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  • Whistle noise

    I have a nw 3.2 diesel. It has developed a high pitched whistle/ air noise . Only when accelerating and feathering the throttle. It can get really loud and Annoying. As that’s where the throttle sits when your cruising. Can anyone suggest what it might be. I need help

  • #2
    Hello, check gasket between EGR pipe and exhaust manifold at the exhaust manifold. Check if the fumes blows there.
    Pajero NS 3.2 '07 - EGR OFF, DPF OFF, Throttle body OFF (works only on shutdown)
    Pajero Sport 2.5 '01 - 2" suspension lift

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    • #3
      Had the same issue, my mechanic said it was the gasket too

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      • #4
        Had mechanic check it says it's all good engine looks good. But noise still there

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        • #5
          Sounds like a boost leak.

          Is it an Auto?

          Warning if you are not confident with car control or understand overheating transmissions and engines do not try the following.

          If it is automatic, put it into torque converter stall, put it in 4H, hand brake on, brakes on hard (left foot on brake), put it into drive or reverse (depends on what’s in front or behind you) and apply the throttle, but for no longer than 20 seconds. Then put it back into neutral and hold the revs at a 1000rpm to cool the trans down, before stalling for another 20 seconds. You need to have a bit of a plan on what joints to check.
          The amount you press the throttle will be how much you load the engine. You should be able to go to full throttle and it should not drive through the brakes.
          The stall speed is between 2000 and 3000rpm. This is the maximum engine speed at full throttle.
          This will build boost and with someone looking listening in the engine bay you should be able to pinpoint the problem. A spray bottle with detergent can help also.
          So if you say it makes the noise when driving normal this is about quarter throttle so only apply that to start with then gradually apply more as required.
          Scooby, Scott, Scooter, Whatever.

          Pajero 2013 NW VRX DID Auto. Basically Stock. 200k. Heavier rear springs to tow the GG’s. Automate also to tow the GG,s.

          Pajero 2002 NM GLS V6 Auto. Basically stock. 355k.

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          • #6
            Originally posted by Scooby View Post
            Sounds like a boost leak.

            Is it an Auto?

            Warning if you are not confident with car control or understand overheating transmissions and engines do not try the following.

            If it is automatic, put it into torque converter stall, put it in 4H, hand brake on, brakes on hard (left foot on brake), put it into drive or reverse (depends on what’s in front or behind you) and apply the throttle, but for no longer than 20 seconds. Then put it back into neutral and hold the revs at a 1000rpm to cool the trans down, before stalling for another 20 seconds. You need to have a bit of a plan on what joints to check.
            The amount you press the throttle will be how much you load the engine. You should be able to go to full throttle and it should not drive through the brakes.
            The stall speed is between 2000 and 3000rpm. This is the maximum engine speed at full throttle.
            This will build boost and with someone looking listening in the engine bay you should be able to pinpoint the problem. A spray bottle with detergent can help also.
            So if you say it makes the noise when driving normal this is about quarter throttle so only apply that to start with then gradually apply more as required.
            And have that person standing on the side of the car especially if selecting D and watch where they place their feet.
            Please call me Vlad.
            -----------------------
            MY15 NX GLS - SPV EGR; Donaldson filter; Front sensors; Compass; DEI506T and DEI507M; LED interior and exterior lights; Blue LED step lights; 3T tow bar; 20% front & clear tint over privacy windows; Chrome handle protectors; 3x Bushskinz guards; Nudge bar; Hella Sharptones; Dual alarm horns; STEDI lightbar; TC mod loom; Paddles; ProVent 200; Dobinsons springs and MRR shocks; Bonnet struts; OCAM awning; Rear work light; Air compressor. TBD - UHF.

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