Quote:
Originally Posted by backtoreality15
Well my experience with the 128i is that when cold-starting, the exhaust is much deeper, and then quiets down once the car warms up. It seems to be the opposite of what should be happening? For the record I have done the golf tee mod before and have removed it. I hope that didnt damage the actuator.
Any ideas?
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That's normal. The 135i is the exact same way. I think the flap defaults to the open position, and then closes as the vacuum builds. That's why taking the vacuum line off, or plugging it up makes the valve stay open all the time. When you first start the car it takes a second for vacuum to build up in the entire system.