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S3, no boost at all?

Discussion in 'A3/S3 Forum (8L Chassis)' started by imported_kennyf, May 12, 2005.

  1. imported_kennyf
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    imported_kennyf Guest

    [May 12, 2005]
    Car is currently running without any boost at all and the engine light has popped on after it running like this for a few days? Any ideas before I take to an Audi specialist for diagnaustic?

    Does anyone know of any Audi specialists in Glasgow , I've heard of one Ian Coper in Kirky any past customers?

    all help appreciated.
    #1
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  3. C_Audiboy
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    C_Audiboy Vroom Vroom

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    [May 12, 2005]
    Is the car shaking, and does it smell bad - like unburned fuel?

    It could be the coil packs if you have these symptoms too......
    #2
  4. imported_kennyf
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    imported_kennyf Guest

    [May 12, 2005]
    No mate, runs fine , but just no boost. Had the coilpacks done less than a month ago too. I had fitted a BMC filter and it ran bad then so a returned to the OE filter and the car was fine. So i assumed it was the BMC causing the poor performance., but now its happened again! When the car is reved you can feel the boost in the pipes but just no power when driving.......
    #3
  5. pure
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    pure Member

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    [May 12, 2005]
    check for leaks in the pipes maybe? U know anybody with vag-com?

    Is the car chipped? and what N75 valve does it have?
    #4
  6. imported_kennyf
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    imported_kennyf Guest

    [May 13, 2005]
    Going to have a check round the car this morning . The car is remapped adn I'm not sure what the "N75" valve is ....... Don't know anybody with Vagcom unless there is someone in the glasgow area with at all???
    #5
  7. DAF
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    DAF Member

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    [May 13, 2005]
    what about the air flow mass meter?????????
    #6
  8. Offline

    Guest

    [May 13, 2005]
    Ive been through this with my car...

    Could be the MAF sensor if the car feels flat all the time, could be the N75 if boost is inconsistent. May also be an air leak in the pressurised area of the inlet tract - does the car shake at all under acceleration? get a friend to drive behind you when you boot it, does black smoke come out the exhaust? if so its a boost leak.

    could be any manner of things, good luck with finding it matey!
    #7
  9. HTC
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    HTC Active Member

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    [May 13, 2005]
    Prob in limp home mode. Try disconnecting the battery for half an hour.

    You may have overboosted?
    #8
  10. imported_kennyf
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    imported_kennyf Guest

    [May 13, 2005]
    that seems to have done it, the engine light is off and I now have boost again...... I've dropped it into my local vag-com place to find out what the error codes says just in case.

    So see if I hadn't disconnected the battery would this have self cleared after a time?

    Is this something I could have avoided
    #9
  11. dickys3
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    dickys3 Moderator Staff Member Moderator

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    [May 13, 2005]
    Check the FAQ at the top of this forum...... There is info there.
    #10
  12. imported_Pures3work
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    imported_Pures3work Guest

    [May 13, 2005]
    Sounds like you have overboosted. You more than likely have an N75J or H valve which are more agressive and are know to spike / overboost.

    Do a search for N75 and you should be able to find out where it is in the engine bay.

    If it keeps happening you might need to buy a manual boost controller. There only about £20 and work great.
    #11
  13. imported_kennyf
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    imported_kennyf Guest

    [Jun 12, 2005]
    the N75 fitted is an f, i've regressed back to standard filter but the problem is still persisiting! removing the earth from for 30min cures this but only for a short while, any ideas?
    #12
  14. Khufu
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    Khufu Active Member

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    [Jun 15, 2005]
    Here are the problems listed on Kenny's car. Any suggestions as to what is causing what?

    -------------------------------------------------------------------------------
    Address 01: Engine
    Controller: 8N0 906 018 J
    Component: 1.8L R4/5VT 0004
    Coding: 10710
    Shop #: WSC 13622

    7 Faults Found:
    18010 - Power Supply Terminal 30: Voltage too Low
    P1602 - 35-10 - - - Intermittent
    17951 - Angle Sensor 1 for Throttle Actuator (G187): Signal too Small
    P1543 - 35-10 - - - Intermittent
    17580 - Angle Sensor 2 for Throttle Actuator (G188) Signal too Low
    P1172 - 35-10 - - - Intermittent
    17705 - Pressure Drop between Turbo and Throttle Valve (check D.V.!)
    P1297 - 35-10 - - - Intermittent
    17987 - Throttle Actuator (J338): Adaptation Not Started
    P1579 - 35-10 - - - Intermittent
    17536 - Fuel Trim: Bank 1 (Mult): System too Lean
    P1128 - 35-10 - - - Intermittent
    16486 - Mass Air Flow Sensor (G70): Signal too Low
    P0102 - 35-10 - - - Intermittent
    Readiness: 0000 0000

    -------------------------------------------------------------------------------
    Address 17: Instruments
    Controller: 8L0 920 980 L
    Component: AB-KOMBIINSTR. VDO D12
    Coding: 01444
    Shop #: WSC 00847
    WAUZZZ8LZ1A054633 AUZ7Z0Y1650281
    1 Fault Found:
    01314 - Engine Control Module
    49-10 - No Communications - Intermittent

    -------------------------------------------------------------------------------
    Address 22: AWD
    Controller: 02D 900 554 B
    Component: HALDEX LSC ECC 0006
    1 Fault Found:
    01314 - Engine Control Module
    49-10 - No Communications - Intermittent

    -------------------------------------------------------------------------------
    Address 35: Centr. Locks
    Controller: 8D0 862 257 E
    Component: CV-Pump, Alarm, RC D17
    Coding: 15178
    Shop #: WSC 06435
    9 Faults Found:
    01367 - Central Locking Pump Run Time Exceeded (Likely Leak)
    35-00 - -
    01371 - Alarm triggered by Door Contact Switch: Driver's Side
    35-00 - -
    01370 - Alarm triggered by Interior Monitoring
    35-00 - -
    01366 - Opened Due to Crash Signal
    35-00 - -
    01365 - Lock/Unlock Switch: Interior
    29-00 - Short to Ground
    00991 - Interior Lights
    28-00 - Short to B+
    00955 - Key 1
    09-00 - Adaptation Limit Surpassed
    00956 - Key 2
    09-00 - Adaptation Limit Surpassed
    01134 - Alarm Horn (H12)
    49-10 - No Communications - Intermittent
    #13
  15. simont
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    simont Member

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    [Jun 15, 2005]
    I'm no expert but:

    in order:
    [ QUOTE ]
    18010 - Power Supply Terminal 30: Voltage too Low
    P1602 - 35-10 - - - Intermittent


    [/ QUOTE ]

    check the battery terminals to make sure they are tight.

    [ QUOTE ]

    17951 - Angle Sensor 1 for Throttle Actuator (G187): Signal too Small
    P1543 - 35-10 - - - Intermittent
    17580 - Angle Sensor 2 for Throttle Actuator (G188) Signal too Low
    P1172 - 35-10 - - - Intermittent
    17705 - Pressure Drop between Turbo and Throttle Valve (check D.V.!)
    P1297 - 35-10 - - - Intermittent
    17987 - Throttle Actuator (J338): Adaptation Not Started
    P1579 - 35-10 - - - Intermittent



    [/ QUOTE ] looks like a throttle body type issue - do you know someone with a similar S3/TT you can swap it with?

    If you can do a throttle adaptation via vag-com (basic settings, 060), then see if the performance returns. If it does return, but drops off again after a period, this could indicate a dodgy throttle body motor unit.

    Also check out the vacuum hoses connecting the N249 valve with the DV etc.

    [ QUOTE ]

    17536 - Fuel Trim: Bank 1 (Mult): System too Lean
    P1128 - 35-10 - - - Intermittent
    16486 - Mass Air Flow Sensor (G70): Signal too Low


    [/ QUOTE ]

    seen this before - most probably caused by a faulty air mass meter. if you clear the codes, then try unplugging the electrical connector off the air mass meter and see if the performance improves. If so then your air mass meter is shot and you can get an exchange one cheap enough from Audi.

    #14
  16. imported_kennyf
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    imported_kennyf Guest

    [Jun 15, 2005]
    Major thanks to Ewan for taking the time to look at this. Had a push and a prod with the DV and the maf connections whilst at Ewans. The drive home was em better but still not right. The boost was very "choppy" it would come on and off in no real fashion. Sometimes it'd boost all the way through the gear , other times up to 3k then cut out then back on at 4k.

    Thanks for the info Simon

    All opinions welcome, the more ideas there's a better chance of my car not being attacked by a claw hammer!
    #15

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