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BMW engine stalls at start, stalls and depresses accelerator pedal to maintain idle speed

01-11
A BMW sedan with E39 chassis and M54 engine. When the engine is in gear, it often stalls. When the engine stops, restart it, and you need to press the accelerator pedal to maintain idle speed.


Diagnosis process:
The vehicle accelerates at a standstill, and its performance is basically normal. In this case, the failure has nothing to do with the fuel supply system. According to this failure performance, it has a lot to do with the air intake system, because the idle speed is too low is usually related to the malfunction of the idle solenoid valve. You can use the diagnostic instrument to test the idle speed solenoid valve to determine its performance. A simple method of shaking the idle solenoid valve can also be used to check whether the spool is flexible.
01Remove the housing of the air cleaner and remove the idle solenoid valve under the intake manifold to check that there is a lot of oil in the working chamber and the valve core is stuck.
02Clean the idling solenoid valve and electronic throttle.
03 After the assembly is complete, start the engine and the fault disappears.


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