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      09-20-2020, 01:40 AM   #6
weehe126
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Drives: 2016 340i
Join Date: Apr 2014
Location: San Antonio

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Quote:
Originally Posted by 440MIA View Post
The B58 has 3 water pumps (that I know of). One of them is mechanical and the other two are electrical pumps. One of the electrical pumps is for the charged air to water cooler intercooler in our intake plenum. The second electrical pump is for cooling the turbo. Also, if you get the turbo hot enough and turn off the car, the turbo pump will stay on to cool it down.
Nice, makes sense. Then would make sense it could be the turbo cooling pump since it's only after shutdown. The servomotor issue would occur before start up (waking the car up), and after locking the car (going to sleep).