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2004 Jeep Grand Cherokee Question: high pitched whining noise

 

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zztips, 4.0L 6 Cylinder, Niagara Falls, NY, October 28, 2013, 19:06
 Rookie

this noise comes and goes depending on throttle pressure under heavy load and acceleration it goes away, But under coast or light throttle it has an annoying high pitched whine hard to tell if transmission or rear end

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  • Answer #1

    Greg's Orange Auto (13230 Answers) , Orange, CA - (714) 361-9386
    globalhelper October 29, 2013, 06:34
     Master

    ck for vac leak at intake manifold

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    zztips, October 30, 2013, 14:55
     Rookie

    thing is the 6 cyl engine runs smooth I do not hear a leak when it is just idling and to hear one at 100 klm it would have to be really bad I would think. At a 100klms if I let off on the gas and then apply just a little the whine comes back depending on throttle pressure.

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  • Answer #2

    ziptie12 October 30, 2013, 14:16
     Master

    What about coasting in neutral at 45-50 mph? Rule in/out drive train.

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    zztips, October 30, 2013, 14:50
     Rookie

    when I do that it is silent

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    ziptie12, October 30, 2013, 20:14
     Master

    Have rear diff. checked/serviced first , then trans. Is it all-wheel drive?

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    zztips, October 30, 2013, 20:24
     Rookie

    yes all wheel drive

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