Funny noise coming from ?

Bird chaser wrote:
That sound is typical of a cat guts that has come apart.

X2

The sound seems to be coming from inside, there isn't a heat shield around the piece I'm talking about, it's before the muffler. I just went out and looked around again, the generator pipe comes out next to the tailpipe and did have a little play in it and a little rattle when I moved it, I will see if that is it tomorrow in the light. I hope it's that easy so I can continue vacationing in peace!

That sound is typical of a cat guts that has come apart.

Check the heat shields around the convertor. Usually the shields are spot welded. Crack a weld and it will make a racket.

Thanks I'll check the exhaust again, when I did check with the engine running it seemed to be coming from a small muffler type behind the main muffler, maybe the catalytic converter. That was where the sound was the loudest. I did check near the manifold and everything seemed fine there. It's hard to pinpoint where exactly it's coming from. Could the sound be echoing from elsewhere? Could there be something inside the catalytic converter making noise?

Check your exhaust system again.

I had an 07 HR 8.1 and the exhaust pipe had flexible connections just behind the engine and before the muffler. More like a ball/slip type joint. The tailpipe would move easy enough in this joint it allowed the end of the tailpipe to tap/bang against the coach body in sync with the engine RPM's. The tapping/banging made the joint rattle in sync with the others. This joint is designed to slip, even though it seemed odd to me.

From the factory the exhaust tips had about 1/2" clearance from the coach body where they exit. They rattled/banged every time I started it. You could see it by standing next to them when the engine started.

I had the tips of the tail pipe cut off and new ones installed angled lower with around 1-1/2" clearance... problem gone!

My guess is a typical warped or cracked exhaust manifold. You usually don't hear the noise unless it is under load. It can sound like a knocking sound.