| Symptom | Possible cause |
| Excessive fuel consumption | The air cleaner filter element is dirty or its patency is otherwise impaired (see chapter Routine car maintenance). |
| The ignition timing angle setting is incorrect (see chapter Ignition system). | |
| The functioning of the exhaust gas toxicity reduction systems is impaired (see chapter Engine management and emission control systems). | |
| Excessively worn or damaged internal components of the fuel injection system/carburetor (see chapter Power supply system). | |
| The tire inflation pressure is insufficient or the tires are of the wrong size (see chapter Routine car maintenance). | |
| An unsuccessful driving style has been chosen, or there is an adverse impact of external factors. | |
There are fuel leaks or there is a distinct smell of gasoline If you suspect fuel leaks, stop using the vehicle immediately - leaks in the engine compartment can cause a fire! | There is a defect in the fuel supply lines or the fuel tank ventilation (see chapter Power supply system). |
| The gas tank is full. | |
| The fuel injectors/carburetor are excessively worn, or the seals of the fuel system components are damaged (see chapter Power supply system). |
The article was copied from an online resource «BMWman.ru»