Below Nav Bar Ad Module

Collapse

NS turbo over boosting.

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts
  • BruceandBobbi
    Valued Member
    • Aug 2016
    • 3245
    • Greater Sydney

    NS turbo over boosting.

    Finally had enough of Bobbi complaining about the limp mode from over boosting and took the Pajero to a turbo specialist today. Unfortunately the NS turbo is a throw away item if it's over boosting as they are vacuum controlled. Apparently the NT runs a different turbo and can be repaired by replacing the actuator.

    They suggested fitting a Dawes valve. Has anyone here had the Dawes valve fitted or will we be the guinea pigs?
    Last edited by BruceandBobbi; 05-06-17, 08:10 PM.
  • craka
    Valued Member
    • Jun 2009
    • 2057
    • Newcastle (Newie)

    #2
    Originally posted by BruceandBobbi View Post
    Finally had enough of Bobbi complaining about the limp mode from over boosting and took the Pajero to a turbo specialist today. Unfortunately the NS turbo is a throw away item if it's over boosting as they are vacuum controlled. Apparently the NT runs a different turbo and can be repaired by replacing the actuator.

    They suggested fitting a Dawes valve. Has anyone here had the Dawes valve fitted or will we be the guinea pigs?
    How do you know it is overboosting? What error code are you getting?
    NS SWB X 3.2DiD - Factory locker, Hella spotties, GME UHF, 2" lift

    Retired: 1991 NH SWB 3.0L V6 5sp Manual, Mickey Thompson ATZs, GME UHF TX3200.

    Comment

    • starjunk
      Valued Member
      • Mar 2011
      • 653
      • Sydney

      #3
      Originally posted by BruceandBobbi View Post
      Finally had enough of Bobbi complaining about the limp mode from over boosting and took the Pajero to a turbo specialist today. Unfortunately the NS turbo is a throw away item if it's over boosting as they are vacuum controlled. Apparently the NT runs a different turbo and can be repaired by replacing the actuator.

      They suggested fitting a Dawes valve. Has anyone here had the Dawes valve fitted or will we be the guinea pigs?
      Why can't you replace the waste gate actuator on an NS turbo? Sounds like bollocks to me but happy to be corrected. It's a separate unit that unbolts isn't it???
      Check vac hose leading to actuator for leaks too. IMHO it can be one of 3 things: vac leak in hose, vac leak in actuator diaphragm, stuck waste gate. Turbo itself is likely fine.... They are pretty reliable units from my experience. Good luck!
      Oh, and if the actuator is shagged, no reason why an external waste gate and boost controller wouldn't work..... But expensive, likely more so than even a new actuator from MM
      '92 NH GLS LWB 3.0V6 A/T ...sold Please DON'T consider
      '06 NP VR-X LWB Turbo Diesel Sports A/T..sold Please consider
      '96 NJ GLX LWB Turbo Diesel M/T..sold . Loved that car
      '08 NS GLX LWB Turbo Diesel M/T...daily driver. Wake up and Drive!

      Comment

      • MatthewP
        Valued Member
        • Jul 2014
        • 465
        • North of Brisbane

        #4
        Is it a manual or auto?

        I assume its an auto because the manual NS Pajeros have pressure wastgated turbos.

        The NS autos use vacuum actuated vgt turbos.

        All NTs, use the vacuum actuated vgt turbo, so i dont know what they think is different between the NS and NT.

        A dawes valve is a way to physically control boost on the ecu vacuum actuated vgt turbos.

        The dawes valve are very common on Patrols with the ZD30 engine, so you won't be a guinea pig.

        The variable vanes in the turbo may be stuck, or sometimes sticking, in the closed, high boost, position.

        The standard position for the vanes is the open, low boost, position, and when the ecu applies vacuum to the actuator the variable vanes rotate, closing them, and increasing boost pressure.


        You also have to think about how the ECU monitors the boost, that would be causing the overboost code.

        There is a hose running from the MAP sensor to the intake manifold.

        If the hose is partially blocked, then the MAP sensor may not sense the correct pressure,

        Has your Intake manifold been upgraded to the NT intake manifold?

        The hose from the map sensor on the NS joined into the lower part of the intake manifold.
        This was prone to clogging with EGR gunk.

        The NT pajero has the MAP sensor hose joined into the upper intake manifold.

        Is your EGR blocked, or disabled with a resistor mod?

        Your entire intake manifold may need cleaning, to remove the accumulated egr gunk.

        Matt
        Last edited by MatthewP; 06-06-17, 11:24 AM. Reason: Spelling
        05 NP Pajero Platinum 3.2DID Auto

        Comment

        • starjunk
          Valued Member
          • Mar 2011
          • 653
          • Sydney

          #5
          Originally posted by MatthewP View Post
          Is it a manual or auto?

          I assume its an auto because the manual NS Pajeros have pressure wastgated turbos.

          The NS autos use vacuum actuated vgt turbos.

          All NTs, use the vacuum actuated vgt turbo, so i dont know what they think is different between the NS and NT.

          A dawes valve is a way to physically control boost on the ecu vacuum actuated vgt turbos.

          The dawes valve are very common on Patrols with the ZD30 engine, so you won't be a guinea pig.

          The variable vanes in the turbo may be stuck, or sometimes sticking, in the closed, high boost, position.

          The standard position for the vanes is the open, low boost, position, and when the ecu applies vacuum to the actuator the variable vanes rotate, closing them, and increasing boost pressure.


          You also have to think about how the ECU monitors t game e boost, that would be causing the overboost code.

          There is a hose running from the MAP sensor to the intake manifold.

          If the hose is partially blocked, then the MAP sensor may not sense the correct pressure,

          Has your Intake manifold been upgraded to the NT intake manifold?

          The hose from the map sensor on the NS joined into the lower part of the intake manifold.
          This was prone to clogging with EGR gunk.

          The NT pajero has the MAP sensor hose joined into the upper intake manifold.

          Is your EGR block, or disabled with a resistor mod?

          Your entire intake manifold may need cleaning, to remove the accumulated egr gunk.

          Matt
          I've learnt something... I thought all NS's had the standard turbos not VGT. Ignore my previous comment then. Thanks Matt.
          '92 NH GLS LWB 3.0V6 A/T ...sold Please DON'T consider
          '06 NP VR-X LWB Turbo Diesel Sports A/T..sold Please consider
          '96 NJ GLX LWB Turbo Diesel M/T..sold . Loved that car
          '08 NS GLX LWB Turbo Diesel M/T...daily driver. Wake up and Drive!

          Comment

          • BruceandBobbi
            Valued Member
            • Aug 2016
            • 3245
            • Greater Sydney

            #6
            Starjunk.
            Why can't you replace the waste gate actuator on an NS turbo? Sounds like bollocks to me but happy to be corrected. It's a separate unit that unbolts isn't it???


            The information is from one of if not the biggest turbo companies in Australia.
            The waste gate actuator has been replaced recently with no change. The theory is possible carbon build up preventing the waste gate from fulfilling it’s job.


            Cracka.


            Code is p1298. Torque is showing constant 16+PSI going up hills. If I push it it will hit 20PSI and limp mode.

            MatthewP.


            Yes it’s auto. Still has the NS manifold that was cleaned and electronic EGR control fitted at the same time. EGR is closed permanently according to Torque

            Comment

            • starjunk
              Valued Member
              • Mar 2011
              • 653
              • Sydney

              #7
              Originally posted by BruceandBobbi View Post
              Starjunk.
              Why can't you replace the waste gate actuator on an NS turbo? Sounds like bollocks to me but happy to be corrected. It's a separate unit that unbolts isn't it???


              The information is from one of if not the biggest turbo companies in Australia.
              The waste gate actuator has been replaced recently with no change. The theory is possible carbon build up preventing the waste gate from fulfilling it’s job.
              Yep, apologies for my ignorance. I had no idea that the auto version of the NS had the VGT, as mine is a manual. I thought you were saying that they told you the waste gate actuator could not be replaced, but you were referring to the VG actuator that I was unaware existed on an NS. So I wonder then does the manual NT also have standard turbo or VGT? Or are all gen 4 post NS VGT, regardless if M/T or A/T? Just curious.
              '92 NH GLS LWB 3.0V6 A/T ...sold Please DON'T consider
              '06 NP VR-X LWB Turbo Diesel Sports A/T..sold Please consider
              '96 NJ GLX LWB Turbo Diesel M/T..sold . Loved that car
              '08 NS GLX LWB Turbo Diesel M/T...daily driver. Wake up and Drive!

              Comment

              • BruceandBobbi
                Valued Member
                • Aug 2016
                • 3245
                • Greater Sydney

                #8
                Originally posted by starjunk View Post
                Yep, apologies for my ignorance. I had no idea that the auto version of the NS had the VGT, as mine is a manual. I thought you were saying that they told you the waste gate actuator could not be replaced, but you were referring to the VG actuator that I was unaware existed on an NS. So I wonder then does the manual NT also have standard turbo or VGT? Or are all gen 4 post NS VGT, regardless if M/T or A/T? Just curious.

                Not knowing isn't ignorance mate. We all try to help here and yes we do get it wrong sometimes. It's called being human.

                Dawes valve going on Thursday. Anyone have an idea what PSI it should be set at?

                Comment

                • olesp
                  Junior Member
                  • Apr 2013
                  • 41
                  • Esperance WA

                  #9
                  My Dads NS did exactly the same thing kept throwing code P1298.
                  After troubleshooting ourselves ended up taking to the Mitsi Dealer.
                  They replaced a sensor (i will find out which one when i can get hold of the old man) and did an ECU update and it has never ran better.
                  Best part was it only cost $492 all up!
                  Might be worth a trip to the dealer?

                  Comment

                  • BruceandBobbi
                    Valued Member
                    • Aug 2016
                    • 3245
                    • Greater Sydney

                    #10
                    Originally posted by olesp View Post
                    My Dads NS did exactly the same thing kept throwing code P1298.
                    After troubleshooting ourselves ended up taking to the Mitsi Dealer.
                    They replaced a sensor (i will find out which one when i can get hold of the old man) and did an ECU update and it has never ran better.
                    Best part was it only cost $492 all up!
                    Might be worth a trip to the dealer?
                    Thanks heaps. Would love to know the part they replaced. Have been staying away from ECU updates as one tells the ECU to perform a burn every 300 or 400K.

                    Comment

                    • craka
                      Valued Member
                      • Jun 2009
                      • 2057
                      • Newcastle (Newie)

                      #11
                      Originally posted by starjunk View Post
                      Yep, apologies for my ignorance. I had no idea that the auto version of the NS had the VGT, as mine is a manual. I thought you were saying that they told you the waste gate actuator could not be replaced, but you were referring to the VG actuator that I was unaware existed on an NS. So I wonder then does the manual NT also have standard turbo or VGT? Or are all gen 4 post NS VGT, regardless if M/T or A/T? Just curious.
                      Reasonably sure that the from the NT forward both AT and MT have VGT , just the NS auto had VGT.
                      NS SWB X 3.2DiD - Factory locker, Hella spotties, GME UHF, 2" lift

                      Retired: 1991 NH SWB 3.0L V6 5sp Manual, Mickey Thompson ATZs, GME UHF TX3200.

                      Comment

                      • craka
                        Valued Member
                        • Jun 2009
                        • 2057
                        • Newcastle (Newie)

                        #12
                        Check the vacuum hoses with a vacuum pump.
                        If you look at the service manual there is also some method of checking components around the turbo.

                        This is the service manual link http://faq.out-club.ru/download/paje...7/index_M1.htm

                        Look under intake and exhaust on vehicle servicing.
                        NS SWB X 3.2DiD - Factory locker, Hella spotties, GME UHF, 2" lift

                        Retired: 1991 NH SWB 3.0L V6 5sp Manual, Mickey Thompson ATZs, GME UHF TX3200.

                        Comment

                        • BruceandBobbi
                          Valued Member
                          • Aug 2016
                          • 3245
                          • Greater Sydney

                          #13
                          Thanks to everyone that chipped in.

                          Thanks to a couple of PMs with olesp who has confirmed that his Dad's was doing the identical to ours. MM replaced the MAP. Vehicle has been going great since he said.

                          Now the dilemma. Do I replace the MAP or fit the Dawes valve?

                          Comment

                          • craka
                            Valued Member
                            • Jun 2009
                            • 2057
                            • Newcastle (Newie)

                            #14
                            Originally posted by BruceandBobbi View Post
                            Thanks to everyone that chipped in.

                            Thanks to a couple of PMs with olesp who has confirmed that his Dad's was doing the identical to ours. MM replaced the MAP. Vehicle has been going great since he said.

                            Now the dilemma. Do I replace the MAP or fit the Dawes valve?
                            If you have a multimeter you can test the MAP sensor.
                            NS SWB X 3.2DiD - Factory locker, Hella spotties, GME UHF, 2" lift

                            Retired: 1991 NH SWB 3.0L V6 5sp Manual, Mickey Thompson ATZs, GME UHF TX3200.

                            Comment

                            • BruceandBobbi
                              Valued Member
                              • Aug 2016
                              • 3245
                              • Greater Sydney

                              #15
                              Anyone know the resistance reading for the MAP on a NS?

                              Comment

                              Matched content

                              Collapse
                              Working...
                              X