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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. B8.5 oil in drivers air box

    Started by Tummyshirt162, 02-26-2025 08:20 PM
    • Replies: 0
    • Views: 156
    Tummyshirt162
    02-26-2025, 08:20 PM Go to last post

  2. Unhappy 4.2 v8 Misfire in Cylinder Four

    Started by Happypopda, 02-04-2025 06:33 AM
    • Replies: 0
    • Views: 527
    Happypopda
    02-04-2025, 06:33 AM Go to last post

  3. S5 4.2 v8 water/meth injection for carbon?

    Started by Zingrox, 10-02-2017 06:46 PM
    • Replies: 25
    • Views: 11,889
    Schoona
    01-30-2025, 11:39 PM Go to last post

  4. Optimum Mileage Interval for Spark plug changes on V8 B6/B7, 55K mi seems too long.

    Started by WileyBrill, 11-30-2012 01:27 PM
    • Replies: 7
    • Views: 7,532
    WileyBrill
    12-26-2024, 01:47 PM Go to last post

  5. Flapper delete

    Started by Bhannah510, 09-16-2024 06:36 PM
    • Replies: 0
    • Views: 1,512
    Bhannah510
    09-16-2024, 06:36 PM Go to last post

  6. So Many JHM Supercharged Vehicles for Sale

    Started by wahpao, 02-24-2017 08:39 AM
    • Replies: 7
    • Views: 8,271
    RunninReds
    08-14-2024, 03:34 PM Go to last post

  7. Looking for good tutorial on removing the intake manifold on a B7 S4.

    Started by oleosanxez, 06-02-2024 11:31 PM
    intake manifold, manifold spacers
    • Replies: 0
    • Views: 1,934
    oleosanxez
    06-02-2024, 11:31 PM Go to last post

  8. Throttle Body Not Calibrating-S4 B7

    Started by Mar'd, 03-31-2023 10:37 AM
    • Replies: 2
    • Views: 2,499
    Mar'd
    05-14-2024, 07:33 AM Go to last post

  9. RS4 B8 Random Cold Start Issue (P000D/A - P0175/P0172 [232])

    Started by Totender7, 05-02-2024 08:45 AM
    • Replies: 0
    • Views: 1,090
    Totender7
    05-02-2024, 08:45 AM Go to last post

  10. C7.5 S7 Suspension not adjust in different drive modes

    Started by SirBreezy, 04-22-2024 10:01 PM
    • Replies: 0
    • Views: 973
    SirBreezy
    04-22-2024, 10:01 PM Go to last post

  11. 4.2 FSI (BAR) Oil leak

    Started by mithril, 02-06-2024 07:51 PM
    1 Attachment(s)
    • Replies: 0
    • Views: 895
    mithril
    02-06-2024, 07:51 PM Go to last post

  12. Resets of Oil Life program after oil changes - not working - Why?

    Started by WileyBrill, 01-25-2024 06:48 AM
    • Replies: 0
    • Views: 828
    WileyBrill
    01-25-2024, 06:48 AM Go to last post

  13. Need help with cylinder head bvj vs bar

    Started by Fattyneff, 01-07-2024 09:44 AM
    q7 4.2 bar bvj
    • Replies: 0
    • Views: 1,119
    Fattyneff
    01-07-2024, 09:44 AM Go to last post

  14. Exclamation Rs4 throttle body faults g69/g188 limp mode help!!

    Started by 1FastS4.Com, 04-28-2017 05:12 PM
    • Replies: 2
    • Views: 4,018
    audirari
    12-28-2023, 10:35 PM Go to last post

  15. New 4.2fsi long block from Audi

    Started by Mugelloblu42, 02-06-2023 09:29 AM
    • Replies: 1
    • Views: 2,681
    Bordom
    10-23-2023, 07:59 AM Go to last post

  16. Audi s5 b8 09 v8

    Started by Shabayaba, 09-26-2023 06:51 AM
    audi s5 b8 v8
    • Replies: 0
    • Views: 805
    Shabayaba
    09-26-2023, 06:51 AM Go to last post

  17. Camshafts rotating after removing locking tools

    Started by bferrell130, 04-21-2023 11:22 AM
    • Replies: 0
    • Views: 1,321
    bferrell130
    04-21-2023, 11:22 AM Go to last post

  18. Needing a Audi / RS4 Mechanic / Tech

    Started by Dzicch, 04-11-2023 04:50 PM
    • Replies: 0
    • Views: 1,145
    Dzicch
    04-11-2023, 04:50 PM Go to last post

  19. Ported JHM head noise--valve guides too short?

    Started by Andrew J, 03-12-2022 10:57 AM
    • Replies: 2
    • Views: 2,429
    DR.Death
    03-26-2023, 05:34 AM Go to last post

  20. ABZ V8 as a stand alone. Which wires do I need?

    Started by DR.Death, 03-25-2023 10:38 PM
    • Replies: 0
    • Views: 1,431
    DR.Death
    03-25-2023, 10:38 PM Go to last post

  21. No Crank no start , b6 s4

    Started by Rcryan7, 03-07-2023 11:20 AM
    1 Attachment(s)
    • Replies: 1
    • Views: 1,293
    oripaamoni
    03-16-2023, 09:22 AM Go to last post

  22. BAD BHF ENGINE REPLACED WITH BNK A6 4.2 ENGINE - NOW GETTING LIMP MODE / CAM CODES

    Started by derek76757, 03-02-2023 01:25 PM
    • Replies: 0
    • Views: 2,405
    derek76757
    03-02-2023, 01:25 PM Go to last post

  23. 2011 S5 4.2 cyl 1 misfire

    Started by Jaymehaze, 09-30-2020 08:35 AM
    1 Attachment(s)
    • Replies: 4
    • Views: 3,679
    philbegas
    11-18-2022, 07:01 AM Go to last post

  24. BNS repair manual??

    Started by Mugelloblu42, 01-24-2022 08:06 PM
    • Replies: 1
    • Views: 2,623
    WEC
    10-24-2022, 01:39 PM Go to last post

  25. What exactly is "active" about the factory active motor mounts (B6 S4)?

    Started by BigBrownDog, 03-28-2015 07:13 PM
    • Replies: 5
    • Views: 16,410
    Zolli
    10-17-2022, 04:38 PM Go to last post

  26. 4.2 intake flapper issue

    Started by B76767, 10-13-2022 08:26 AM
    • Replies: 1
    • Views: 2,202
    Zolli
    10-17-2022, 12:30 PM Go to last post

  27. RS7 exhaust

    Started by JpRS7, 10-10-2022 04:54 AM
    exhaust
    • Replies: 0
    • Views: 1,531
    JpRS7
    10-10-2022, 04:55 AM Go to last post

  28. B6 S4 Tune unknown!

    Started by jamboravr6, 09-05-2022 07:39 PM
    • Replies: 0
    • Views: 1,765
    jamboravr6
    09-05-2022, 07:39 PM Go to last post

  29. Touareg 4.2 AXQ timing belt screw up?

    Started by rickyw59, 06-20-2022 03:24 PM
    • Replies: 1
    • Views: 3,137
    rickyw59
    07-04-2022, 06:52 PM Go to last post

  30. Can't find this vacuum leak...

    Started by motionvega, 04-29-2022 08:42 PM
    • Replies: 0
    • Views: 2,410
    motionvega
    04-29-2022, 08:42 PM Go to last post

  31. 40V Swap - 987.1 Cayman SCHOOL ME HERE

    Started by bkwrzdub, 03-30-2022 10:34 AM
    • Replies: 3
    • Views: 6,739
    bkwrzdub
    04-12-2022, 09:14 AM Go to last post

  32. B6 S4; time for timing service?

    Started by Hydr0, 01-16-2022 09:03 AM
    2 Attachment(s)
    • Replies: 0
    • Views: 2,856
    Hydr0
    01-16-2022, 09:03 AM Go to last post

  33. B6 B7 Throttle body measurements needed!

    Started by Cgaines98, 12-10-2021 05:25 PM
    • Replies: 0
    • Views: 2,301
    Cgaines98
    12-10-2021, 05:25 PM Go to last post

  34. Misfire bank 1

    Started by Slicknick97, 10-21-2021 01:24 PM
    • Replies: 1
    • Views: 2,599
    Rol-co
    11-30-2021, 07:15 AM Go to last post

  35. Audi S5 V8 4.2l (CAUA): fuel return line

    Started by Silv3r, 01-06-2019 10:50 AM
    • Replies: 5
    • Views: 15,607
    dymx
    10-12-2021, 10:12 AM Go to last post

  36. What plug/sensor is this??

    Started by NickDee, 08-27-2021 07:50 AM
    • Replies: 0
    • Views: 2,362
    NickDee
    08-27-2021, 07:50 AM Go to last post

  37. 2005 Audi S4 P0345 Camshaft Position Sensor

    Started by B7818, 06-29-2021 10:12 AM
    1 Attachment(s)
    • Replies: 0
    • Views: 3,334
    B7818
    06-29-2021, 10:12 AM Go to last post

  38. Question 4.2L O2 Sensor Codes. Easy fix?

    Started by Squenz, 05-08-2021 08:47 AM
    p2006, p2007, p2198
    • Replies: 0
    • Views: 2,757
    Squenz
    05-08-2021, 08:47 AM Go to last post

  39. Oil in spark plug wells

    Started by VdubB6, 04-29-2021 05:42 PM
    • Replies: 0
    • Views: 2,668
    VdubB6
    04-29-2021, 05:42 PM Go to last post

  40. Piston to wall clearance?

    Started by Nogi B6 S4, 12-15-2020 09:57 PM
    • Replies: 1
    • Views: 4,622
    q_dubz
    03-24-2021, 05:29 AM Go to last post

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