Warning! Observe safety precautions to prevent electrical shock. Turn off the ignition before connecting appliances.
Carburetor engines without converter
Ignition failures are usually caused by contact contamination or surface breakdown.
It is forbidden to check the ignition by successive disconnection of high-voltage wires.
1. If the start fails, first of all check the battery voltage when the starter is turned on by disconnecting and connecting the high-voltage wire of the coil to ground. If the voltage is less than 9.5 V, then check the battery and charging system.
2. At normal starter speeds, connect a stroboscope and determine the presence of voltage on the candles. If strobe flashes are observed, then it is necessary to check the candles. Otherwise, check the condition of the wires, distributor cap, coal and slider.
3. If there is a spark, then check the carburetor.
4. If there is no spark, check the voltage at the output "+" coils (11.7 V). If the voltage is less than 11 V, then check the entire power circuit, including the fuse and ground connections.
5. If the voltage is normal, then check the ignition coil (winding resistance, reliability of contacts, especially low-voltage).
6. If the coil is good, then the electronic switch is faulty (checked and repaired in a car service).
7. Check thermal vacuum valve. Disconnect the damping valve and blow through - air should flow freely from the side of the distributor.
8. If the engine runs intermittently, check the low voltage and high voltage circuits.
9. Check the reliability of the contacts and the resistance of the primary circuit.
10. Check the condition of the distributor cap, spark plugs (by interchanging them), runner and coal.
11. Use a strobe light to check for voltage at all spark plugs and wires.
12. If there is no voltage on part of the wires, check the wires or the distributor cap.
13. In the complete absence of high voltage, check the ignition coil.
Carburetor engines with catalytic converter and injection engines
1. If the ignition system fails, check the condition of the air filter, spark plugs, throttle cable adjustment, compression and valve clearances.
2. Checking the ignition system of these engines comes down to determining the advance angle, checking the reliability of the connectors on the control unit and fastening the wires.
3. On injection engines, use the self-diagnostic mode.
4. If no malfunction is found, then the car should be handed over to a car service.