Did a search but may have missed a good answer.
So 2009 I4 SR5 w/ 76,000 miles. I have had an obnoxious engine squeak for I don't know how long. Landlord is a mechanic and it drives him nuts. It seems to really squeal around 2500 rpm, which is where I do most of my cruising. So I popped the hood and shot some WD40 in 3 places that all appeared to be idlers. The sound def changed for a while. Higher pitched!
Anybody have a belt diagram for the 2.7? How would I check the belt tension? How hard is it to replace a pulley? Should I consider replacing the Serpentine just for shits and giggles? Any other suggestions?