Multi-point injection system
| malfunction | Its reason | Troubleshooting |
| A. When cold, the engine starts poorly or does not start at all. | 1. The electrical relay is faulty. 2. The fuel pump does not work or does not work at full capacity. 3. The starting fuel valve is faulty (16-valve engine). 4. The fuel pressure regulator is faulty. 5. The coolant temperature sensor or, respectively, the intake manifold temperature sensor is faulty. 6. The pressure sensor is faulty. 7. The throttle potentiometer is faulty. 8. The control device is faulty. 9. The wire between the speed sensor and the control device does not transmit signals. 10. Air sucked into the engine through leaks. | Check and replace if necessary. Is there gasoline in the tank? Check the fuel pump, measure the amount of fuel being pumped. Check the valve. Measure the pressure. Check all hose connections. |
| B. The warm engine does not start or starts poorly. | 1. Malfunction in the low pressure line to the fuel pressure regulator. 2. See A. 1-10. 3. The nozzle is leaking. | Check the pipeline. Check the injector. |
| C. The engine starts but then stalls again. | 1. The idle speed control valve is not working. 2. See A. 6 and 7. 3. See B. 1. | Check the valve. |
| D. Cold engine vibrates at idle. | 1. See A. 5. 2. See C. 1. | |
| E. The warm engine vibrates at idle. | See C. 1 and 4. | |
| F. Engine idle speed decreases when power steering is turned fully. | See C. 1. | |
| G. The engine runs intermittently. | 1. The fuel filter is clogged. 2. See A. 2 B. 6. 3. See B. 3. | Replace the filter. |
| H. Unstable operation at 2000-3000 rpm. | See A. 7. | |
| I. The engine runs intermittently or stops. | See A. 2. | |
| J. The engine develops insufficient power. | 1. See A. 2, 6, 7 and 10. 2. The throttle valve does not open fully. | Adjust the throttle cable installation. |
| K. The motor shoots into the suction pipe. | See A. 6. | |
| L. Too much fuel consumption. | See A. 5-7. |
Original of this article on the website (renaultbook)