2006 Mazda 6 i 4 Cyl 2.3L
why does my Mazda 6i go into limp mode? Goes and stays in 4th.
When cold it has very harsh gear engage. sometimes it will smooth out and be ok for a while. now it erratically shifts at highway speed. It also overcharges the electrical system. all began after I blew an engine and had a used engine installed. had my electrical system at 18+ volts.