Skoda Octavia Limp mode

Discussion in 'SEAT and Škoda TDI' started by jackg, Jul 21, 2015.

  1. jackg

    jackg New Member

    Joined:
    Sep 12, 2013
    Messages:
    9
    Car:
    2003 Skoda Octavia 110BHP ASV engine.
    Location:
    Wotton under Edge, Gloucestershire, England, UK
    2003 Skoda 1.9TDI 110BHP ASV engine, 152k.
    January 2015: Bought the car.
    February: Limp mode showed up. Using a VCDS lite and ebay cable, fault code: 17965. P1557 charge pressure control: positive deviation.
    April: Removed inlet and exhaust manifolds. Cleaned inlet manifold of soot and carbon build up, the inlet was badly clogged. Stripped and cleaned the turbo. Cleaned no.2 inlet port of carbon build up, as I was not too sure if this was a good idea with a valve open, fortunately no.2 valve was closed.
    Replaced all vacuum tubing with silicone tubing and as I broke one connection on the N75, I replaced that with a new VW N75.
    Silicone tubing used was 3mm ID, 7mm OD and 5mmID, 10mm OD.
    Still had limp mode, same code: 17965.
    July: replaced the MAF sensor with a new VW one from a private ebay seller.
    No difference.

    When driving it at low revs the engine does not seem completely even and it seems to lack power. Also it will cough twice before picking up, only does this once usually after starting off.
    It will go to more than 4000RPM so long as limp mode does not kick in.
    Intermittent limp mode, with the only pattern being that if it is driven gently this seems to trigger limp mode more than harder driving.
    The limp mode varies, sometimes at 3000RPM other times at 2k or 2.5k.

    With the car stationary and out of gear and warm, I carried out the following measurements using VCDS lite:
    Engine>measuring blocks>code 03 EGR
    RPM---Air mass specified------AIR mass actual-------EGR solenoid (%)
    903--------------265----------------------- 270--------------------68.1
    1449-------------280-----------------------275--------------------60.2
    1932-------------285-----------------------285--------------------65.7
    2499-------------310-----------------------310--------------------63.4
    2751-------------330-----------------------325--------------------61.8
    3021-------------358-----------------------510---------------------4.8
    3360-------------390-----------------------520---------------------4.8
    3528-------------630-----------------------470---------------------4.8
    3822-------------850-----------------------465---------------------4.8

    Hopefully some informed individual can inform me as to what is going on.
    Clearly above 3000RPM something is not working as it should.
     
  2. Seatman

    Seatman Well-Known Member

    Joined:
    Jul 9, 2010
    Messages:
    5,818
    Car:
    2000 Mk4 Golf Estate 1.9tdi 174 bhp
    Location:
    Scotland
    Mods:
    PP764's, turbo and mapping
    You need to put the engine under load for testing the maf, 3rd gear and foot to the floor then see how it lines up.

    Also the actuator itself could be bad, weak spring or damaged diaphragm
     
  3. Oldaccord

    Oldaccord Active Member

    Joined:
    Jan 11, 2014
    Messages:
    661
    Car:
    1998 Beetle TDI
    Location:
    BC, Canada
    VAG Error Code: 17965/005463

    EOBD II Error Code: P1557

    Fault Location:
    Charge Pressure Control - Positive Deviation

    Possible Cause:
    Reduced power output.
    Limp mode.

    Boost Pressure too High.
    Hoses/Pipes incorrectly connected, disconnected, blocked or leaking.
    Charger Pressure Control defective.
    Variable Nozzle Turbo (VNT) nozzles stuck.
    Solenoid Valve for Boost Pressure Control (N75) defective.

    Possible Solutions:
    Check Hoses/Pipes to/between Components.
    Check Solenoid Valve for Boost Pressure Control (N75).
    Check/Clean/Replace Charge Pressure Control.
    Check/Clean mechanism for variable nozzles.

    As taken from keithuk's Free EOBD II Error Codes software
     
  4. jackg

    jackg New Member

    Joined:
    Sep 12, 2013
    Messages:
    9
    Car:
    2003 Skoda Octavia 110BHP ASV engine.
    Location:
    Wotton under Edge, Gloucestershire, England, UK
    Thankyou.

    There is not a lot left to replace or clean apart from the actuator. I could have reassembled it the wrong way round with the vent hole exposed instead of covered up/protected by the heat shield, not sure if that is right but there is a youtube video abut the actuator adjustment which made me wonder if I reassembled it the correct way.

    I think I got it the right way round as there was stain on the heatshield from the vent hole.

    From what I read overboost is unlikely to be caused by a bad MAF.
     
    Last edited: Jul 22, 2015
  5. jackg

    jackg New Member

    Joined:
    Sep 12, 2013
    Messages:
    9
    Car:
    2003 Skoda Octavia 110BHP ASV engine.
    Location:
    Wotton under Edge, Gloucestershire, England, UK
    I replaced the actuator and that was the problem.
    Bought a Garrett one from the bay. Common to a lot of VW cars.
    The old one had less spring preload than the new one.
     
  6. Seatman

    Seatman Well-Known Member

    Joined:
    Jul 9, 2010
    Messages:
    5,818
    Car:
    2000 Mk4 Golf Estate 1.9tdi 174 bhp
    Location:
    Scotland
    Mods:
    PP764's, turbo and mapping
    Cool, not seen it a lot myself but have read that it can be a problem.
     

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