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  1. #1
    Active Member One Ring
    Join Date
    Jun 29 2018
    AZ Member #
    421501
    Location
    sweden

    faulty coil or fuel injektor 2.0 tfsi

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    Hi!
    My 2010 A5 888 2.0 tfsi engine just lost power, mil and ESP is on.
    Vcds says misfire on cylinder 3
    P0303 Misfire Detected
    p130A Cylinder Disabling
    P0300 Random/Multiple Cylinder Misfire Detected
    Engine is hard to start, got no power and got a bad smell and smoke of fuel from the exhaust
    Engine does not start up easy, shakes/does not run smooth, and feels and sounds like one cylinder is dead.
    Do you think this is a bad ignition coil or a bad injector?

  2. #2
    Established Member Two Rings wunderman4's Avatar
    Join Date
    Aug 10 2008
    AZ Member #
    31812
    My Garage
    2015 VW Passat 1.8T
    Location
    Phoenix, Arizona

    Check the plugs, then swap the coils and see if the cylinder changes.

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  3. #3
    Active Member One Ring
    Join Date
    Jun 29 2018
    AZ Member #
    421501
    Location
    sweden

    Quote Originally Posted by wunderman4 View Post
    Check the plugs, then swap the coils and see if the cylinder changes.
    Iím going to do that.
    Strange thing, I cleared the codes just to confirm fault in no 3.
    Now there no codes at all but engine still hard to start, shakes/vibrates, sounds like itís only on 3 and there that massive smoke smelling fuel from the exhaust.
    Iím thinking more and more in faulty / stuck open injector, but how to confirm if and which one(s)?

  4. #4
    Established Member Two Rings wunderman4's Avatar
    Join Date
    Aug 10 2008
    AZ Member #
    31812
    My Garage
    2015 VW Passat 1.8T
    Location
    Phoenix, Arizona

    Quote Originally Posted by snowmad View Post
    Iím going to do that.
    Strange thing, I cleared the codes just to confirm fault in no 3.
    Now there no codes at all but engine still hard to start, shakes/vibrates, sounds like itís only on 3 and there that massive smoke smelling fuel from the exhaust.
    Iím thinking more and more in faulty / stuck open injector, but how to confirm if and which one(s)?
    Just keep eliminating other possibilities
    https://youtu.be/vmMKCxqoZvw


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  5. #5
    Active Member One Ring
    Join Date
    Jun 29 2018
    AZ Member #
    421501
    Location
    sweden

    i will do that!
    thanks!!

  6. #6
    Established Member Two Rings 8T_BoCO's Avatar
    Join Date
    Mar 23 2015
    AZ Member #
    322159
    My Garage
    2012 A4 Avant S-Line
    Location
    Colorado

    Just had a similar situation here:

    2012 A5, ~68k miles - rough idle. Oil/Filter change, air filter, fuel filter & plugs replaced just weeks before.
    CEL = P0304 - misfire cylinder 4
    Swap in new coil packs, clear code. Idle appeared better, but then flashing CEL and EPC when aggressive throttle applied.

    Mechanic finds: Checked all ignition systems; found all coils outputting.
    Performed compression waveform analysis on cylinders one and four.
    Found number four has low compression. Performed cylinder leakage test. Found piston rings are not sealing because of fuel wash.
    Injector has failed.

    New #4 injector, all injector seals, carbon-cleaning & oil change needed.

    I suspect my short-trip/failure-to-reach-operating-temp usage pattern, especially in winter, helps to create the ideal conditions for forming carbon in these Direct Injection engines.

    ====
    Update: new injector, but still no compression. They suggest spending $8k on a used engine and I'm wondering why I'd do that for a car worth, maybe $10k? Decisions...
    Last edited by 8T_BoCO; 03-26-2019 at 05:29 PM.
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