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Are these operated by electric motors or hydraulics? The GF's 08 535xiT operated by hydraulics and completely had a mind of it own...sometimes it'd open, sometimes it'd close, sometimes it'd open 3/4 the way and make me open the rest manually, sometimes it wouldn't close unless I pushed it downwards and 1/4 of the way and then hitting the button would allow it to close the rest of the way on its own.
The solution was to top off and bleed the hydraulics system. Even though I saw no leakage in the hatch area, it was down on fluid...not enough fluid caused it to suck in air bubbles, hence ALL of it's erratic operations. Haven't had a single problem since with it.
If it's electronic, then I'm at a loss...sorry and hopefully you guys figure it out. Maybe reset the iDrive and/or adjust open/close distance settings to see if changes will somehow cause the system to force new things to happen.
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'10 BMW X5///M - Alpine White on Sakhir Orange - JB4 w/ HCP Stage 2 BEF, NGK 97506 @ .20, SS tubing & BMC filters, gutted cats, AC Forged 312 22's, H&R 2"
'98 BMW 740iL - ///E39 M5 6spd swap, fully built engine (sleeved, P&P, cams), 3.46 LSD, H&R Stage 2/Bilstein HD, Magnaflow 14816's
'97 BMW 328ci - ///E36 M3 clutch & L/W flywheel, Z4///M 18's
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