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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > (HELP) installed jb4, car wont start (HELP)



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      09-12-2019, 10:59 PM   #1
Acoop
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(HELP) installed jb4, car wont start (HELP)

Hi. I just installed a jb4 into my 2008 335xi and everything worked, Bluetooth connected and I could adjust settings. But everytime I attempt to start the car, it just cranks and doesn't turn over. I bought the jb4 used. Any help would be great. Thanks.

Also thought to add that sometimes there is a loud whining in the front of the car. The car was working perfectly before this (around 3 hours ago).
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      09-13-2019, 06:04 AM   #2
Rob09msport
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Quote:
Originally Posted by Acoop View Post
Hi. I just installed a jb4 into my 2008 335xi and everything worked, Bluetooth connected and I could adjust settings. But everytime I attempt to start the car, it just cranks and doesn't turn over. I bought the jb4 used. Any help would be great. Thanks.

Also thought to add that sometimes there is a loud whining in the front of the car. The car was working perfectly before this (around 3 hours ago).
Set jb4 to map 0 then try. If that doesnt work check harness connections if they are good remove it.
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      09-13-2019, 11:38 AM   #3
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Originally Posted by Rob09msport View Post
Set jb4 to map 0 then try. If that doesnt work check harness connections if they are good remove it.
I set it to map 0, still just cranks and doesn't start. All my connections seem good too. I am getting 12.1 volts through the entire jb4, no idea why its not working.
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      09-13-2019, 03:54 PM   #4
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Usually means something is plugged in backwards or not seated properly. Post photos of the install if you want help.
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