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Clunk on acceleration from zero load on highway

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  • TC.Barky
    Valued Member
    • Oct 2011
    • 3573
    • Melbourne
    #1

    Clunk on acceleration from zero load on highway

    Cars been doing this since new, but seems to be getting slightly more noticeable. Coasting with no throttle at highway speeds if I depress the accelerator (does it with minimal input) I get a bit of a thunk/clunk noise and a mild jolt from the drivetrain. Twice (over 35,000kms) when re-engaging the cruise control (which does a bit of a jab of heavy throttle) I have had a large/loud bang and the whole car jolts.

    Any thoughts on cause? Normal behaviour?
    MY14 NW GLX-R 3.2L Auto Build Thread
    Fitted: 265/70R17 Kanati Mud Hogs. Ultimate Suspension HD Front EHD + bags rear. MM Towbar. OL Bullbar. SPV EGR Mod. Bushskinz Bash Plates x4. Roleys Rear Bar Protector. Icom IC-400Pro. Rhino Pioneer Tradie Rack. CTEK CTD250S w/ Dual Bats. Airtec Snorkel. Scangauge II. Blackvue Dash Cam. TC mod. Autosafe Half Barrier. Masten TPMS. Drifta Custom Drawers w/ Mounted Compressor. 47L ARB Fridge. Domin8rX Winch. Towing an MDC stepthrough.
    Tags: None
  • Alexhaynes
    Member
    • May 2015
    • 58
    • Perth
    #2
    Following...my paj is doing the same thing. I still haven't been able to pin point the fault.
    11/2013 NW Pajero: OL bull bar, Hella LED fog lights, LED indicator and park lights, HR tow bar, Dobinson coils, TX3500 GME UHF radio, 9500lb ironman winch, Lightforce blitz 240 HID spotlights, Vision X trainspotter 18 LED spotlights, Shuroo, Bridgestone Duller AT LT, MX-Ultragauge, Airtec snorkel, EGR resister mod 3.6k ohm, bushskinz guards, 55watt HID 6000k low beam, double din facia kit, Kenwood DNN9150BT double din stereo, LED interior lighting, 2x blacktip 5 LED reverse lights.

    Comment

    • Wingrider
      Junior Member
      • Oct 2014
      • 32
      • Katanning
      #3
      my dealer said....

      same here...I noticed the same problem maybe after 15000kms I would say, and still going strong. Not there all the time but when it does happen it keeps on going till I accelerate off that clunking speed. Mine happens around 60kph when I am coasting and just keeping up with the traffic ahead.

      Mentioned this to my dealer last month along with my 60000k service and all he could blame was the raised suspension. Well its just the usual 50mm billy-lovy combo installed by opposite lock. I tried pointing that the suspension was only raised about 10000kms ago and the problem has been there before. but he was stuck hard on my suspension.

      I seem to remember reading something about engine mounts here sometime ago with similar clunking but not sure if it was for this coasting clunk or something else. Certainly so far I haven't noticed any performance problems on or offroad. Hope its just a generic inherent problem with the NW without any consequences.
      2013 VRX auto Diesel, MM alloy bullbar, Halo Dominator 21 inch LED bar, Boos bash plates, Billies and lovells 2inch HD, more to come soon...

      Comment

      • RodZone
        Member
        • Nov 2015
        • 95
        • Gippsland Lakes
        #4
        Mechanic told me yesterday that the drive shaft splines in mine are bit worn producing this bump as drive takes up on acceleration after coasting.

        I'm wondering if there are reconditioned units to be had or some repair.

        He thinks it is from a lot of towing but can be caused by lifts esp. if not done right.
        2000 NM V6 Exceed auto

        Comment

        • G Potter
          Member
          • Apr 2012
          • 177
          • Colac
          #5
          I have had the engine mounts replaced on warranty on my NW. Done at about 50k, was noticing the clunk sound etc. I don't get my car serviced at a MM dealer but the new MM dealer in Geelong was excellent in this matter as well as the timing chain recall. Even gave me a a case for the day at no charge.
          Cheers
          Greg

          Comment

          • Ian Johnston
            Valued Member
            • Feb 2010
            • 759
            • Mount Gambier, SA
            #6
            Is the drive shaft nut coming loose problem still around on the later models??
            Maybe worth a look.
            2015 Subaru Forester 2.5 petrol CVT. (Missus car)
            Just got an NS DID manual (my car) SOLD.
            2014 Subaru Outback diesel, CVT. Mine

            Comment

            • conquistador
              Valued Member
              • Feb 2012
              • 807
              • sth east queensland
              #7
              Originally posted by TC.Barky View Post
              Cars been doing this since new, but seems to be getting slightly more noticeable. Coasting with no throttle at highway speeds if I depress the accelerator (does it with minimal input) I get a bit of a thunk/clunk noise and a mild jolt from the drivetrain. Twice (over 35,000kms) when re-engaging the cruise control (which does a bit of a jab of heavy throttle) I have had a large/loud bang and the whole car jolts.

              Any thoughts on cause? Normal behaviour?
              Try it in 4wd see if it does it then. Mine did jolt in 2wd on account of the rear diff bushes being due. Putting it in 4wd settles it down somewhat. Having said that the cruise increments aren't subtle

              Comment

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