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Thread: Whacking, knocking noise at cold start - 2013 6.7l

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    Whacking, knocking noise at cold start - 2013 6.7l

    I started my truck today and heard a very loud whacking noise. It almost sounded like there was a ratchet on the drive belt and every time it went around it went "whack, whack, whack, whack). I heard the noise about 7 times and then on the last time it kind of sounded like something was set free.

    It was 55 degrees out, so not too cold...

    It's a 2013 RAM 2500 that just hit 43,500 miles.

    I heard the exact same noise once last week as well. Once the noise stopped, everything was fine - I put 100 miles on it and never heard it again. It had been sitting for 2 or 3 days before I started it..... I let the plugs warm up and everything before starting it...

    Thanks in advance - kind of new to Cummins - I just got the truck about 6 months ago. It has been great - the entire truck looks like brand new really...


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    Re: Whacking, knocking noise at cold start - 2013 6.7l

    PS the 7 knocks were very loud, like someone splitting wood with an axe.. Not a "ting" but more of a "whack". LOL. I'll record my next several startups just in case it occurs again.


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    WE WILL STAND! IGOTACUMMINS's Avatar

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    Re: Whacking, knocking noise at cold start - 2013 6.7l

    Get us a video.

    "The grass is greener where you water it"


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    Re: Whacking, knocking noise at cold start - 2013 6.7l

    Quote Originally Posted by LenNC View Post
    I started my truck today and heard a very loud whacking noise. It almost sounded like there was a ratchet on the drive belt and every time it went around it went "whack, whack, whack, whack). I heard the noise about 7 times and then on the last time it kind of sounded like something was set free.

    It was 55 degrees out, so not too cold...

    It's a 2013 RAM 2500 that just hit 43,500 miles.

    I heard the exact same noise once last week as well. Once the noise stopped, everything was fine - I put 100 miles on it and never heard it again. It had been sitting for 2 or 3 days before I started it..... I let the plugs warm up and everything before starting it...

    Thanks in advance - kind of new to Cummins - I just got the truck about 6 months ago. It has been great - the entire truck looks like brand new really...

    Any smoke on start up? is it stock? Tuning? Whos tunes?

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    Re: Whacking, knocking noise at cold start - 2013 6.7l

    No smoke, 100% bone stock.


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    Re: Whacking, knocking noise at cold start - 2013 6.7l

    Quote Originally Posted by LenNC View Post
    No smoke, 100% bone stock.

    That video will be extremely helpful before we decide to start throwing out random ideas. I hope it doesnt do it again but i hope it does so we can all chime in and help ya out.

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    Re: Whacking, knocking noise at cold start - 2013 6.7l

    Will do. I will follow up as soon as possible. Thanks!


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    Basic Member Gregory Aradjan's Avatar

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    Re: Whacking, knocking noise at cold start - 2013 6.7l

    Any update on this. I think I experienced the same issue today.


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    Re: Whacking, knocking noise at cold start - 2013 6.7l

    Quote Originally Posted by Gregory Aradjan View Post
    Any update on this. I think I experienced the same issue today.
    Welcome Gregory!


    2016 Ram Laramie 3500 (DRD), G56, 6.7, Rough Country Leveling, HID headlights, Morimoto LED fogs plus a whole lot more!

    2016 RAM 3500 4x4 Laramie Crew Cab
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    Basic Member Gregory Aradjan's Avatar

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    Re: Whacking, knocking noise at cold start - 2013 6.7l

    Thank you


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