SEQUENCE OF WORKS
Fig. 9.8. Location of the mounting brackets for fixing the electrical connector of the ignition unit
1. Compress the fastening brackets and disconnect the electrical connector from the ignition unit (Fig. 9.8).
2. Check that the high-voltage wire tips and universal electrical connectors are securely connected to the ignition coil and control unit. Loose high-voltage wires may rise slightly in the contact bushings due to overheating, which will lead to misfires. Loose high-voltage wires on the spark plugs may cause current leakage and uncontrolled ignitions.
3. Check the ignition coil housing for cracks or traces of flame from sparking.
4. The wire contacts must not be oxidized and must be securely connected to the spark plug tips.
5. High-voltage wires connecting the ignition unit to the spark plugs usually do not cause problems for the normal operation of the ignition system. However, high secondary voltage values of the electronic ignition system place high demands on the quality of the wire insulation, since the insulation must protect the wire from moisture and salt solutions. Check the high-voltage wires; their insulation should not be worn or damaged. Damaged high-voltage wires must be replaced immediately. To detect unobvious damage, bend the wire in a suspicious place.
6. If a spark jumps to the ground through the wire insulation, a characteristic sound of an electrical discharge will be heard in the engine compartment.
7. In the dark, these spark discharges are very clearly visible. The reason for this may be a salt deposit on the wire insulation or abrasion of the insulation.