its a coin flip. 1 does and 1 doesnt. i personally think its mechanical design.
me personally i think its the cam timing tensioner bouncing causing cam timing swing by 30°+. as ive already seen this in my system logs. ive not quite figured out how its controllable or fixable.
Does it have a VVT delete? I see moving the coils as an easy way to rule that in or rule that out. Then you could move on to chasing other things. Good luck.
