Table of contents: Carburetor engines without a…↓ Carburetor engines with a…↓
Warning! Observe safety precautions to prevent electric shock. Turn off the ignition before connecting devices.
Carburetor engines without a neutralizer
Ignition failures are usually caused by contamination of contacts or breakdown on the surface.
It is prohibited to check the ignition by successively disconnecting the high-voltage wires.
1. If the engine fails to start, first 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, check the battery and the charging system.
2. At normal starter speed, connect the stroboscope and determine the presence of voltage on the spark plugs. If the stroboscope flashes, then the spark plugs should be checked. Otherwise, check the condition of the wires, distributor cap, carbon and runner.
3. If there is a spark, check the carburetor.
4. If there is no spark, check the voltage at the "+" terminal of the coil (11.7 V). If the voltage is below 11 V, check the entire power supply circuit, including the fuse and ground connections.
5. If the voltage is normal, then check the ignition coil (winding resistance, contact reliability, especially low-voltage).
6. If the coil is OK, then the electronic switch is faulty (checked and repaired in a car service).
7. Check the thermal vacuum valve. Disconnect the damping valve and blow it out – air should flow freely from the distributor side.
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 and spark plugs (by means of their interchangeability), runner and coal.
11. Use a stroboscope to check for voltage on all spark plugs and wires.
12. If there is no voltage on some of the wires, check the wires or the distributor cap.
13. If there is no high voltage at all, check the ignition coil.
Carburetor engines with a neutralizer and injection engines
1. If the ignition system fails, you should check the condition of the air filter, spark plugs, adjustment of the throttle cable, compression and valve clearances.
(The text was copied from the portal: nissanbook.ru)
2. Checking the ignition system of these engines comes down to determining the ignition timing angle, checking the reliability of the connectors on the control unit and the fastening of the wires.
3. On injection engines, the self-diagnostic mode should be used.
4. If no fault is found, the car should be taken to a car service center.