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Hi Kaefer,
17a (which hose 16 connects to) looks like an altitude compensating device to me. I would try to locate 17a and see if the hose is plugged or not. It may also be that the WUR (#54) has been replaced on your car and the original did not have it.
ianc
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BMW 135i. Nice. Fast. But no 911...
"I will tell you there is a big difference between driving money and driving blood, sweat and tears." - PorscheGuy79
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