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Thread: bad misfire

  1. 04-09-2008 08:18 AM #1
    dubiraq05
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    bad misfire

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    well i got in my car yesterday started it up and began to drive. it was misfireing like crazy so i put some new plugs in and gapped to .028 and still have the misfire issue..... where do i go from here..... i have 1yr old maf sensor and icm.... the car will run fine until around 15 psi of boost then it sounds like i have a jack hammer under my hood....lol any help would be great

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  2. 04-09-2008 08:29 AM #2
    mark_2328
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    Re: bad misfire

    I'm having the same problem, only with stock Ko3s. Just replaced icm not too long ago. If I go over like 3/4 throttle it just bogs down like crazy. Help us out guys!
    2000 S4, Autothority chip, H&R Sways, basically stock..
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  3. 04-09-2008 08:41 AM #3
    AudiSportB5S4
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    Re: bad misfire

    i had tons of misfiring problems, coilpacks, coolant temp sensor, leaky injector seals, boost leaks/vacuum leaks. any codes ?
    Current: B9.5 SQ5 | Past: C7.5 S6, B5 S4, C7.5 A6, 8V A3, B8 A4, B5 A4 | Videos
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  4. 04-09-2008 08:42 AM #4
    AudiSportB5S4
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    Re: bad misfire

    edit, i didnt have all those problems LOL just saying check those, mine turned out to be coil packs, 2 of them were fried so just replaced them all!
    Current: B9.5 SQ5 | Past: C7.5 S6, B5 S4, C7.5 A6, 8V A3, B8 A4, B5 A4 | Videos
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  5. 04-10-2008 08:18 AM #5
    dubiraq05
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    Re: bad misfire

    i have replaced all the coil packs already about a yr ago. never replaced the boots tho i might try that
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  6. 04-10-2008 09:57 AM #6
    Seerlah
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    Re: bad misfire

    I remember a person whom had his gap specs. Thatwhen he set the gap to .030" he was free from misfires. Worth a try. I do not recall his set up though. He would misifre at the recommended .028 and it stopped when he gapped to .030".
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  7. 04-10-2008 01:21 PM #7
    AudiRacerS4
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    Re: bad misfire

    i changed my plugs today and gapped them at .032 and the car feels much smoother, when i had them gapped at .028 i got a slight misfire at WOT every now and then. you may want to check the connectors and wires as well they crack sometimes due to heat
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  8. 04-10-2008 02:07 PM #8
    Militant-Grunt
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    Re: bad misfire

    Could be a bad coil pack if you replaced maf / icm. Get the car vagged.
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  9. 04-10-2008 02:42 PM #9
    Stampy
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    Re: bad misfire

    I would check out the wires going into the coilpacks. Those crack open sometimes. Usually not on Audi's though cause VAG gave us Rubber protection boots. VW 1.8t's Just get exposed wires. Hahahah, cost cutting
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  10. 04-10-2008 10:09 PM #10
    mark_2328
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    Re: bad misfire

    Wouldn't a bad coil cause the car to misfire/bog down all the time? Not just under boost?
    2000 S4, Autothority chip, H&R Sways, basically stock..
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