hey guys, i have a 2004 f150 with 5.4L and it rattles when i starts it. its sounds like its coming from the fan but nothing is loose. I read in another thread that it could be the cam phasers. if it is, is there anything to worry about breaking or is it just annoying? thanks

 

mine does it too sometimes. i heard it was low oil pressure to the timing chain tentioner at start up dont know of a fix. i just changed my oil and filter and it hasnt did it since

 

what type of oil did u use if that is the case.

 

i just used castrol 5w20 hasnt did it yet been bout a week. i was told one time it is caused by oil leaking back through the system through the oil filter so u have to buy motorcraft filters that have basiclly a check valve. i think that was a sales pitch but who knows.