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.
Ignition timing is calculated by the ECM based on engine speed, engine load (mass air flow and throttle position), coolant temperature and knocking.
Replacing spark plugs
Car engines use Champion RYCLC87 or Sagem RFN58LZ spark plugs.
Spark plug gap 0.95±0.05 mm.
On the K7M and K7J engines, remove the tip of the high-voltage wire from the replaced spark plug
The K4M engine has four separate ignition coils.
The ignition coils are attached directly to the spark plugs.
Blow out the candle wells with compressed air
Unscrew the candle with a candle key
We take out the candle from the cylinder head candle well
We examine the candle and evaluate its condition by appearance.
Check the gap between the electrodes with a spark plug probe
Bend the side electrode of the spark plug if the gap is not correct.
We screw in the candles first by hand (without a knob), and then tighten with a torque of 25-30 Nm (2.5-3.0 kgcm)
We lubricate the tips of high-voltage wires with technical vaseline before installation.
When installing high-voltage wires, it must be taken into account that the numbering of the cylinders is carried out from the flywheel side.
Checking high-voltage wires
Opening the hood
Check the condition of the wires of the ignition system.
Wire insulation must not be damaged, and wire lugs must not be oxidized.
We install the car in a dark place, start the engine and open the hood.
Inspecting high-voltage wires.
If the insulation of the wires is broken, you will see a characteristic spark.
In this case, the high-voltage wires must be replaced.
Before installation, grease the wire lugs connected to the ignition module with grease.
Lubricate the ends of the wires connected to the spark plugs with technical vaseline.
Removing and checking the ignition module for K7M and K7J engines
Disconnect 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 test for pins 2 and 3.
If the resistance is different from the specified, replace the ignition module.
Lubricate the tips of the high-voltage leads before connecting with grease
Removing the ignition module
The ignition module includes two control electronic units and two high-voltage transformers (ignition coils).
Spark plug wires are connected to the outputs 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 exhaust (idle).
The ignition module is non-separable, it is replaced in case of failure.
With simple means, the ignition module can only be checked for breakdown or breakage of the secondary windings.
Disconnect the high-voltage wire lugs from the module
Press the latch and disconnect the wiring harness block
We unscrew the three screws securing the ignition module
Remove the module.
Install the parts in reverse order.
We tighten the module fastening bolts with a torque of 15 Nm
Removing the ignition coils of the K4M engine
Disconnect the wire block by pressing the latch
With a 10 head, unscrew the ignition coil mounting bolt
Remove the ignition coil
Checking the ignition coils is described in the article - Possible malfunctions of a Renault/Dacia Sandero
