Complaint: drive characteristic faults, lack of power
WARNING: This page is about a different car, the 2002 BMW M Roadster, 2002 BMW M Coupe, 2001 BMW M Roadster, and 2001 BMW M Coupe. However, it is still accessible from the selected car via links, so may be relevant.
- Run engine at idle speed and measure fuel pressure.
- In order to simulate "full load" state:
Disconnect vacuum hose from fuel pressure regulator and measure fuel pressure.
- The measured value must increase by 0.4 to 0.7 bar depending on the engine. Note down measured value.
- If the measured value does not increase:
Replace vacuum hose and measure fuel pressure again
- If the measured value still does not increase:
Replace pressure regulator
- If the measured value does not increase:
- Measure fuel pressure again and note down measured value.
- Compare the measured value with the nominal value stamped in the pressure regulator housing.
If the specified measured value is still not achieved, you must carry out the following checks depending on the measured value.