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Opel Vectra C 1.9 dth 150 km - No power up to 2.5 thousand revolutions

jerrydzwonkow 13053 8
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  • #1 16696255
    jerrydzwonkow
    Level 12  
    Hello. Opel Vectra C 2004 1.9 dth 150 km. 280 thousand km. The car does not go up to 2.5 thousand turns. What was checked and done:
    1. Computer diagnosis - when driving from approx. 1800 rpm Charging pressure approx. 2.4 bar, and the turbine beats 1.5 bar, only at 2600 rpm. the pressure increases to 2.2 bar and continues to increase. Occasionally, error p0234 will appear positive pressure control circuit
    2. The intake manifold with flaps works properly during the computer test (it was changed in 2014 to a new one)
    3. The Egr valve is also ok. During control it rises and lowers and is tight (also from 2014 and a gasket with four holes). At the test, he was blinded with a metal plate, unchanged.
    4. Intercooler and snake all but skipped for a trial, nothing helped.
    5. Turbine control valve in working order, vacuum to the valve about 0.8 from the valve to the turbine about 0.5. Substituted for trial the second working the same. Airtight hoses.
    6. The flow meter measures well. A second functional one was tested, unchanged.
    7. Dpf saturation 35%, I don't remember the pressure difference now. For the test, the pipe behind the catalyst was detached and the test drive, unchanged.
    8. Checked the timing, correctly positioned, the lock on the upper shaft and the crankshaft cap all fit
    9. Manifold pressure sensor cleaned.
    Initial diagnosis: turbine problem.
    10. The turbine inserted after regeneration, test drive and geometry stood up. The turbine removed blocked the steering wheels on the amen. Inserted a second turbine from another source also after regeneration ... there is still no force from below. The set pressure does not reach and these 2.2 bars are only after 2.5 thousand / rev even about 3 thousand / rev. reaches.
    Personally, I do not believe in these regeneration of turbines, I have had a few cases that the regeneration turbo did not go from below, I put on a new turbine or ory. used and power returned. But the client here insisted that the turbo will deliver after regeneration and that is how it looks at this moment.
    There is no hole leak in the IC leads.
    Many other things were checked, what I recall I will write.
    Hands fall down and no ideas. I am asking forum members for suggestions on what else to check.
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  • #2 16696482
    ptr92
    Level 19  
    And what pressure does the boost pressure transducer have?
    Behind the catalyst? So the exhaust gas went through the DPF and the catalyst? Check the differential pressure at idle. It should not be above 5mbar.
    EGR was removed and checked if it closes?
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  • #3 16696547
    jerrydzwonkow
    Level 12  
    To transmitter 0.8. I unhooked the pipe after the catalyst, i.e. the exhaust gas only passed through the catalyst bypassed the DPF. Differential pressure at idle speed 3 mbar. Egr removed closes easily.
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  • #5 16699315
    ptr92
    Level 19  
    0.8 bar? The vacuum pump should do a vacuum of about 0.1 bar. Either you have a leak in the vacuum or the pump is too weak
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  • #6 16699573
    invisibleman
    Level 20  
    Camshafts not worn?
  • #7 16701264
    jerrydzwonkow
    Level 12  
    ptr92 wrote:
    0.8 bar? The vacuum pump should do a vacuum of about 0.1 bar. Either you have a leak in the vacuum or the pump is too weak

    My mistake ... I didn't give the units I measured. Vacum pump gives -1 bar, and the turbo output from the valve and at the pear is the same and amounts to 0.6 bar.

    Added after 4 [minutes]:

    invisibleman wrote:
    Camshafts not worn?

    I did not check the rollers ... it is possible that the turbo does not hit the bottom, because the cams are worn? Engine operation without reservations, in vw injection pump the first signal that something with a roller or glasses is "puffing" into the air filter. It's not here.
  • #8 16702374
    ptr92
    Level 19  
    And try to remove it from him and cover the hole in the inlet so that he does not pull the left air behind the flow meter. Maybe the engine already has such a scavenge that the flow meter cannot see the proper air flow.
    I wonder what the catalyst looks like, maybe cracked? You would have to unscrew the first probe (I think it is in them) and try then.
    Although I bet more on this form
  • #9 16708452
    jerrydzwonkow
    Level 12  
    The whole catalyst, when the dpf was unscrewed, the exhaust gas was easily blown by the executioner. Odmy did not check, the client took the car. I stay with my, that the turbo after regeneration is limping. Before Saturday, the customer brought a regenerated turbo to replace him in the b5 passat and every ... turbo beats from 3 thousand turns. The old one was beating well from below, but the oil was already draining and the geometry stopped.

Topic summary

The discussion revolves around an Opel Vectra C 1.9 DTH (2004) experiencing a power issue, where the engine fails to exceed 2,500 RPM. The user has conducted several checks, including computer diagnostics revealing a P0234 error code related to positive pressure control. The intake manifold and EGR valve have been verified as functional, and the turbo control valve is operational with appropriate vacuum levels. Suggestions from other users include checking the boost pressure transducer, differential pressure across the DPF and catalyst, and potential vacuum leaks. There are also considerations regarding the condition of the camshafts and the possibility of turbocharger issues, particularly after a recent regeneration. The user has not yet checked the oil drainage or the condition of the catalyst.
Summary generated by the language model.
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