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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > Jb4 help!



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      09-07-2015, 01:41 PM   #1
xcxxr335
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Jb4 help!

Recently installed jb4. Ive noticed after doing a few hard pulls in M mode after i shift up to 6th and just cruise the car doesnt move. I hear the engine sucking in air but the car takes a while to get over 2000rpm. Also in D mode when in 6th and M mode the engine pulses while sucking in the air. I checked my intake everything is sealed and also checked for any leaks and nothing. Anyone else experience that or have any insight as to what might be the problem? Its a 2011 n55 AT w/ alpina flash. Thanks in advance guys!
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      09-07-2015, 01:47 PM   #2
Chocolatethunder
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[quote=xcxxr335;18542405]Recently installed jb4. Ive noticed after doing a few hard pulls in M mode after i shift up to 6th and just cruise the car doesnt move. I hear the engine sucking in air but the car takes a while to get over 2000rpm. Also in D mode when in 6th and M mode the engine pulses while sucking in the air. I checked my intake everything is sealed and also checked for any leaks and nothing. Anyone else experience that or have any insight as to what might be the problem? Its a 2011 n55 AT w/ alpina flash. Thanks in advance guys![/QUOTE

Do you have usb to check for codes?
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      09-07-2015, 02:02 PM   #3
xcxxr335
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No I've ordered one and waiting on it to come in. But ive been checking th codes though the jb4 im just getting a exhaust flap code, and bov/dv jammed shut. Both common codes ive read nothing to worry about there.
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      09-07-2015, 02:03 PM   #4
xcxxr335
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In D mode the car will suck in air and stop and suck in air and stop untill i get higher in the rpm range. It pulses and pulls slowly. But in M mode espcially the car is sucking air but taking long to get out of the 2000rpm range
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