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      02-01-2013, 01:36 PM   #4
Mike@N54Tuning.com
BimmerPost Supporting Vendor
Canada
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Drives: 2007 335i, 2015 M3
Join Date: Dec 2008
Location: N54tuning.com

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The JB4 is off at idle and during cold starts, so its not doing anything. If there is a connection problem or bent pin that could cause some issues. Its difficult to say as you wouldn't believe the condition I see some used JB4s come back with pins missing, wires cut, etc.

Double check all connections and double check all JB4 wires are properly seated in connector, etc.

Mike
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