coolblue

So I've been noticing that at low speed (ex. Pulling through a drive thru at a fast food place) I can hear some sort of loud rattling coming from the engine. Any suggestions? Could it be cam phasers? Also how are can phaser issues diagnosed at dealerships? I have a powertrain warranty for about 4k more miles so if anything is wrong, id like to find it now.

s_vares

may just be the phasers adjusting for low rmp throttle tip in.
Its a normal sound if its not really loud.

ScottyBoston

I had a similar issue with my truck. It would only happen at a certain RPM, which was also dependent on engine temp. After some investigating I found that the intake hose was loose. It sits with a rubber mount on the driver's side part of the engine. The mount had come lose, and the hard plastic intake hose would rattle against the engine bay. I was able to re-secure it, and haven't heard the noise since!

Hope that helps!

sprint200

my 07 4.2 rattles from the catalytic converter. its only when cold and/or low rpms.