Can a mva cause a stroke?

Possible : Especially in older folks, trauma to large arteries in neck can be damaged by acceleration forces, with intimal dissection local clotting and stroke. Of course, if you hit steering wheel with chest, heart injury with secondary stroke could occur. Direct head trauma could cause internal brain hemorrhage, especially subdural and epidural hematomas, a different type of stroke.

Yes, indirectly: Uncommonly, the force of deceleration may tear the lining of an artery that supplies blood to the brain, called "dissection". When this happens, it can narrow or occlude the lumen of the artery limiting flow to the brain which can lead to stroke.