Knocking noise need help

Discussion in 'Chevy Silverado Forum (GMC Sierra)' started by 96BlackSilverado, Jan 11, 2010.

  1. 96BlackSilverado

    96BlackSilverado New Member

    I have a 96 silverado with the 5.7 When I start it up it has a knocking sound that is fairly loud coming from the motor. The oil level is good. The check engine light is on due to an o2 sensor would this have anything to do with it? What could it be?
  2. unplugged

    unplugged Epic Member 5+ Years 1000 Posts

    Does the knock go away after it warms up?
  3. 96BlackSilverado

    96BlackSilverado New Member

    yes it does
  4. topgun542

    topgun542 New Member

    im guessing its the piston slap problem

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