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Thread: (Possibly FIXED!) I'm running out of ideas now (1.9 CDTI 150 low power until 2000rpm)

  1. #1
    Ex-Staff Full Member John LE's Avatar
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    Vehicle : Facelift Insignia/Corsa D

    Trim : LE/VXR

    Engine : 2.0 cdti/1.6 Turbo

    Year : 13/07

    Default (Possibly FIXED!) I'm running out of ideas now (1.9 CDTI 150 low power until 2000rpm)

    Ever since I bought my car i've been disappointed with how dead the car is below 2000rpm.

    As soon as the car hits 2k it's off like a shot and with a cloud of black smoke.

    Since I bought it, it's had

    A new inlet manifold
    New Vac pipes
    The throttle body has been cleaned, cleaned again and i've even driven the car with the throttle body disconnected.
    The egr at first was cleaned, then unplugged, then software deleted and then blanked and it's made no difference.
    All of the boost pipes covered in fairy liquid but there are no leaks - anywhere.
    Umpteen fuel cleaners
    New air filter
    The bcs stripped and cleaned
    Another bcs tried
    The maf stripped and cleaned
    A known working maf tried

    But still the problem persists. I am now onto the theory that the VNT actuator may be sticking (read alot about this on various VAG forums) and i'm led to believe that the vec shares it's turbo with one or two of the VAG diesels.

    Anyone come across this fault? If it is the actuator then I think it's time to change the whole turbo and actuator to cure the fault.

    It's really depressing me now as the car just feels amazing when the boost eventually comes on
    Last edited by John LE; 24th August 2012 at 22:45.

  2. #2
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    I note you have replaced the vac pipes, have you tested the vac solenoids to check they're working as they should

  3. #3
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    Clean/remover the turbo control sensor. Sorted my problem at 1-2000 rev.

    Its the grey/white sensor on slam panel. Filter is under the black hat. Un-click it first b4 removing filter as its permanently fixed.

    Theres a thread on it few days ago.

  4. #4
    Regular Member hothatch's Avatar
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    Vehicle : Insignia

    Trim : SRI NAV

    Engine : 1.6T 180 ECOTEC

    Year : 2012

    Default

    Boost sensor could do with cleaning as geordieric states. I notice is missing from your list. lol. Actually ignore what i just said, you got it under bcs lol.
    Last edited by hothatch; 17th August 2012 at 12:36.

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    There's 2 sensors. One which I mentioned which restricted my lower rev range only it seems. The one on back of engine block hampers the whole rev range(I clean that one once a month or whenever I'm playing. Vectras are so much fun

  6. #6
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    Quote Originally Posted by John IS3 View Post
    But still the problem persists. I am now onto the theory that the VNT actuator may be sticking (read alot about this on various VAG forums) and i'm led to believe that the vec shares it's turbo with one or two of the VAG diesels.
    VNT means variable geometry turbo (or variable nozzle turbo to stay true to the acronym). Are you certain the Z19DTH turbo even has variable geometry?

  7. #7
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    I'm watching this thread with interest. You've got the same problem as me an I've tried most of what you have, apart from cleaning that sensor on the slam panel up, only removed the mesh filter off it!

  8. #8
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    Vehicle : Golf 7

    Trim : GTD

    Engine : 2.0 TDI 184PS

    Year : 2014

    Mileage : 40000

    Default

    Are you sure the Vacuum pump isn't to blame?

  9. #9
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    It looks like you do indeed have a VNT:

    http://garrettbyhoneywell.com/produc...w.php?id=75228

  10. #10
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    As GazCDTI150 says, is your vacuum pump working correctly? This pump is responsible for producing the vacuum that pulls the turbo wastegate actuator. So, even if your vacuum pipes are ok and the boost control solenoid is ok, if insufficient negative pressure is being produced by the pump the actuator may not function as it should.

    However, firstly I would jack up the car, remove the turbo actuator hose and get some clean hose (4mm ID) and suck on it. You should be able to see the actuator rod pull in against its spring (with a torch probably) with little sucking effort. This could at least show you that the actuator is moving freely enough to be pulled in. If this moves freely, then maybe your vacuum pump is struggling or you have a leak/BCS problem you have yet to find. If not, maybe the actuator rod is stuck.

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