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      02-25-2014, 08:33 PM   #8385
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Drives: 2008 335xi E90
Join Date: Jul 2010
Location: Somewhere in America

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Originally Posted by lfpontes View Post


I own a 335i E90 N54 auto here in Brazil.. It has AMS DP, K&N inbox, COBB, and AA BOV .

Everytime I change my current map with the cobb system, the car seems to be stuck in 2nd or 3rd gear for a while, and suddenly it drops to 1st after a few ft of driving and everything stays normal.
This only happens right after I switch the map, when I turn on the car. And only one time every time the map is switched.

Also, if I select Reverse before the car has dropped to 1st, there is a big CLUNK noise coming from the transmission.

Why does this happen? I cant seem to find any plausible answers on Google or any other source. Also, the car missfires a little bit in its first start in the morning.

Thanks guys!
Sounds normal for somebody with Cobb and Alpina TCU flash. I have it too and that is how it behaves. It goes away and acts fine in a few minutes.
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