Quote:
Originally Posted by Infuzion
Awesome I'll have to try that! Hopefully it's nothing too serious, but in terms of the air/fuel ratio, shouldn't the computer figure that out rather quickly when the car is started? Or could the possible intake gasket failure be causing serious issues with it?
Thanks again for your replies and it does mean a lot!  |
The computer can figure it out when it gets the correct information. The check engine light and diagnostic trouble codes help when the sensors are providing information the is "out of range". Being able to look at codes and live data help the technician locate the real problem. They can also utilize the BMW data base of known problems for the vehicle and codes stored.
Your random misfire on all cylinders will create O2 sensor readings that are not in range. The exhaust O2 readings are used to trim the fuel mixture.
The pressure sensor code could be the hint that will lead to finding the problem. But again being able to monitor the fuel pressure data with the engine running to see if it is within normal amounts helps with the diagnosis.
This is from the M3 Tech Info for the fuel system:
"There is now only one fuel pump (the M5 has two). This has a three-phase motor, which ensures sufficient torque across the whole pump speed range. The pump speed is used to provide the required fuel pressure of 3-6 bar, depending on the engine operating state.
A fuel pressure sensor sends its signal to the MSS60. The fuel pressure sensor is located behind the inner fenderwell. If the pressure sensor fails or there is a fault in the CAN bus and in the engine emergency program, the fuel pump is operated at full speed. In this process, the pressure is limited to 6 bar by the mechanical pressure sensor.
The signals from both tank fill level sensors are sent to the junction box and are forwarded to the instrument cluster via the K-CAN, where they are evaluated and displayed."