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I have an 08 535xi with the dreaded 30ff and wastegate rattle on throttle overun. pressure tested intake side and didnt find leaks. I was thinking replace boost control solenoid for affected turbo, or trying to pull vacuum manually with mightyvac.
either way, if its a wastegate actuator issue, can i reach from the top by removing coolant reservoir wiring harnass etc? or do i have to pull subframe to do any work on turbos?
also, does the intercooler inlet pipe ever leak or is it always the charge pipe between FMIC and intake manifold that cracks and leaks? Most places sell the outlet pipe but not the inlet pipe.
thanks!!
 
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