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Thread: misfire????

  1. #1
    Senior Member Three Rings mmxruffryder15's Avatar
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    misfire????

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    Driving today and i floored it the car studdered bad and the cel started flashing and then it stopped...car runs fine in normal driving but when i floor it in 2nd 3rd or 4th gear it studders at 3k rpm and runs fine the rest of the rev band but no cel....plugs or coil pack or should i jiat vag it to see where it from exactly

  2. #2
    Senior Member Four Rings RedB5S4's Avatar
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    I'd scan it to see if you have any codes or anything, although that definitely sounds like a misfire issue. I'd try some new plugs, make sure they're gapped correctly, etc. and see if that resolves your issue.

    I'm kind of experiencing the same thing right now, with a hesitation in 2nd and 3rd gear @ 3k RPMs. I haven't replaced my plugs since I got tuned though, so I'm 99% sure that's where my problem is coming from. Sounds like you're having the same issues.
    Stg. III+ K24 CaS4

  3. #3
    Veteran Member Four Rings MDJ's Avatar
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    Aggressive tunes can foul your plugs up pretty quick.

    Get some NGK bkr7e plugs and change them out. Check the codes and then SEARCH. This topic has been covered one million times.

  4. #4
    Stage 3 Forum Advertiser Four Rings ECS Tuning-Audi's Avatar
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    Scan the car for codes first. Definitely sounds like coils or spark plugs. There could also be a boost/vacuum leak.

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  5. #5
    Senior Member Three Rings Avant Fetish's Avatar
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    Quote Originally Posted by mmxruffryder15 View Post
    Driving today and i floored it the car studdered bad and the cel started flashing and then it stopped...car runs fine in normal driving but when i floor it in 2nd 3rd or 4th gear it studders at 3k rpm and runs fine the rest of the rev band but no cel....plugs or coil pack or should i jiat vag it to see where it from exactly
    Sounds like what I'm going through now. Car will shudder under full load and CEL will start blinking. Soon as I hit the gas and the boost jumps above 15psi...the car will start shuddering. If I floor it...car will go into limp. As long as I don't floor it...car runs fine. Vag'd the car and it says I got a misfire in cylinder 5.
    Cup | Corrado | B5 S4 Avant | MK6 Jetta Sportwagen | Cervelo S2
    Four Season Tuning | B5 S4 filler plates

  6. #6
    Veteran Member Four Rings Don Supreme's Avatar
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    Yup plugs are a good place to start. If you are lucky, you won't have to go any further down the rabbit hole that is the B5 S4 misfire.

  7. #7
    Active Member Two Rings
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    Why wouldnt you suggest stock spark plugs? I had similar misfire issues, changed to new stock plugs and it all cleared up. The gap on the stock plugs that were in there, was way out.

  8. #8
    Established Member Two Rings Grayv3's Avatar
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    stock plugs dont have the correct heat range for the higher cylinder pressures. i went through this bs the night before the april show & go when i did a full service on my s4
    anything worth doing right is never easy!

  9. #9
    Senior Member Three Rings mmxruffryder15's Avatar
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    Got the car scanned and the only code was for multiple misfires...bought bosch F5DP0R plugs and they will be going in today...hopefully that solves the problem

  10. #10
    Active Member Two Rings
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    I would agree. The OP made no mention of additional power adders.

  11. #11
    Senior Member Three Rings mmxruffryder15's Avatar
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    Quote Originally Posted by Rocket SLC View Post
    I would agree. The OP made no mention of additional power adders.
    Sorry forgot to mention im stage 2+ with a custom tune

  12. #12
    Active Member Two Rings
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    No worries. I just pulled some Bosch F5DPOR plugs out of a APR stg3 car that 25k on them. They looked great. They should be a good plug for ya.

  13. #13
    Established Member Two Rings ifrazkhan's Avatar
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    I had the exact same problem a little while ago. Was driving on the highway and suddenly the car started sound like a WRX and stuttering and just going no where. I thought something had gone wrong and pulled over, and after going a bit more, it stopped and went back to normal.

    Turns out the coils were gone in one of the cylinders and it was the only cylinder that was misfiring. Didn't cost very much to fix.



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