Note: Before you start, see Chapter 3. Always turn the ignition off before disconnecting or connecting any component and when using a multimeter to check resistance. A voltmeter or multimeter with an impedance of 10 MΩ or more must be used to test the ignition system components.
1. Electronic ignition system components are usually very reliable. Most damage is caused by loose or dirty connections, or burnt lines due to dirt, dampness, or damaged insulation. Always check all electrical wiring carefully to rule out all other possibilities of damage
2. The old method of checking the ignition spark by holding the end of the high voltage wire a short distance from the engine is not recommended. You risk not only getting an electric shock, but also damaging the ignition coil or module. Likewise, never try "diagnose" misfiring by removing the high voltage wires one by one.
3. If you do not have sufficient experience to check the ignition system component, and if you do not have the required equipment, contact your Opel dealer. It is better to pay for the work of a specialist than to risk damaging the system.
4. If the engine does not turn at all, or turns very slowly, check the battery and starter. Connect a voltmeter to the battery terminals and disconnect the high voltage wire from the switch-distributor cover and ground it. When you crank the engine with the starter (no more than 10 seconds), note the battery voltage. If it is less than 9.5 volts, check the battery, its connections, starter and charging system.
5. If the engine cranks at normal speed but does not start, check the high voltage circuit by connecting the strobe light and cranking the engine with the starter. If the device glows, the voltage reaches the spark plugs, so you need to check the spark plugs themselves next. If there is no light, check the high voltage wires, directly behind the breaker-distributor cover, carbon brush and distributor runner.
6. If there is an ignition spark, check the fuel system (Sections 4A or 4B).
7. If there is no ignition spark, check the voltage at the ignition coil at the clamp "+" or "15"; it must be equal to the battery voltage (i.e. at least 11.7 volts). If the ignition coil voltage is more than 1 volt below the battery voltage, check the connections from the ignition switch to the battery and ground point. However, it should be noted that the ECU controls the power to the ignition coil; do not try "check" the ECU with anything other than special Opel test equipment. When testing any wiring to an ECU, always first disconnect the appropriate connector from the ECU so that there is no risk of damage to the unit due to voltages from the test equipment.
8. If the ignition coil receives normal input voltage, check the primary and secondary windings of the ignition coil (be guided Chapter 16). Replace the ignition coil if it is defective, but first check the condition of the low voltage wiring connections to ensure that the damage is not due to dirty or loose connectors.
9. If the ignition coil is in good condition, the damage may be in the amplifier module or distributor on the C16 NZ and C16 NZ2 engines, or in the amplifier or speed / crankshaft position sensor on the C18 NZ engine. You can quickly check these components as follows. Attach a low power lamp across the clamps (disunited) ignition coil low voltage wiring.
If the lamp flickers or burns when cranking the engine, the amplifier and distributor (C16 NZ and C16 NZ2 engines), or booster and speed/crankshaft position sensor (C18 NZ engine), are correct.
10. In this case, the entire low voltage wiring circuit is in good condition; and the fault, if related to the ignition system, must be in the high voltage circuit elements. They must be carefully checked as described above.
11. If the indicator or lamp does not light up, the damage may be in the amplifier or distributor (C16 NZ and C16 NZ2 engines), or in the booster or speed/crankshaft position sensor (C18 NZ engine). It should be noted that the most common cause "breakdowns" there may be a loose connection, between components directly or at low voltage circuit wiring connections.
If you suspect that there is such damage, you should contact your Opel dealer.
12. Intermittent misfires can either be due to a loose connection or an open in the low voltage circuit, or damage to the high voltage wiring on the runner side of the distributor
13. Turning off the ignition, carefully check the entire system. If special equipment is available, check the low voltage circuit as described in steps 7-11 above.
14. Make sure the ignition coil, distributor cap and high voltage wires are clean and dry. Check wires and spark plugs (replacement with known good), then check the breaker-distributor cover, carbon brush and distributor runner.
15. Regular cutoff is almost always due to damage in the breaker-distributor cover, high voltage wires or spark plugs. stroboscope (paragraph 5 above) check if high voltage is present on all high voltage wiring.
16. If there is no high voltage on any wire, damage is in this wire or in the cover of the breaker-distributor. If there is voltage on the wiring, then damage to the spark plugs; check and replace them if there is any doubt about their condition.
17. If no voltage is present, check the ignition coil; rotor windings can break under load.
18. If all components have been checked, but no fault can be found, contact your Opel dealer for testing on special equipment.
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