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Loud 9900i

Discussion in 'Trucks [ Eighteen Wheelers ]' started by tricountygrain, Nov 4, 2014.

  1. Nov 4, 2014 #1
    tricountygrain

    tricountygrain Bobtail Member

    2
    0
    Nov 3, 2014
    0
    Hello
    In the past year I've purchased a 2006 9400i eagle with a 72 inch pro sleeper and a Cummins ISX @475 HP. The truck runs great and the only cab noise is the turbo spooling up. Last week I picked up a 2003 9900i day cab. With the same engine as the 06 9400i. The cab noise is awful. From the outside both trucks sound the same all the way from low idle to full throttle. Had both in the shop and inspected the fire wall padding. Everything is exactly the same. I don't even want to drive this truck anymore. We currently have 8 trucks with Detroits, M11s, and a Cat 3406B. Has anyone else had this problem?
     
    tricountygrain, Nov 4, 2014
    tricountygrain, Nov 4, 2014
    #1
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  3. Nov 5, 2014 #2
    Thed302

    Thed302 Light Load Member

    114
    70
    Oct 30, 2014
    USA
    0
    Check for exhaust leaks.
     
    Thed302, Nov 5, 2014
    Thed302, Nov 5, 2014
    #2
  4. Nov 8, 2014 #3
    tw1005tx

    tw1005tx Light Load Member

    60
    18
    Feb 24, 2011
    0
    We have both sleeper cabs and day cabs all the day cabs are louder, some of them have a lot of droning noise some times I use ear plugs, if you like straight strait pipes get a day cab it may sound good for awhile but it will get old.
     
    tw1005tx, Nov 8, 2014
    tw1005tx, Nov 8, 2014
    #3
  5. Nov 9, 2014 #4
    Heavyd

    Heavyd Road Train Member

    7,824
    6,273
    Feb 4, 2009
    0
    Does the day cab have solid cab ride, or cab air ride? Check the condition of the hood insulation on the underside of the hood.
     
    Heavyd, Nov 9, 2014
    Heavyd, Nov 9, 2014
    #4
    The Challenger Thanks this.
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