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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. B7 4.2 V8 Factory A/C Compressor RPM

    Started by WileyBrill, 03-22-2025 08:36 AM
    • Replies: 0
    • Views: 1,620
    WileyBrill
    03-22-2025, 08:36 AM Go to last post

  2. B8.5 oil in drivers air box

    Started by Tummyshirt162, 02-26-2025 08:20 PM
    • Replies: 0
    • Views: 198
    Tummyshirt162
    02-26-2025, 08:20 PM Go to last post

  3. Unhappy 4.2 v8 Misfire in Cylinder Four

    Started by Happypopda, 02-04-2025 06:33 AM
    • Replies: 0
    • Views: 593
    Happypopda
    02-04-2025, 06:33 AM Go to last post

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

    Started by Zingrox, 10-02-2017 06:46 PM
    • Replies: 25
    • Views: 11,973
    Schoona
    01-30-2025, 11:39 PM Go to last post

  5. 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: 7,651
    WileyBrill
    12-26-2024, 01:47 PM Go to last post

  6. Flapper delete

    Started by Bhannah510, 09-16-2024 06:36 PM
    • Replies: 0
    • Views: 1,557
    Bhannah510
    09-16-2024, 06:36 PM Go to last post

  7. So Many JHM Supercharged Vehicles for Sale

    Started by wahpao, 02-24-2017 08:39 AM
    • Replies: 7
    • Views: 8,345
    RunninReds
    08-14-2024, 03:34 PM Go to last post

  8. 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: 2,577
    oleosanxez
    06-02-2024, 11:31 PM Go to last post

  9. Throttle Body Not Calibrating-S4 B7

    Started by Mar'd, 03-31-2023 10:37 AM
    • Replies: 2
    • Views: 2,655
    Mar'd
    05-14-2024, 07:33 AM Go to last post

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

    Started by Totender7, 05-02-2024 08:45 AM
    • Replies: 0
    • Views: 1,108
    Totender7
    05-02-2024, 08:45 AM Go to last post

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

    Started by SirBreezy, 04-22-2024 10:01 PM
    • Replies: 0
    • Views: 1,002
    SirBreezy
    04-22-2024, 10:01 PM Go to last post

  12. 4.2 FSI (BAR) Oil leak

    Started by mithril, 02-06-2024 07:51 PM
    1 Attachment(s)
    • Replies: 0
    • Views: 939
    mithril
    02-06-2024, 07:51 PM Go to last post

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

    Started by WileyBrill, 01-25-2024 06:48 AM
    • Replies: 0
    • Views: 870
    WileyBrill
    01-25-2024, 06:48 AM Go to last post

  14. 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: 1,146
    Fattyneff
    01-07-2024, 09:44 AM Go to last post

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

    Started by 1FastS4.Com, 04-28-2017 05:12 PM
    • Replies: 2
    • Views: 4,100
    audirari
    12-28-2023, 10:35 PM Go to last post

  16. New 4.2fsi long block from Audi

    Started by Mugelloblu42, 02-06-2023 09:29 AM
    • Replies: 1
    • Views: 2,732
    Bordom
    10-23-2023, 07:59 AM Go to last post

  17. Audi s5 b8 09 v8

    Started by Shabayaba, 09-26-2023 06:51 AM
    audi s5 b8 v8
    • Replies: 0
    • Views: 853
    Shabayaba
    09-26-2023, 06:51 AM Go to last post

  18. Camshafts rotating after removing locking tools

    Started by bferrell130, 04-21-2023 11:22 AM
    • Replies: 0
    • Views: 1,345
    bferrell130
    04-21-2023, 11:22 AM Go to last post

  19. Needing a Audi / RS4 Mechanic / Tech

    Started by Dzicch, 04-11-2023 04:50 PM
    • Replies: 0
    • Views: 1,176
    Dzicch
    04-11-2023, 04:50 PM Go to last post

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

    Started by Andrew J, 03-12-2022 10:57 AM
    • Replies: 2
    • Views: 2,462
    DR.Death
    03-26-2023, 05:34 AM Go to last post

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

    Started by DR.Death, 03-25-2023 10:38 PM
    • Replies: 0
    • Views: 1,507
    DR.Death
    03-25-2023, 10:38 PM Go to last post

  22. No Crank no start , b6 s4

    Started by Rcryan7, 03-07-2023 11:20 AM
    1 Attachment(s)
    • Replies: 1
    • Views: 1,322
    oripaamoni
    03-16-2023, 09:22 AM Go to last post

  23. 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: 2,502
    derek76757
    03-02-2023, 01:25 PM Go to last post

  24. 2011 S5 4.2 cyl 1 misfire

    Started by Jaymehaze, 09-30-2020 08:35 AM
    1 Attachment(s)
    • Replies: 4
    • Views: 3,702
    philbegas
    11-18-2022, 07:01 AM Go to last post

  25. BNS repair manual??

    Started by Mugelloblu42, 01-24-2022 08:06 PM
    • Replies: 1
    • Views: 2,646
    WEC
    10-24-2022, 01:39 PM Go to last post

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

    Started by BigBrownDog, 03-28-2015 07:13 PM
    • Replies: 5
    • Views: 16,605
    Zolli
    10-17-2022, 04:38 PM Go to last post

  27. 4.2 intake flapper issue

    Started by B76767, 10-13-2022 08:26 AM
    • Replies: 1
    • Views: 2,229
    Zolli
    10-17-2022, 12:30 PM Go to last post

  28. RS7 exhaust

    Started by JpRS7, 10-10-2022 04:54 AM
    exhaust
    • Replies: 0
    • Views: 1,552
    JpRS7
    10-10-2022, 04:55 AM Go to last post

  29. B6 S4 Tune unknown!

    Started by jamboravr6, 09-05-2022 07:39 PM
    • Replies: 0
    • Views: 1,826
    jamboravr6
    09-05-2022, 07:39 PM Go to last post

  30. Touareg 4.2 AXQ timing belt screw up?

    Started by rickyw59, 06-20-2022 03:24 PM
    • Replies: 1
    • Views: 3,176
    rickyw59
    07-04-2022, 06:52 PM Go to last post

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

    Started by motionvega, 04-29-2022 08:42 PM
    • Replies: 0
    • Views: 2,440
    motionvega
    04-29-2022, 08:42 PM Go to last post

  32. 40V Swap - 987.1 Cayman SCHOOL ME HERE

    Started by bkwrzdub, 03-30-2022 10:34 AM
    • Replies: 3
    • Views: 6,827
    bkwrzdub
    04-12-2022, 09:14 AM Go to last post

  33. B6 S4; time for timing service?

    Started by Hydr0, 01-16-2022 09:03 AM
    2 Attachment(s)
    • Replies: 0
    • Views: 2,871
    Hydr0
    01-16-2022, 09:03 AM Go to last post

  34. B6 B7 Throttle body measurements needed!

    Started by Cgaines98, 12-10-2021 05:25 PM
    • Replies: 0
    • Views: 2,351
    Cgaines98
    12-10-2021, 05:25 PM Go to last post

  35. Misfire bank 1

    Started by Slicknick97, 10-21-2021 01:24 PM
    • Replies: 1
    • Views: 2,622
    Rol-co
    11-30-2021, 07:15 AM Go to last post

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

    Started by Silv3r, 01-06-2019 10:50 AM
    • Replies: 5
    • Views: 15,961
    dymx
    10-12-2021, 10:12 AM Go to last post

  37. What plug/sensor is this??

    Started by NickDee, 08-27-2021 07:50 AM
    • Replies: 0
    • Views: 2,385
    NickDee
    08-27-2021, 07:50 AM Go to last post

  38. 2005 Audi S4 P0345 Camshaft Position Sensor

    Started by B7818, 06-29-2021 10:12 AM
    1 Attachment(s)
    • Replies: 0
    • Views: 3,364
    B7818
    06-29-2021, 10:12 AM Go to last post

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

    Started by Squenz, 05-08-2021 08:47 AM
    p2006, p2007, p2198
    • Replies: 0
    • Views: 2,795
    Squenz
    05-08-2021, 08:47 AM Go to last post

  40. Oil in spark plug wells

    Started by VdubB6, 04-29-2021 05:42 PM
    • Replies: 0
    • Views: 2,703
    VdubB6
    04-29-2021, 05:42 PM Go to last post

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