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Forum: V8 Engine Tech

Technical discussion on all aspects of VAG 4.2 and 5.2 V8 tuning and tech. Sponsored by JH Motorsports.

JH Motorsports

  1. Oil in spark plug wells

    Started by VdubB6, 04-29-2021 05:42 PM
    • Replies: 0
    • Views: 2,719
    VdubB6
    04-29-2021, 05:42 PM Go to last post

  2. Piston to wall clearance?

    Started by Nogi B6 S4, 12-15-2020 09:57 PM
    • Replies: 1
    • Views: 4,653
    q_dubz
    03-24-2021, 05:29 AM Go to last post

  3. Engine sounds like misfire at 58-60 mph

    Started by kmacks27, 12-02-2019 11:48 AM
    • Replies: 1
    • Views: 3,437
    Natebowen3
    03-09-2021, 07:48 AM Go to last post

  4. Angry P0355 AUDI - Ignition Coil 5 Primary/Secondary Circuit

    Started by Natebowen3, 03-05-2021 09:18 AM
    • Replies: 0
    • Views: 3,333
    Natebowen3
    03-05-2021, 09:18 AM Go to last post

  5. Talking 2007 A6 4.2 Strange Mis-fire: Codes included in post and YouTube video! Scrap it?

    Started by sgfreak96, 12-10-2020 06:20 PM
    cel, codes, coils, misfire 3 Attachment(s)
    • Replies: 13
    • Views: 5,623
    Fisher1
    02-07-2021, 11:43 PM Go to last post

  6. S4 4.2L nightmare

    Started by A4Sleeper28, 12-07-2020 06:22 PM
    1 Attachment(s)
    • Replies: 3
    • Views: 4,557
    A4Sleeper28
    12-24-2020, 05:58 AM Go to last post

  7. 4.2l 05 S4

    Started by AllWheelDeath, 12-13-2020 03:42 PM
    • Replies: 1
    • Views: 2,916
    gavmatt1978
    12-24-2020, 01:19 AM Go to last post

  8. 2011 S5 intake manifold failure

    Started by Jaymehaze, 09-30-2020 08:39 AM
    1 Attachment(s)
    • Replies: 1
    • Views: 2,579
    A4Sleeper28
    12-08-2020, 05:18 PM Go to last post

  9. Audi S5 8T 4.2l V8: Fuel injectors cleaner

    Started by Silv3r, 01-01-2019 03:19 PM
    • Replies: 4
    • Views: 7,308
    iselinzilla
    03-25-2020, 07:58 AM Go to last post

  10. This is from the new PLASTIC intake manifold design with vac system..

    Started by No2sc2, 03-07-2020 08:31 AM
    3 Attachment(s)
    • Replies: 0
    • Views: 2,967
    No2sc2
    03-07-2020, 08:31 AM Go to last post

  11. 2004 S4 Vacuum Line Help

    Started by JaS3113, 01-01-2020 09:49 AM
    3 Attachment(s)
    • Replies: 1
    • Views: 2,796
    JaS3113
    01-01-2020, 11:01 PM Go to last post

  12. Engine sounds like misfire at 58-60 mph

    Started by kmacks27, 12-02-2019 11:47 AM
    • Replies: 0
    • Views: 2,254
    kmacks27
    12-02-2019, 11:47 AM Go to last post

  13. 2012 S5 4.2 stalling when stopping Plz Help

    Started by BkAlbo, 06-10-2019 03:59 PM
    • Replies: 1
    • Views: 2,992
    ChachBoi
    10-03-2019, 06:59 AM Go to last post

  14. Does anyone know what type of sensor this is?

    Started by Mycah, 09-22-2019 02:15 PM
    1 Attachment(s)
    • Replies: 1
    • Views: 2,601
    itsmatt33
    09-23-2019, 01:14 PM Go to last post

  15. 05 4.2 A6 / No Power / P0341 P0300 Cam Position & Misfire Codes

    Started by U_know_me, 07-25-2019 07:12 PM
    • Replies: 0
    • Views: 3,335
    U_know_me
    07-25-2019, 07:12 PM Go to last post

  16. ECU Swap question_4.2 V8 swap

    Started by monkslayer, 07-09-2019 03:43 AM
    • Replies: 0
    • Views: 3,674
    monkslayer
    07-09-2019, 03:43 AM Go to last post

  17. Recommendations

    Started by ShaneB, 03-04-2019 10:19 PM
    oem; s5; v8;
    • Replies: 4
    • Views: 4,012
    4wheelsmaniac
    07-08-2019, 02:45 AM Go to last post

  18. Built internals on B8 4.2L V8 + boost?

    Started by Benzo1133, 05-14-2018 07:40 AM
    • Replies: 9
    • Views: 17,902
    George Town
    05-03-2019, 04:56 AM Go to last post

  19. B7 s4 running rich-help

    Started by Koopsdeville, 07-25-2016 11:30 AM
    • Replies: 3
    • Views: 4,476
    Bailster
    04-16-2019, 09:11 AM Go to last post

  20. DYI Leak Down Tester

    Started by MG_Motorsports, 03-22-2019 06:56 AM
    4.2l v8, audi s4, cheap, diy, leakdown test
    • Replies: 0
    • Views: 2,548
    MG_Motorsports
    03-22-2019, 06:56 AM Go to last post

  21. DIY Coolant drain and flush, RS4/S4 (4.2L)

    Started by frmomiller, 06-28-2014 07:48 AM
    • Replies: 3
    • Views: 20,333
    deekim781
    02-16-2019, 04:19 AM Go to last post

  22. Coolant bleeding

    Started by deekim781, 02-15-2019 01:11 PM
    • Replies: 0
    • Views: 1,901
    deekim781
    02-15-2019, 01:11 PM Go to last post

  23. Rebuild complete

    Started by JS4Avant, 09-21-2017 06:24 AM
    • Replies: 14
    • Views: 5,979
    Bordom
    01-07-2019, 10:14 AM Go to last post

  24. Carbon Clean Out

    Started by Indy Mike, 12-28-2018 08:31 AM
    • Replies: 1
    • Views: 2,584
    Indy Mike
    12-29-2018, 07:32 AM Go to last post

  25. 4.2 S5 oil light ( oil level full please reduce oil) need help!

    Started by SFCRCOOP, 05-15-2014 06:56 PM
    • Replies: 6
    • Views: 12,635
    DraiS5
    12-19-2018, 07:43 PM Go to last post

  26. Electric Cam adjuster solenoid

    Started by sonosam, 08-28-2017 07:02 PM
    • Replies: 1
    • Views: 2,851
    ZimbutheMonkey
    10-16-2018, 10:44 PM Go to last post

  27. B7 S4 Performance Build Help

    Started by VDUBB7S4, 11-11-2017 08:29 AM
    • Replies: 1
    • Views: 3,109
    ZimbutheMonkey
    10-16-2018, 10:42 PM Go to last post

  28. Random Misfires and P2293 (n276)

    Started by Alu, 09-08-2018 03:46 PM
    • Replies: 2
    • Views: 2,449
    Black 17
    10-15-2018, 07:50 PM Go to last post

  29. Are cam tensioners/guides still a common failure point for 2011 S5 V8 4.2?

    Started by volvofan, 10-07-2018 05:34 AM
    • Replies: 0
    • Views: 1,649
    volvofan
    10-07-2018, 05:34 AM Go to last post

  30. Question 4.2L cylinders 5, 6, 7, and 8 misfiring help please

    Started by Detroit, 12-05-2016 08:57 PM
    • Replies: 11
    • Views: 18,610
    volvofan
    10-07-2018, 05:23 AM Go to last post

  31. Rattle during Acceleration, please help!!! Sound like the knock when you get bad fuel

    Started by James1972, 10-03-2018 06:19 PM
    • Replies: 0
    • Views: 1,337
    James1972
    10-03-2018, 06:19 PM Go to last post

  32. rattle noise in bank one

    Started by tprivratsky35, 04-07-2013 12:26 PM
    • Replies: 1
    • Views: 2,352
    James1972
    10-03-2018, 06:13 PM Go to last post

  33. 2008 Q7 4.2 need help find timing tool kit

    Started by James1972, 07-09-2018 05:27 PM
    2008 4.2 q7 timing 1 Attachment(s)
    • Replies: 1
    • Views: 1,554
    James1972
    07-09-2018, 08:10 PM Go to last post

  34. Electronics fault! ESP light

    Started by Larry_G, 06-03-2018 10:23 AM
    a8 esp fault
    • Replies: 1
    • Views: 2,068
    Larry_G
    06-06-2018, 11:18 AM Go to last post

  35. B7 S4 electrical issues help

    Started by DConf, 06-02-2018 11:16 PM
    s4 v8 audi 4.2l
    • Replies: 0
    • Views: 1,732
    DConf
    06-02-2018, 11:16 PM Go to last post

  36. Are B6 BHF metal valve covers and B7 BHF plastic valve covers interchangeable?

    Started by keithwbloom, 04-14-2016 09:27 AM
    • Replies: 1
    • Views: 2,904
    supak
    04-14-2018, 10:44 AM Go to last post

  37. Exhaust down pipe

    Started by kvzy, 03-09-2017 06:39 PM
    • Replies: 3
    • Views: 2,996
    tjbradney
    04-03-2018, 07:22 PM Go to last post

  38. Rough idle only w/P0174

    Started by Dolphin_S4, 07-25-2016 07:24 PM
    p0174 b6 roughidle
    • Replies: 4
    • Views: 2,851
    MrVern306
    03-18-2018, 12:07 PM Go to last post

  39. B7 S4 Misfiring Please Help!

    Started by B7_S4, 02-28-2017 05:24 PM
    • Replies: 10
    • Views: 6,783
    AudiquattroRS4
    03-13-2018, 01:54 PM Go to last post

  40. Unhappy P2096 Bank 1 running lean

    Started by ChristianMoore, 03-11-2018 02:17 PM
    • Replies: 0
    • Views: 1,776
    ChristianMoore
    03-11-2018, 02:17 PM Go to last post

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