Hi all,
1997 F150 V6. I get a rattle, sounds like it is from the bottom, passenger side of the engine, only when the engine is cold. After about
15 min or so of driving it is gone. Someone told me it might be the "heat riser valve" (hope I got that right). Others have said it is the "idler pully" and that it is normal. Should any of these two things concern me? The rattle is driving my bonkers, but like I said it's only when the engine is cold. Any advice? Also, if it is the riser valve, what's the cost and is this something a shadetree mechanic can handle?