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120 LC injectors/ fuel pump issue

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  • 120 LC injectors/ fuel pump issue

    Hi guys,

    This week my lovely 120 LC started to make a big noise while i'm driving, on idle, also big vibrations.
    My service sent injector to test, and the results are that all 4 must be change, 3 were not able to be tested(don't know yet why), 1x in tolerance, but with higher value - exchange recommended.
    Service told me that I must change also fuel pump, because later could damage new injectors, because of metal pieces(the pump will be sent for tests).

    I must say that for more than a year my car started to have that cold knocking during first 5-10 min, when accelerating, around 1.500-2.000 rpm. After 10 min no noise.
    I went to Toyota dealer, they said that is normal and other 4 services - no issue found

    I've attached results from injectors testing, also my google drive link with more output.
    https://drive.google.com/file/d/0B4P...ew?usp=sharing

    Should I change all 4 injectors?
    What about fuel pump? Can really affect new injectors later?

    Thanks!
    Attached Files

  • #2
    Not sure what the report is saying, but If your injectors are >120,000 km I would change them anyway. Knocking also indicates they are ready to be changed
    Greg - 08 D4D Prado,
    Some trips done - Cape York, Fraser Island, Simpson Desert / Central Aust, Vic High Country.

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    • #3
      Originally posted by Corigator View Post
      Not sure what the report is saying, but If your injectors are >120,000 km I would change them anyway. Knocking also indicates they are ready to be changed
      thanks for your reply

      car has 185k; I have it for couple of years and i'm pretty sure that it has original injectors, Denso.
      I'll change the injectors during this month.
      Service recommend me to change also injection fuel pump, as they stated that it can damage new injector also, but because it is expensive it's on hold for the moment.

      What do you think?

      Comment


      • #4
        Never read anywhere here on this forum that you need to change the fuel pump. There are two, one in tank and also a high pressure pump and I assume they mean the high pressure pump?. I actually asked Anth (#############) whether the fuel pump ever needs replacing when he did my injectors recently and he said no.
        2010 150 Glacier White GXL D4D Auto

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        • #5
          Originally posted by Riv39 View Post
          Never read anywhere here on this forum that you need to change the fuel pump. There are two, one in tank and also a high pressure pump and I assume they mean the high pressure pump?. I actually asked Anth (#############) whether the fuel pump ever needs replacing when he did my injectors recently and he said no.
          I know, but I live in CZ , so my service and also local Toyota service wants to test also the fuel pump, as if not they will not provide warranty for the injectors.

          Anyway, I've ordered 4 new injectors; is there any thing more to do usually is when injectors are replaced? sorry but i'm new into this.
          e.g:
          check valve clearances?
          Egr clean? - done
          Manifold removal & clean?
          re-code new injectors into the ECU?

          Comment


          • #6
            Check the valve clearances and re-code the new injectors. Clean the air intake and EGR. No need to clean the manifold (so I'm told and what I have read here on the forum). Install EGR restriction plate (7mm hole) where the EGR pipe to the EGR cooler meets the engine block.
            2010 150 Glacier White GXL D4D Auto

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            • #7
              Originally posted by Riv39 View Post
              Check the valve clearances and re-code the new injectors. Clean the air intake and EGR. No need to clean the manifold (so I'm told and what I have read here on the forum). Install EGR restriction plate (7mm hole) where the EGR pipe to the EGR cooler meets the engine block.
              I've changed the injectors/re-coded was done.
              Noise is still there.

              The did not checked yet the valve clearances.
              No error codes on diagnostic.
              Any idea?

              Comment


              • #8
                mechanics said that it could be some hydraulic valve lifter problem

                Comment


                • #9
                  Mate…….think it's time for a new mechanic. Hydraulic lifters?????

                  Comment


                  • #10
                    well, I sent the car to Toyota service.
                    The loud noise is still there.

                    I've uploaded a short video:
                    https://www.youtube.com/watch?v=_0KzHW5ZofU

                    Comment


                    • #11
                      So, after a long while, one Toyota service stated that could be the flex-plate, another Toyota service said that it could be crank-pin bearing(engine must be disassemble). That's crazy.
                      Any ideas?

                      Comment


                      • #12
                        Originally posted by matricea View Post
                        So, after a long while, one Toyota service stated that could be the flex-plate, another Toyota service said that it could be crank-pin bearing(engine must be disassemble). That's crazy.
                        Any ideas?
                        I think I would be avoiding "Toyota service" and trying to find a good independent diesel mechanic. Someone with a stethoscope might be able to narrow down the source, can you tell whether it is coming from the top or bottom of the motor?

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                        • #13
                          First I went to Independent service. Their statement is that the noise is coming from the top of the engine; Toyota said that they are not able to determine the exact pin-point of the noise.
                          Independent service used stethoscope, not sure how accurate they were.
                          Independent service said that new injectors are in normal parameters, valve clearance checked, engine compression is ok. These things were double checked by Toyota service.
                          Last edited by matricea; 08-09-2017, 06:24 AM.

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                          • #14
                            Does anybody know what is that stuff between injector and engine column?
                            Toyota said that is something like a silicone, put by previous service.Click image for larger version

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                            • #15
                              Looks like silicon. Whoever took the rocker cover off got lazy and didn't replace the seal around the top of the injector.
                              2008 GXL D4D + Option Pack 1, Safari snorkel, factory alloy bar, dual battery system, Lovells TFR-118/TRR119 Springs, Bilstein Shocks, Prodigy P3 brake controller, factory tow bar, Orac coupling.

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