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knocking sounds are scary

Discussion in 'GM Powertrain' started by tcook18, Jan 26, 2010.

  1. tcook18

    tcook18 New Member

    today when i parked my truck i heard this knocking sound and automatically popped the hood thinnking i threw a rod but the engine was sounding fine but when i reved it up alittle it sounded as if it was coming from the exhaust... not sure what it could be
  2. silveradotrailblazer

    silveradotrailblazer Epic Member 5+ Years ROTM Winner 5000 Posts

    Could be the cat. When it cools hit it with your hand and see if it rattles.

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