Quote:
Originally Posted by maxwmiller
Vacuum pump. Leaking fluid fills the reservoir attached to plastic engine cover, causing improper operation of turbocharger (for models with pneumatic waste gate).
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This is a little but known issue with older X1 with the above wastegate type. Later year X1 have EWG which is better and take on tuning well. However BMW for some strange reason kept the tube routing useless PWG tube terminating into engine cover chamber that does nothing.