Hey,
The turbo works on pressure not vacuum so that wouldn't be an issue.
check these links here to test your turbo unit:

http://business.baylor.edu/Richard_Easley//autofaqs/wgate.htm
http://business.baylor.edu/Richard_Easley//autofaqs/boostchk.htm

A search on KKK and Garret will also provide a wealth of information.

Danny

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1984 300SD Turbo Diesel 150,000 miles

OBK member #23

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