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Turbo+ system diagnosis 700 1988

posted by  zrubin on  Tue Oct 30 07:10 CST 2007
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last visit: Thu Sep 20 15:45 CST 2012
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My 1988 740 Turbo wagon has the Turbo+ system. I know it worked when I bought the car (it had 186k then, now has 225k miles), I could see (and feel) a sudden increase in boost looking at the boost gauge when driving at WOT above ~4000 RPM. I very rarely drive in that condition, but at some point the system stopped working. Is there a common failure mode? There are no strange symtoms, there just isn't any extra boost kicking in. All the hardware is still in place and isn't visibly damaged. Is there a way to test the WOT switch? What else should I be checking? Thanks -

Zack
1980 245DL M46 287k
1988 745T+ M46 225k







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