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      09-23-2019, 01:53 PM   #4
Our03z4
First Lieutenant
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Drives: 2008 BMW Z4 3.0si Coupe
Join Date: Nov 2016
Location: USA

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Could be a bad low end vanos solenoid. I have the same car and it has many odd quirks that no one can figure out. Try the British forum, have a nice long thread of engine issues with our cars that people are narrowing down.