2001 Silverado Exhaust Rattle

Discussion in 'Trucks and Trailers' started by blythefieldacreslawncare, Feb 24, 2014.

  1. blythefieldacreslawncare

    blythefieldacreslawncare LawnSite Member
    Posts: 94

    I recently bought a 2001 Silverado 6.0 liter 2500 with 130k miles. I noticed that i hear a rattle when it reaches 1500 rpms. It never rattles at any other rpms. I already removed the manifold covers because they were rusted but i still hear it. I checked the exhaust from front to back and can not find anything that will rattle but yet it continues to rattle at 1500 rpm. Any body have an idea to what this could be?
     
  2. Valk

    Valk LawnSite Silver Member
    Posts: 2,711

    I've generally found these annoying rattles to either be an adjustable flange/bracket or w/in one of the heat-shield cages around the cat/etc... Sometimes rocks will get thrown up in there, too.
    .02
     
  3. Patriot Services

    Patriot Services LawnSite Fanatic
    Posts: 12,450

    Check your fan clutch.
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  4. blythefieldacreslawncare

    blythefieldacreslawncare LawnSite Member
    Posts: 94

    And what might I be looking for when checking the fan clutch
     
  5. Patriot Services

    Patriot Services LawnSite Fanatic
    Posts: 12,450

    Looseness laterally. Some use a viscous fluid that may have leaked out. Have you stuck your head under the hood with the engine at 1500? Check your u joints and fan shroud too.
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  6. blythefieldacreslawncare

    blythefieldacreslawncare LawnSite Member
    Posts: 94

    Well the thing is, I never hear the noise unless its in drive or reverse. I Just bought this truck and the guy told me it was an exhaust rattle but he might have been wrong..
     
  7. Patriot Services

    Patriot Services LawnSite Fanatic
    Posts: 12,450

    If you can't shake it by hand to reproduce its probably not in the exhaust.
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  8. blythefieldacreslawncare

    blythefieldacreslawncare LawnSite Member
    Posts: 94

    I checked the Fan Clutch and U-Joints.. They were good. Then I decided to shake the exhaust again. I hit one of the cats and it made the same rattling sound I was hearing. Now what to do about it is the next question.. Is it a big deal to cut off both cats and put in a replacement pipe?
     
  9. whiffyspark

    whiffyspark LawnSite Fanatic
    Posts: 6,090

    Exhaust shield. There's a bunch. Use a rubber mallet to find it
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  10. whiffyspark

    whiffyspark LawnSite Fanatic
    Posts: 6,090

    U joints can't be visually inspected. You probably need cats to pass emissions
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