My 04 sierra w/5.3

[youngman36]

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.

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[timber74wolf]

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.

[youngman36]

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

[youngman36]

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

[RUFFNECK4LYFE]

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

[youngman36]

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.