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Thread: 1.6 tdi losing power

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  1. 1.6 tdi losing power 
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    Hi - my daughter's 1.6 tdi has developed a fault where there's loss of power under the following conditions:

    When engine has warmed up to around 75C and above, and whilst driving at 50mph in 5th gear at around 1400rpm, the engine falters and starts to run very unevenly, accompanied by serious loss of power. The only way to overcome this, is to drop down to 3rd gear, and raise the revs. It will then be ok for a variable amount of time - then the fault recurs. The flashing coil warning light also comes on - different codes have been generated after episodes of the same problem, indicating the coolant temperature sensor was faulty, and then the air flow sensor.. Both of these have been replaced, but the fault is still occurring. Please help.

    Thanks,

    Ron
     
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  2. Re: 1.6 tdi losing power 
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    Quote Originally Posted by Doonthewatter View Post
    Hi - my daughter's 1.6 tdi has developed a fault where there's loss of power under the following conditions:

    When engine has warmed up to around 75C and above, and whilst driving at 50mph in 5th gear at around 1400rpm, the engine falters and starts to run very unevenly, accompanied by serious loss of power. The only way to overcome this, is to drop down to 3rd gear, and raise the revs. It will then be ok for a variable amount of time - then the fault recurs. The flashing coil warning light also comes on - different codes have been generated after episodes of the same problem, indicating the coolant temperature sensor was faulty, and then the air flow sensor.. Both of these have been replaced, but the fault is still occurring. Please help.

    Thanks,

    Ron
    And what are codes saying following renewal of cts and air mass?
     
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  3. Re: 1.6 tdi losing power 
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    Quote Originally Posted by vag_tech View Post
    And what are codes saying following renewal of cts and air mass?
    Hi - just spoken to the garage: P0101, which I understand is the MAF again.
     
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  4. Re: 1.6 tdi losing power 
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    Some logging would be handy here to get a look at some values when fault occurs. If ur getting a MAF code the EGR could be misbehaving (MAF provides feed back on EGR Operation).


    Sent from my iPhone using Tapatalk
     
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  5. Re: 1.6 tdi losing power 
    #5
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    CAYB/C engines are notorious for EGR unit failure.
    Anthropogenic climate change, the biggest con inflicted on mankind since religion...

    Slava Ukraini
    !


     
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  6. Re: 1.6 tdi losing power 
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    Quote Originally Posted by Crasher View Post
    CAYB/C engines are notorious for EGR unit failure.
    Yes - you were spot on, thanks. It was indeed an egr valve failure - though it was a bit unusual in that it seemed to require to warm up before it began to stick intermittently.
     
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  7. Re: 1.6 tdi losing power 
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    VAG Error Code: 16485/000257/4794/5667

    EOBD II Error Code: P0101

    Fault Location:
    Mass Air Flow (MAF) Sensor (G70) - Circuit Range/Performance Problem/Implausible Signal

    Possible Cause:
    Malfunction Indicator Lamp (MIL)(K83) active.
    Loss of Power.
    Erratic Idle.

    Wiring/Connector(s).
    Air Leak(s) after Mass Air Flow (MAF) Sensor (G70) .
    Excessive restrictions in the Intake/Exhaust System.
    Dirty air filter, clogged snow screen, clogged CAT.
    Mass Air Flow (MAF) Sensor (G70) faulty,
    Ground Spots corroded or Paint Residue.

    Possible Solutions:
    Check/Replace all faulty Wiring/Connector(s).
    Check Intake Air Filter.
    Check Mass Air Flow (MAF) Sensor (G70).
    Check Earth Points.
    Read Measuring Value Blocks (MVB).
    Mass air flow vs upper threshold model < 60 - 800 kg/h.
    Lower threshold model < 0 - 400 kg/h.
    Load calculation > 18%.
    Fuel system < -17%.

    Special Notes:
    In MY 1995-2002 (?) in Europe at VW diesel cars Mass Air Flow (MAF) Sensor (G70) had the bad reputation of slowly losing his performance, causing loss of power. It's not a matter of defective or breaking down, but it is filthy / dirty (not easy to clean). You can check functionality by making a log in [01-engine], [Measuring Value Blocks (MVB) - 08], group 003 (3e gear, full throttle, from 1700-4000rpm).
    It is not uncommon for a TDI to set Implausible Signal Mass Air Flow Sensor (G70) faults when the engine performance is reduced due to a mechanical problem. These
    mechanical problems may include, but are not limited to:
    Faulty electric fuel pump or Restricted fuel filter. See the page for Basic Settings tips after replacement.
    Excessive restrictions in the intake/exhaust system.Internal camshaft/valve/lifter problems.

    Tech Notes:
    Before replacing the mass air flow sensor, try replacing the airfilter and cleaning the air flow sensor with low compress air or mass air flow sensor cleaner. Reset code and drive vehicle. If the code comes back, it may be necessary to replaced the mass air flow sensor.

    When is the code detected?:
    A high voltage from the sensor is sent to Engine Control Module (ECM) under light load driving condition.
    A low voltage from the sensor is sent to Engine Control Module (ECM).

    Description:
    The Mass Air Flow (MAF) Sensor (G70) is placed in the stream of intake air. It measures the intake flow rate by measuring a part of the entire intake flow. It consists of a hot film that is supplied with electric current from the Engine Control Module (ECM).

    The temperature of the hot film is controlled by the Engine Control Module (ECM) a certain amount. The heat generated by the hot film is reduced as the intake air flows around it. The more air, the greater the heat loss. Therefore, the Engine Control Module (ECM) must supply more electric current to maintain the temperature of the hot film as air flow increases. The
    Engine Control Module (ECM) detects the air flow by means of this current change.

    There are 23 codes for Engine Coolant Temperature Sensor (G62) you need to post that one?

    As taken from my new EOBD II Error Codes
    2010 Golf GTD (170) CBBB, 5 Door, Shadow Blue (P6/D5Q), Flat Tyre Indicator, Basic Protection Pack + VCDS.
     
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  8. Re: 1.6 tdi losing power 
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    Yes, the leak of unmeasured exhaust gas back into the intake confuses the ECU so it thinks the AMM is faulty when it isn't, basically a leaking EGR valve is just like an air leak after the AMM.
    Anthropogenic climate change, the biggest con inflicted on mankind since religion...

    Slava Ukraini
    !


     
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  9. Re: 1.6 tdi losing power 
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    I have the same exact issue. It happened after replacing a failed injector. I have inspected the airflow sensor and it looks brand new indicating the garage replaced this previously. However I did find a hose which connects to the air box had split at the end and had been tapped with electrical tape.... not at all sealing the hose to connector... would this cause a fault to appear?
     
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  10. Re: 1.6 tdi losing power 
    #10
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    Quote Originally Posted by Crasher View Post
    Yes, the leak of unmeasured exhaust gas back into the intake confuses the ECU so it thinks the AMM is faulty when it isn't, basically a leaking EGR valve is just like an air leak after the AMM.
    This was the issue on my car. The flap in the EGR valve had fallen of the axle. The welded joints had given up.
     
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