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Thread: 2018 Cummins 6.7L - S400 Making Whining Noise - HELP!

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    2018 Cummins 6.7L - S400 Making Whining Noise - HELP!

    I have 195k on it.

    Put the kit on at 182k haven't had 1 issue.

    And I am running DRD tuning on an MM3 controller.

    4-inch downpipe and S400 kit and tune, and that are pretty much it. And ARP head studs and exhaust manifold bolts

    When I get on load, it is randomly making a whining noise.

    Could this be the tranny on the way out or a boost leak from the Intercooler pipe to the intake manifold pipe?

    Those are stock clamps and hoses

    20210411_174823.jpg

    20210411_174830.jpg


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    MOD watersupply189's Avatar

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    Re: 2018 Cummins 6.7L - S400 Making Whining Noise - HELP!

    Have you checked your delete plates to make sure they are tight and sealing good?


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    2016 RAM 3500 4x4 Laramie Crew Cab ,G56

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  5. Top Of Page | #3

    Re: 2018 Cummins 6.7L - S400 Making Whining Noise - HELP!

    Also, check if you still have the stock intercooler and a boost leak or a crack in it.

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    Re: 2018 Cummins 6.7L - S400 Making Whining Noise - HELP!

    No I am doing that this morning. I am starting to think it is a exhaust leak


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  9. Top Of Page | #5

    Re: 2018 Cummins 6.7L - S400 Making Whining Noise - HELP!

    I have stock intercooler.

    I'm checking all this today.


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  11. Top Of Page | #6

    Re: 2018 Cummins 6.7L - S400 Making Whining Noise - HELP!

    I have seen the back EGR plate come loose and start to whistle.

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    I WILL STAND! AK Bob's Avatar

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    2018 Cummins 6.7L - S400 Making Whining Noise - HELP!

    Quote Originally Posted by 2018cummings View Post
    No I am doing that this morning. I am starting to think it is a exhaust leak
    Easy way to check for exhaust leaks!




    2014 RAM 3500 (Aisin) 3.73 4X4 Limited Crew Cab Long Bed DRW. Oil Bypass Filter, Fuel Filtration Kit and 50 Gallon auxiliary fuel tank.

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    2014 RAM 3500 (Aisin) 3.73 4X4 Limited Crew Cab Long Bed DRW. Oil Bypass Filter, Fuel Filtration Kit, Cold Air Intake, City Diesel Actuator and 50 Gallon Aux Fuel Tank.

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  15. Top Of Page | #8

    Re: 2018 Cummins 6.7L - S400 Making Whining Noise - HELP!

    It was my exhaust manifold.

    On the 6th cylinder the bolts onto the stud fell off.

    All being fixed as we speak and a fleece exhaust brake being installed.


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