Question about BMW 550
Is the check engine light on?
There must be a sensor not reading correctly.
You will likely need to have it hooked up to a scanner capable of reading the data from the various sensors to find out which one is causing the hesitation.
Mass airflow, throttle position and accelerator pedal position are the first ones I would be suspicious of. While there could be other sensors involved these affect fuel/air ratio control more than others.
Cars have become essentially computer controlled with inputs from the driver and difficult to diagnose without the proper equipment.
This situation will be very difficult to assist you without this information.
I would like to have had a more definitive answer for you.
Thank you for using FixYa.
Posted on Jan 04, 2011
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Posted on Jan 02, 2017
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