New Engine Noise

[spark763]

2013 sedan with 3.8. 23000 miles, when accelerating I hear what sounds like an exhaust leak or air leak. Anyone have an idea what could be causing this. I checked everything and everything is tight. Going to dealer next week to have it checked.
Thanks

 

[Gunkk]

My guess:
A loud hiss on acceleration (absent engine performance issues ala vacuum leak) is probably a gasket failure or hole somewhere in the exhaust.

 

[fiveoh]

GDI pump.

 

[Gunkk]

If you want to sleuth it out, get a vacuum cleaner hose. Hold one end to your ear and use the other end to probe around the engine/exhaust for your hiss.

 

[FIAT]

Did you ever find out what was causing the noise?
I have a 2012 4.6 and have a loud hiss noise under load like a exhaust cover is missing.

 

[spark763]

Been in once, they think its the timing belt, needs adjusting. Going in next week to take the engine down further. Will update...

 

[videopho]

Timing belt?
You mean timing chain?

 

[landtuna]

I can't imagine a timing chain making a hissing sound unless perhaps it is the sound of a idler bearing going bad.