of the candle if the gap does not correspond to the norm.

The candles are screwed in first by hand (without a collar), and then tightened with a torque of 25-30 Nm (2.5-3.0 kg cm)

Replacement of elements of the ignition system of the Renault Sandero car

The tips of high-voltage wires are lubricated with technical vaseline before installation.

When installing high-voltage wires, it should be taken into account that the numbering of the cylinders is carried out from the flywheel side.

Checking high-voltage wires

Opening the hood

Replacement of elements of the ignition system of the Renault Sandero car

Check the condition of the ignition system wires.

The insulation of the wires should not be damaged, and the wire tips should not be oxidized.

We install the car in a dark place, start the engine and open the hood.

We inspect the high-voltage wires.

If the insulation of the wires is broken, you will see a characteristic spark.

In this case, the high-voltage wires need to be replaced.

Replacement of Renault Sandero ignition system elementsReplacement of elements of the Renault Sandero ignition system

Before installation, lubricate the wire tips connected to the ignition module with grease.

We lubricate the tips of the wires connected to the spark plugs with technical vaseline.

Removing and checking the ignition module of the K7M and K7J engines

Replacement of Renault Sandero ignition system elementsReplacement of elements of the Renault Sandero ignition system

Disconnect the tips of the high-voltage wires from the ignition module

We connect the tester in the resistance measurement mode to the high-voltage terminals of the ignition module.

The resistance of the secondary winding should be about 7.0 kOhm.

Repeat the check for pins 2 and 3.

If the resistance differs from the specified one, replace the ignition module.

Replacement of elements of the ignition system of the Renault Sandero car

Lubricate the tips of the high-voltage terminals before connecting with grease

Removing the ignition module

The ignition module includes two electronic control units and two high-voltage transformers (ignition coils).

Candle wires are connected to the terminals of the high-voltage windings: to one winding - the 1st and 4th cylinders, to the other - the 2nd and 3rd.

Thus, the spark simultaneously jumps in two cylinders (1-4 or 2-3) – in one during the compression stroke (working spark), in the other during the release (idle).

The ignition module is non-removable, it is replaced when it fails.

By simple means, the ignition module can only be checked for breakdown or breakage of the secondary windings.

Replacement of Renault Sandero ignition system elementsReplacement of elements of the Renault Sandero ignition system

Disconnect the tips of the high-voltage wires from the module

We press the latch and disconnect the wiring harness pad

Replacement of Renault Sandero ignition system elementsReplacement of elements of the Renault Sandero ignition system

Unscrew the three screws securing the ignition module

Removing the module.

We install the parts in reverse order.

The module mounting bolts are tightened with a torque of 15 Nm

Removing the ignition coils of the K4M engine

Replacement of Renault Sandero ignition system elementsReplacement of elements of the Renault Sandero ignition system

Disconnect the wiring block by pressing the latch

Unscrew the ignition coil mounting bolt by 10 with the head

Replacement of elements of the ignition system of the Renault Sandero car

Removing the ignition coil

Checking the ignition coils is described in the article - Possible malfunctions of the Renault/Dacia Sandero car