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      07-07-2012, 05:31 PM   #8
Pete Schweaty
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Drives: 2014 750li
Join Date: Jun 2011
Location: MD

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Originally Posted by Gugs View Post
The answer is-
Your overboosting or knocking.

With the newer firmwares we have new features...

The Jb4 goes into safety mode and forces itself into map 4 until you restart the car.
look for flashing check engine lights right before it happens, 1 flash is overboost and several is knock.

This is exactly what is happening-
as its defaulting to map 4 and leaving you to OEM map/boost levels.

Put in less e85 and it will most likely help the issue.
Yup. The JB4 reverts to stock mapping as a safety feature. The stock boost for a 335is is 10psi.