Single point injection system
malfunction | Its reason | Troubleshooting |
| A. A cold engine either starts poorly or does not start at all. | 1. The electrical relay is faulty. 2. The speed sensor is faulty. 3. The fuel pump does not work or does not work at full capacity. 4. The fuel pressure regulator is faulty. 5. The coolant temperature sensor or, respectively, the intake manifold temperature sensor is faulty. 6. The throttle potentiometer is faulty. 7. The control device is faulty. 8. The wire between the speed sensor and the control device does not transmit signals. 9. Air sucked into the engine through leaks. | Check and replace if necessary. Check and replace if necessary. Is there gas in the tank? Check the fuel pump, measure the amount of fuel being pumped, measure the pressure. Check the temperature sensor. Check at a car repair shop. Check at a car repair shop. Check the entire length of the wire. Check all hose connections. |
| Q. The warm engine does not start or starts poorly. | 1. See A. 1-9. 2. The pressure sensor is faulty. 3. The nozzle is leaking. | Check at a car repair shop. Check the injector. |
| C. The engine starts but then stalls again. | 1. The throttle position controller does not work. 2. See A. 6. 3. The lambda probe is faulty. | Check the throttle position controller. Check for proper functionality, replace if necessary. |
| D. Cold engine vibrates at idle. | 1. See A. 5. 2. See C. 1. | |
| E. The warm engine vibrates at idle. | See C. 1. | |
| F. Engine idle speed decreases when a powerful power consumer is connected or when the power steering is turned fully. | See C. 1. | |
| G. The engine runs intermittently. | 1. The fuel filter is clogged. 2. See A. 3. 3. See B. 2. 4. See C. 3. | Replace the filter. |
| H. Unstable operation at 2000-3000 rpm. | See A. 6. | |
| I. The engine runs intermittently or stops. | See A. 3. | |
| J. The engine develops insufficient power. | 1. See A. 3, 6 and 9. 2. The throttle valve does not open fully. 3. The full load switch is faulty or improperly adjusted. | Adjust the throttle cable installation. Adjust or replace the switch. |
| K. The motor shoots into the suction pipe. | 1. See A. 4. 2. See C. 3. |