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  1. 05-01-2018 06:12 PM #1
    bubba947
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    Strang missfire HELP please

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    Hey guys I'm new here but I own a 07 a6 4.2 s line and I have a strang miss on cylinders 8 and 6 i have a heavy vibration under acceleration and slightly at idle the cel only flashes at idle but if you drive the car and let it get to operating temp and shut the car off and let it sit for a minute or two and restart the miss and vibration goes away can anyone give me advice to what it could be I have a new combi valve in the past week but that didn't help that much thanks guys
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  2. 05-01-2018 06:29 PM #2
    AFONE
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    Sounds similar to an issue that I had recently with my Land Rover. Bad coil.


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  3. 05-01-2018 06:51 PM #3
    bubba947
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    Ya that was gonna be my guess I'm gonna look into those this weekend thanks
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  4. 05-01-2018 06:54 PM #4
    AFONE
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    Strang missfire HELP please

    If you have access to a code reader, see what kinds of codes it’s throwing. That should point you to the right direction. Good luck.

    Please be sure to check back in and let us know how it all turns out.

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  5. 05-01-2018 06:59 PM #5
    bubba947
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    I've plugged vag-com in and it's only giving me the miss on cylinders 8 and 6 and a small evap leak gonna plug back in Friday and let you know exactly what I get
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  6. 05-01-2018 07:03 PM #6
    AFONE
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    Yep; that sounds like a bad coil. You could swap a coil from the other side with one of those and see if the code changes to a different cylinder (trial & error).


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  7. 05-01-2018 07:04 PM #7
    bubba947
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    Okay I'll give that a shot I'll check back in after I do that thanks
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  8. 05-02-2018 05:11 AM #8
    95blkmax
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    exactly what AFONE said! Swap em from the other side and let the whole scenario of the first post replay, and see if the misfire changes position.

    PS- since you're already in there, how old are your spark plugs? If you're coming up on that change, this would be a good time to knock it off the list

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  9. 05-02-2018 07:45 AM #9
    christianb5s4
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    If you have a bad coilpack or two, I recommend replacing them all. If a few are failing I can assure you others are not far behind especially if they're original to the car. Definitely do sparkplugs at the same time like 95blkmax said!
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  10. 05-02-2018 11:26 PM #10
    Grigor@Bestiale
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    Indeed, swapping the coils around is a good way to diagnose them. First for sure is the full scan of the ECU though, helps a ton.


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  12. 05-04-2018 04:38 AM #11
    bubba947
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    Thanks guys gonna do coils plugs are new in the past month when I brought the car they had put 3 new coils on to get rid a miss so I'm just gonna change them all at once
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  13. 05-15-2018 10:16 AM #12
    bubba947
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    Thanks everyone for the help was coil packs and the car runs like new again once again thank you!!!
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  14. 05-20-2018 10:47 PM #13
    Grigor@Bestiale
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    Glad to hear it, enjoy! :-)


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