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  1. #1
    Reverse Gear

    Join Date
    Nov 2012

    Boost/fuel cut problems :( pi**ed off!!!!

    Wondering if anyone can help having problems with the s3 boost or fuel cut problems when I put my foot down, the obd reader I have has given me the codes 16684 & 16686 also I have a readiness test which is telling me that the catalyst, EVAP sys, and O2 sensor are failing any help would be much appreciated, jus wondering if there a a main culprit that would cause this rather than changing loads of sensors :S

    cheers flemboy

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  3. #2
    <tuffty/>'s Avatar
    Badger 5 Edition

    Join Date
    Sep 2008
    16686/P0302/000770 - Ross-Tech Wiki
    16686/P0302/000770 - Cylinder 2 Misfire Detected
    Possible Causes

    Ignition system
    Fuel injectors
    Fuel pressure
    Running out of fuel
    EVAP canister purge valve
    Evaporative emission system
    Low compression
    Base engine problems
    Controle Module damaged

    16684/P0300/000768 - Ross-Tech Wiki
    16684/P0300/000768 - Random/Multiple Cylinder Misfire Detected
    Possible Causes

    Air Intake System leaking
    Fuel Supply faulty
    Injector(s) faulty
    Ignition Cable(s) and/or Spark Plug(s) faulty
    Ignition Coil(s) faulty
    Exhaust Gas Recirculation (EGR) Valve (N18) stuck/open
    Camshaft Position Sensor (G40) faulty

    Possible Solutions

    Check Misfire Recognition
    Check Air Intake System
    Check Fuel Supply
    Check Injector(s) and Injector Sealing
    Check Ignition Cable(s) and Spark Plug(s)
    Check Ignition Coil(s)
    Check Exhaust Gas Recirculation (EGR) Valve (N18)
    Check Camshaft Position Sensor (G40)

    I would say a fault coil pack...

    What year/engine code S3?

    Silver 2001 AMK S3. Silver alcantara interior... now with added powarrrrrrrr, torques. VAGCOM + KII-USB. >> My build thread...

  4. #3
    Reverse Gear

    Join Date
    Nov 2012
    It's a BAM engine on an 02 plate, reckon faulty coil pack isir? It's only under full throttle really starts at about 2.8k at full throttle where I'm guessing its at full boost, I haven't got a PCV valve, n249 is bypassed so a lot of vacuum hoses are gone, whenever I've had a split hose on other cars its just a loss of power rather than boost or fuel cut so I don't think it's that really, could the heat effect anything?

  5. #4
    Westy's Avatar
    Double Dark Side! Diesel & 8P

    Join Date
    Dec 2008
    Cambridgeshire sometimes Hertfordshire
    Does sound like a coil pack, possibly 2!

    Move the coil pack from cylinder 2 to another cylinder and see if te fault code follows it.
    Last edited by Westy; 10th July 2013 at 17:42.
    8P A3 TDI - 220bhp - 335lbft
    A3 Maintenance Thread
    Bye bye S3 you will be missed.
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  6. #5
    Reverse Gear

    Join Date
    Nov 2012
    I moved coup pack 2 to 3 cleared the codes that where in there and drove it but the code hasn't come back, still doing it though but it seems to be constant now at the same revs regardless of throttle position, don't think it was driven for long enough though so when I drive to work tomorrow ill check it then aswell try and determine if its a coil or not

  7. #6
    1st Gear

    Join Date
    Mar 2013
    Chelmsford , Essex .
    Now I'm no expert , but the first thing that pops into my head is you had a problem with what seems like a coil pack which was a a given rpm upwards and you've now unplugged coil packs and now the problem is across the rev range SO I suggest check your coil pack loom , my reasoning is if your loom was suffering the common breakdown problem you may well have disturbed some already suspect insulation and inadvertently made things worse !
    Could be wrong but wort a check ?
    1999 Silver 8L A3 1.8t sport (AGU) currently undergoing rolling modification
    pipercross panel , bosch super 4's , poly bushed front end , yellow dogbone , self refurbed 16" speedlines , ambient lighting.............TBC



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