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2010 2011 BMW 5 Series Forum F10 F10 Technical Topics Engine, Transmission, Exhaust, Drivetrain, ECU Software Modifications Jerk? Jb4
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      12-26-2012, 05:22 PM   #1
obiltagi3
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Car jerk? jb4

Hello everyone, i installed the jb4 stage 2 about 3 weeks now. After installation i noticed when driving casually, or normally the car jerks. It sounds like it is jerking possibly while shifting. Like i says it only happens when cruising. Not sure what is causing this. I am tempted to take off the jb4 and see if it consists. But before i do i would like to hear any input, ideas.

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      12-26-2012, 08:45 PM   #2
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I don't have stg2 but the stage one was making the shifts from first->second->third unbearable. So I took it out. After I bring the car in for service at the dealer I'll probably update the firmware on the tune and reinstall it and see if it persists. See if it stops when you take it out like mine did.
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