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Missfire, coilpack change now down on power

Discussion in 'A3/S3 Forum (8L Chassis)' started by Timmc, Jul 7, 2008.

  1. Timmc
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    Timmc Member

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    [Jul 7, 2008]
    Just popped up the shops and on the way back the car developed a miss fire. Anyway Mr AA man came out, plugged the laptop in a there was a missfire on number 3 so changed the coil pack which sorted it. Paid the money and off I went, but now it seems down on power. Anyone got any ideas?

    By the way it's an AUM
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  3. Timmc
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    [Jul 7, 2008]
    Changed the plugs but mde no difference, noticed that the emission control warning symbol appears, flashes a few times then goes but still nothing.

    Could my cat be buggered or a sensor?
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  4. Defratos
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    Defratos YouÂ’re Dethpicable!!

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    [Jul 8, 2008]
    Humm I had the same issue a few weeks after remap, but I drove mine for like 20 miles with it knacked. I changed all 4 coil packs and now it feels fine, it did flood the cat with unburnt petrol which left a little deep exhaust note and a smell for a few days. I'd say check your other Spark plugs, if you have Vag com it'll help a million times (thats how I sorted mine out)
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  5. Timmc
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    [Jul 8, 2008]
    Wow, thanks someone replied.

    The emission control warning light is on all the time now, and the ESP ligh is on from start up and wont switch off, so don't want to drive it, trying to get a mate round with vagcom or off to the garage it goes
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  6. NHN
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    [Jul 8, 2008]
    ye wondering if its thrown a fault in vag that needs clearing to right the car, just an idea, but seems weird cause changing the coilpack shouldnt do that, double check the loom wiring plugs into the coilpacks are firmly in place they can be a **** sometimes, but vag would help I beleive.

    Could be a faulty coilpack aswell from audi, its not unknown, unlikely but not impossible.
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  7. Timmc
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    [Jul 8, 2008]
    Someone told me that a dodgy temp sensor could also cause the light to come on.

    It idles fine but when you drive it and go to put some power down its just not there
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  8. NHN
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    [Jul 8, 2008]
    limp mode maybe cause of the faults, vag 1st & might just be a controller code needs clearing
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  9. themanthatcan
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    themanthatcan Member VCDS Map User

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    [Jul 8, 2008]
    I'd replace all 4 coil packs just for piece of mind matey. Sounds like you may still have a dodgy one
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  10. Timmc
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    [Jul 8, 2008]
    Would having a dodgy coil pack still cause the emission light to be on?
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  11. Timmc
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    [Jul 8, 2008]
    Couldn't get anyone with vagcom round so off to a VW/Audi specialist in the morning to hopefully be sorted.

    Was wondering if having it remapped may have caused these problems
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  12. h100vw
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    [Jul 9, 2008]
    A misfiring coil pack would mean unburnt fuel in the exhaust which the lambda probes would pick up. If the ECU couldn't correct the issue. by leaning out the mixture, it would likely put the light on when it got to the end of it leaning out ability.

    No chance the remap has done this IMO.

    Remaps often highlight control items like coilpacks and MAFs that were marginal before. I had a coilpack go within 24 hours on a Leon Cupra. I bought 4 packs but only replaced the dead one. I still have 3 in the shed, which I brought to Australia!!

    Gavin
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  13. Timmc
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    [Jul 9, 2008]
    It's gone to the garage now, so i'll have to wait and see what they come up with
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  14. Timmc
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    [Jul 9, 2008]
    All sorted, the MAF was buggered so that was replaced and the coil pack the AA man put in was also faulty so that was also replaced, goes alright again now. I shall be ringing the AA tomorow to see if I can get my money back on the coil pack.
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