Audizine - An Automotive Enthusiast Community

Results 1 to 27 of 27
  1. #1
    Active Member Two Rings Zuhlaynuh's Avatar
    Join Date
    Aug 12 2018
    AZ Member #
    424241
    Location
    California

    Spark plug gap on stage 3 2000 Audi S4

    Guest-only advertisement. Register or Log In now!
    To start off, Iíve been having a misfire problem for almost 6 months now. The first thing I did was replace the spark plugs. I originally bought the NGK Iridium spark plugs, but later I switched to the NGK7REís (and gapped them at .28) because I continued to get misfires. After still receiving misfire codes, I replaced the coil packs that were misfiring (5th & 6th cylinder). The misfires continued to happen so I did a compression test and all cylinders tested okay. The most recent modification I did was install an 034 Motorsport ICM delete kit as well as C5 RS6 coils to connect them to. My main question is what my spark plugs should be gapped at with the RS6 coils since Iím still gapped at .28 and Iím still getting misfires. But Iím open to any other suggestions or opinions on what I need to do get these damn misfires to stop.
    Thank you!!!


    Sent from my iPhone using Audizine

  2. #2
    Registered Member One Ring
    Join Date
    Dec 04 2016
    AZ Member #
    387487
    Location
    WA

    .26 IIRC....

  3. #3
    Senior Member Four Rings VinnysS4's Avatar
    Join Date
    Nov 12 2015
    AZ Member #
    364349
    Location
    Oregon

    What has all been done to the engine? The misfires could be fuel related (injectors) or maybe something else. What do your fuel trims look like while it misfires?

    Sent from my SM-N920V using Tapatalk
    1997 VW GTI VR6 (sold), 2003 Audi RS6 (sold), 2010 Audi A4 2.0T (RIP Totaled on 11/2/2015 ) 2005.5 Audi S4

    My build log
    http://www.audizine.com/forum/showth...-s-s4-timeline

    Texpoops "Correct, but a half inch difference isnít going to accelerate wear by much. Iím sure the front dips that much with a fatty in the front"

  4. #4
    Veteran Member Four Rings CELison's Avatar
    Join Date
    Feb 23 2010
    AZ Member #
    55053
    Location
    Lehigh Valley

    well itís .028, not .28. Thatís what I run on my R8 coils. No issues.

  5. #5
    Senior Member Four Rings cjt671's Avatar
    Join Date
    Dec 14 2014
    AZ Member #
    302887
    My Garage
    B5 S4, B6 A4
    Location
    PNW

    Try platinum ngk plugs prf7q


    Sent from my iPhone using Tapatalk

  6. #6
    Established Member Three Rings Teck09's Avatar
    Join Date
    May 11 2017
    AZ Member #
    399307
    Location
    WA

    After you replaced coils did the misfires stay on the same cylinders? If so I would suspect a wiring issue. You mention the 034 ICM delete kit so I am assuming you also used their coil adapter conversion kit? If not and you did the cut/crimp splice method I would look there. There are several older threads dealing with various misfire issues when converting to the 2.0 coils and if IIRC it is usually ground related.

  7. #7
    Active Member Two Rings Zuhlaynuh's Avatar
    Join Date
    Aug 12 2018
    AZ Member #
    424241
    Location
    California

    Quote Originally Posted by VinnysS4 View Post
    What has all been done to the engine? The misfires could be fuel related (injectors) or maybe something else. What do your fuel trims look like while it misfires?

    Sent from my SM-N920V using Tapatalk
    Engine wise itís pretty stock other than the stage 3 tune, Bosch 52lb injectors (that have been in for a while) and the upgraded Frankenturbos. I havenít checked fuel trim, but I can find a shop who can read fuel trims and data log the car when going WOT.


    Zelanna

  8. #8
    Veteran Member Four Rings blitz2190's Avatar
    Join Date
    Jul 31 2014
    AZ Member #
    269656
    My Garage
    2004 A4 1.8T Quattro, 2.7T swap Stage 3 APR 6 speed
    Location
    NH

    does it misfire under load? at idle? also as mentioned how were the new coils wired?
    Never argue with an idiot, they'll bring you down to their level and beat you with experience.
    2.7T Swap Wiring Guide (Psst this is a link)
    New Build In progress built 2.7 STK 2004 B6 A4- Thread and pic to come

  9. #9
    Active Member Two Rings Zuhlaynuh's Avatar
    Join Date
    Aug 12 2018
    AZ Member #
    424241
    Location
    California

    Quote Originally Posted by CELison View Post
    well itís .028, not .28. Thatís what I run on my R8 coils. No issues.
    Yes, itís currently gapped at .028. The only reason Iím asking is because on 034 Motorsports website, it says the two main reasons people do the ICM delete is to get rid of the misfire but also so they can gap their spark plugs wider.


    Zelanna

  10. #10
    Active Member Two Rings Zuhlaynuh's Avatar
    Join Date
    Aug 12 2018
    AZ Member #
    424241
    Location
    California

    Quote Originally Posted by cjt671 View Post
    Try platinum ngk plugs prf7q


    Sent from my iPhone using Tapatalk
    What should those be gapped at? With my RS6 coils and stage 3.


    Zelanna

  11. #11
    Active Member Two Rings Zuhlaynuh's Avatar
    Join Date
    Aug 12 2018
    AZ Member #
    424241
    Location
    California

    Quote Originally Posted by Teck09 View Post
    After you replaced coils did the misfires stay on the same cylinders? If so I would suspect a wiring issue. You mention the 034 ICM delete kit so I am assuming you also used their coil adapter conversion kit? If not and you did the cut/crimp splice method I would look there. There are several older threads dealing with various misfire issues when converting to the 2.0 coils and if IIRC it is usually ground related.
    No, the misfire actually moved. It was originally switching from all of the cylinders misfiring to just the 6th cylinder. I just installed the ICM delete and new coils yesterday but since then, itís switched to multiple misfire, 2nd misfire and the 5th cylinder misfire. Iíll check again later today and see if any other cylinders start to misfire.
    So I actually bought the RS6 coils because they fit directly onto the ICM delete rather than having to use the coil adapter or splice them. I also went with the RS6 just in case the original coils were going out for any reason.


    Zelanna

  12. #12
    Senior Member Two Rings mys4.org's Avatar
    Join Date
    Dec 18 2007
    AZ Member #
    23468
    My Garage
    2013_S4
    Location
    Bothell, WA

    Factory spark gap is. 016 - .024 inches. I wish the .028 gap rumor would die as that is just the gap the most of our plug pre gapped to..
    but it is not recommend.

    That all said with the 2.0 coil conversion I'm am to run .026 and no misfires but I'm not stage 3

    Sent from my SM-G960U using Tapatalk

  13. #13
    Active Member Two Rings Zuhlaynuh's Avatar
    Join Date
    Aug 12 2018
    AZ Member #
    424241
    Location
    California

    Another thing to note, my boost isn't constant either. It shoots up and down when going WOT. It doesn't hold normal boost levels and itís very laggy now.

    Here are a list of my mods if this helps:
    - Custom stage 3 tune
    - Frankenturbo f4h turbos (about 60k on them)
    - Bosch ev14 52lbs injectors
    - 034 bi pipes
    - Vast inlets
    - 034 3in downpipes
    - Awe twin 2 exhaust
    - 034 high flow cats
    - Stern motor and trans mounts
    - Awe drivetrain stabilizer
    - Jhm stage 4 clutch
    - Apikol rear diff mounts
    - Usp metal slave
    - St coilovers
    - H-sport sway bar
    - 034 end links
    - Girodisc 345mm 2 piece rotors
    - Porsche 18z brake calipers
    - 300mm 034 rea brake kit
    - Raxles front axles
    - RS6 coil packs
    - 034 Motorsports ICM delete

  14. #14
    Senior Member Four Rings JustManson's Avatar
    Join Date
    Oct 11 2016
    AZ Member #
    382924
    Location
    Connecticut

    You have multiple issues that could be related.

    Misfires and turbo issues, boost leaks probably.

    Get some logs and show the Boost Requested VS actual for the turbo issue.

    I run my NGKs at .024 and OEM coils with ICMs.





    Sent from my iPhone using Audizine

  15. #15
    Veteran Member Four Rings CELison's Avatar
    Join Date
    Feb 23 2010
    AZ Member #
    55053
    Location
    Lehigh Valley

    Quote Originally Posted by mys4.org View Post
    Factory spark gap is. 016 - .024 inches. I wish the .028 gap rumor would die as that is just the gap the most of our plug pre gapped to..
    but it is not recommend.

    That all said with the 2.0 coil conversion I'm am to run .026 and no misfires but I'm not stage 3

    Sent from my SM-G960U using Tapatalk
    Uhh what? .028 is what is recommended with the setup he has. Thereís nothing ďrumorĒ about it. He doesn't have oem coils and ICMs.

  16. #16
    Active Member Two Rings Zuhlaynuh's Avatar
    Join Date
    Aug 12 2018
    AZ Member #
    424241
    Location
    California

    Spark plug gap on stage 3 2000 Audi S4

    Quote Originally Posted by mys4.org View Post
    Factory spark gap is. 016 - .024 inches. I wish the .028 gap rumor would die as that is just the gap the most of our plug pre gapped to..
    but it is not recommend.

    That all said with the 2.0 coil conversion I'm am to run .026 and no misfires but I'm not stage 3

    Sent from my SM-G960U using Tapatalk
    Oh okay, interesting. I was just thinking Iíd do a wider spark gap since Iím running the ICM delete with the RS6 coils rather than the 2.0 coils.


    Sent from my iPhone using Audizine

  17. #17
    Active Member Two Rings Zuhlaynuh's Avatar
    Join Date
    Aug 12 2018
    AZ Member #
    424241
    Location
    California

    Quote Originally Posted by JustManson View Post
    You have multiple issues that could be related.

    Misfires and turbo issues, boost leaks probably.

    Get some logs and show the Boost Requested VS actual for the turbo issue.

    I run my NGKs at .024 and OEM coils with ICMs.





    Sent from my iPhone using Audizine
    Ahh, okay. Makes sense. Iím going to check where my vacuum is showing on my boost gauge tonight. Maybe I do have a leak somewhere. Iíll look into getting a log to show that as well. Thank you!


    Sent from my iPhone using Audizine

  18. #18
    Veteran Member Four Rings CELison's Avatar
    Join Date
    Feb 23 2010
    AZ Member #
    55053
    Location
    Lehigh Valley

    I don't think your coils or plugs are your issue. Smoke test and boost leak test before messing around with your plug gap. Your boost fluctuation points to another issue you need to find. Do you have a wideband?
    B5 S4- K24s, built bottom end, E85
    B8 S4- GIAC Stage 2
    150cc Chinese Scooter of Doom

  19. #19
    Active Member Two Rings Zuhlaynuh's Avatar
    Join Date
    Aug 12 2018
    AZ Member #
    424241
    Location
    California

    Quote Originally Posted by CELison View Post
    I don't think your coils or plugs are your issue. Smoke test and boost leak test before messing around with your plug gap. Your boost fluctuation points to another issue you need to find. Do you have a wideband?
    Okay, Iíll do a smoke and leak test before anything. Thank you!
    No, I do not have a wideband.


    Sent from my iPhone using Audizine

  20. #20
    Veteran Member Four Rings CELison's Avatar
    Join Date
    Feb 23 2010
    AZ Member #
    55053
    Location
    Lehigh Valley

    If you plan on keep the car for a while I highly highly reccomend you invest in one. Itís saved my engine multiple times.

  21. #21
    Senior Member Four Rings JustManson's Avatar
    Join Date
    Oct 11 2016
    AZ Member #
    382924
    Location
    Connecticut

    I recommend the AEM x-series digital wideband. Very easy to install and at a $199 or less itís a very Sound investment.

    Must have as said.


    Sent from my iPhone using Audizine

  22. #22
    Active Member Two Rings Zuhlaynuh's Avatar
    Join Date
    Aug 12 2018
    AZ Member #
    424241
    Location
    California

    Quote Originally Posted by CELison View Post
    If you plan on keep the car for a while I highly highly reccomend you invest in one. Itís saved my engine multiple times.
    Oh wow, okay Iíll definitely look into that! Thank you for the advice!


    Sent from my iPhone using Audizine

  23. #23
    Active Member Two Rings Zuhlaynuh's Avatar
    Join Date
    Aug 12 2018
    AZ Member #
    424241
    Location
    California

    Quote Originally Posted by JustManson View Post
    I recommend the AEM x-series digital wideband. Very easy to install and at a $199 or less itís a very Sound investment.

    Must have as said.


    Sent from my iPhone using Audizine
    Okay cool, Iíll look into that one then. Thanks!


    Sent from my iPhone using Audizine

  24. #24
    Veteran Member Three Rings PwrWgn's Avatar
    Join Date
    Sep 14 2013
    AZ Member #
    123136
    Location
    Seattle

    I have had good success with PFR7Qs at ~.028

  25. #25
    Active Member Two Rings Zuhlaynuh's Avatar
    Join Date
    Aug 12 2018
    AZ Member #
    424241
    Location
    California

    Another update:
    Checked vacuum levels and according to my boost gauge, they are normal.
    Checked engine codes again and now Iím back to multiple misfire, cylinder 2 misfire, cylinder 5 misfire and cylinder 6 misfire.


    Sent from my iPhone using Audizine

  26. #26
    Veteran Member Four Rings CELison's Avatar
    Join Date
    Feb 23 2010
    AZ Member #
    55053
    Location
    Lehigh Valley

    You need to do an actual smoke test and an actual pressure test. Are your misfires during cruising, at idle, in boost?
    B5 S4- K24s, built bottom end, E85
    B8 S4- GIAC Stage 2
    150cc Chinese Scooter of Doom

  27. #27
    Active Member Two Rings Zuhlaynuh's Avatar
    Join Date
    Aug 12 2018
    AZ Member #
    424241
    Location
    California

    Quote Originally Posted by CELison View Post
    You need to do an actual smoke test and an actual pressure test. Are your misfires during cruising, at idle, in boost?
    Yeah, Iím gonna do that soon. Honestly, itís very very rarely that I actually feel the misfire. Most the time my check engine light just comes on for a misfire I didnít even feel anything. Very rarely Iíll feel a misfire as Iím accelerating/boosting. The only thing I notice often is occasional boost lag.


    Sent from my iPhone using Audizine



Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  


    © 2001-2018 Audizine, Audizine.com, and Driverzines.com
    Audizine is an independently owned and operated automotive enthusiast community and news website.
    Audi and the Audi logo(s) are copyright/trademark Audi AG. Audizine is not endorsed by or affiliated with Audi AG.