My 04 sierra w/5.3
 

I NEED SOME HELP. I DONT KNOW WHAT IT IS , BUT WHEN I CRANK UP EARLY IN THE MORNING I GET A RATTLING NOISE FROM THE EXHAUST. COULD THAT BE THE CONVERTERS ? IF SO WHAT DO YOU SUGGEST. IT ALSO MAKES THIS NOISE WHEN I REV IT UP AND THEN GET OFF OF IT. CANT AFFORD CONVERTERS.:mad:

Check to see if your bolts backed out that connect your intermediate pipe to your Y-pipe. That is what happened to mine when it started to rattle. When I installed my catback system on my truck I apparently did not tighten up teh bolts tight enough. They were like .89 cents a piece for them at the dealership.

What does it accually sound like when they bebin to go out?

What does it accually sound like when they are going out?

If the converters are no good they will actually clog up and restrict exhaust. Have you gotten under there and looked?

my luck
 

I went to the local muffler shop and the mechanic checked my converter and it was indeed rattling . Next he checked my mileage and when i bought the truck and come to find out 8 year or 80,000 miles my vehicle is covered by federal law and the gm dealership fixed it for free . Soi got brand new converters and shiny new pipe from the manifolds to the mufflers.