07 5.3 avalanche engine noise

Discussion in 'GM Powertrain' started by Dctackett10, Apr 7, 2014.

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  1. Dctackett10

    Dctackett10 New Member

    Can anyone tell me what this sounds Like to them. Is it a knock, lifters. This is killing me. Had nothing but trouble since I got this stupid truck


    It's a 2007 5.3 avalanche with 120,000 miles on it. All the fluid levels are fine with no engine light on


    I no the AFM in these trucks are awful and are a major problem. But don't they consume the oil. Mine don't. Help.


  2. dsfloyd

    dsfloyd New Member 1000 Posts 100 Posts

    I am not much help, but have you tried using a stethescope (or long screwdriver) to try and further pinpoint the noise. Not always the easiest thing to do though.
  3. RayVoy

    RayVoy Active Member 1000 Posts 100 Posts

    It's got a little burp, burp, burp to it, maybe an exhaust leak.
  4. Enkeiavalanche

    Enkeiavalanche Moderator 1000 Posts 100 Posts

    Sounds like mine at 114K No Problems...
  5. jskylark1969

    jskylark1969 New Member

    Check your exhaust manifolds they could be cracked they normally crack under the rear exhaust port.
  6. silverado002

    silverado002 New Member

    Sounded to me like an exhaust leak and some possible ticking in the top end. Almost sounds like lifter noise but not sure without being there. Also for a split second I thought I heard a slight metallic scraping sound from around the idler pulley.
  7. nsguy

    nsguy New Member

    My old ears don't work so well now, BUT, I thought I heard idler pulley noise...

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