Ugh, more noises

Discussion in 'Engine & Performance' started by Friedchicken, Apr 16, 2019.

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  1. Friedchicken

    Friedchicken Member

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    2011 1500 with 4.7, I'm getting a rattle when I first start it and put it in reverse or drive. Rattle sounds like exhaust or heat sheild but not 100%. Park and neutral is fine. I got under it with my homemade stethoscope, the only thing making a rattle with the noise is the cat converters. But if my cats were bad, wouldnt that set off a CEL for the o2 sensors? I put a laser thermometer in front and behind the cats, hotter after but only by like 50°. Hotter after means working right. Idk?? Maybe it's not the cats??
     
  2. Friedchicken

    Friedchicken Member

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    Heres a video
     
  3. ThunderMug95

    ThunderMug95 Senior Member Supporting Member

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    That has to an exhaust component...crawl up under it and hit it with a mallet and see if you can reproduce or feel it jostling around in the housing, obviously when its not running...Sounds really loud, id be more prone to say a heat shield, but you have to eyeball that.
     
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  4. Friedchicken

    Friedchicken Member

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    I was thinking maybe take out the o2 sensor that goes right into the cat, see if its louder...is that ok to do? It's weird the rattle goes away when it's hot. Idk
     
  5. RoadRamblerNJ

    RoadRamblerNJ Senior Member

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    In D or R, engine torques one way or the other, causing contact or misalignment of parts maybe.
    In P and N, no torquage = no noise.
    Noises stop after it warms up likely due to expansion of parts.
     
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  6. JohnnyMac

    JohnnyMac Hold my beer and watch this..... Military

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    My old 2000 Dodge used to get rocks up into the heat shields and it would rattle like that. I had to take them off to remove the rocks. Like @RoadRamblerNJ suggests, it would change depending on whether I was in gear or not and go away after everything heated up. That being said, could still be the cats. How many miles on the truck. Like you mentioned also, I would think bad cats would either throw a code or cause you to lose power/mpgs. A rubber mallet and a creeper are probably your best friends at this point.
     
  7. Friedchicken

    Friedchicken Member

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    Definently have power issues up hills. But maybe that's the 4.7 and 5 speed auto tranny? 156k on truck. I'll check the heat sheilds
     
  8. Friedchicken

    Friedchicken Member

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    Do u mean engine/tranny not aligning with eachother? Any certain parts u have in mind that I should check?
     
  9. RoadRamblerNJ

    RoadRamblerNJ Senior Member

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    Nope, just any parts. Like several others said, git yer butt under the truck and bring a big banger with you. Make like Spanky when he was bug huntin'.
     
  10. ThunderMug95

    ThunderMug95 Senior Member Supporting Member

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    Father had a ‘96 W/T Ram with the 3.9...reverse out of the driveway, drop it in drive and the next 100yds sounded just like that. We just replaced everything but the headers. It was replacement time anyways...Noise disappeared.
     

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