Want to trouble shoot and repair my 4x4 (o2 Excursion)not engaging. Had Ford replace a valve last year and it's happened again. Can engage front drive by manually turning the hubs but cannot engage with switch. Think it's vacume problem, but know nothing about the system. Can you guide me as to what to look for.
Thank you.
Thank you.
May 8, 2011 at 4:35 PM