My fiances 06 grand prix just started a new noise today. When turning left, either stopped or moving, not every time but often it will make a "pop" noise coming from behind the wheel. I already made sure it wasnt the strut mounts and i cant quite pinpoint the source. So I was wondering if any of you have had this issue and know what it may be? Maybe a common problem on these? I just had it on a hoist yesterday and everything is tight (inner/outers, wheel bearings, balljoints, lca bushings) so what the heck? What might this be?