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turbo surge then lull (no boost?)

1K views 2 replies 2 participants last post by  call900 
#1 ·
New to tdi's I have no experience with turbo diesels. My car builds boost nice and quick then softens before slowly ramping up again every time I go thru the rpm range. It has me thinking of a waste gate opening up to much bleeding off to much boost. The car is an auto if that matters. :confused:
 
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