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      10-07-2010, 10:25 PM   #1
Notti Bimmer
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Drives: E90 JB 330i
Join Date: Aug 2010
Location: Seattle

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Angry Why is My Exhaust Butterfly Valve Permanently Open! BMW E90

I checked my exhaust valve several different times, when the car was off, cold idle, warm idle, etc.. it is always open. Anyone know what I can do to find out what the problem could be?

Also, how is the butterfly valve suppose to act? Is it suppose to be closed until 2500 rpm? Closed until 50% throttle? Anyone know?

I know people like doing the golf tee mod, but I just like everything on my car to function like BMW made it to. So closing and opening at the correct times would be just fine with me

Thanks guys, much appreciate any help with this...