Do I need to replace my cam phasers?
I have a 2003 Lincoln Navigator with the 5.4 DOHC engine.
After about 180K miles it has developed a rod know so I am hiving the engine rebuilt. One machine shop tells me that the Cam phasers always need to be replaced on the 5.4 DOHCs. Another shop tells me that only the 3V 5.4s have the problem, so they do not replace them.
Who should I believe?