Catalytic Converter "popping"

Discussion in '100-Series Cruisers' started by DOGMARLEY, May 14, 2010.

  1. DOGMARLEY

    DOGMARLEY

    Messages:
    228
    Location:
    Atlanta, GA
    '06-lx470.

    When the truck is warmed up, you can hear the cat(s) making a light popping sound. It sounds like someone hitting a metal pan with a screw driver. Once you turn the truck off, the sound is more prominent since the engine noise is gone. Does anyone ever hear this noise? How would I know if the cat(s) is going bad? I think their is a 80k mile warranty on all cats per the emissions guidlines. Thanks for the help.
  2. Trunk Monkey

    Trunk Monkey Moderator

    Messages:
    7,559
    Location:
    Salt Lake City
  3. RedEuro

    RedEuro

    Messages:
    118
    Location:
    Seattle
    Are you sure its not just the heat shield causing the noise. I know mine popped off on the passenger side. A few minutes with the welder and it was tacked back in place...noise is gone.
  4. NMuzj100

    NMuzj100

    Messages:
    3,479
    Location:
    Gleneagle, CO
    Some expansion/contraction sounds are normal but I would inspect for something loose that is amplifiying yours.

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