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Thread: Holley HP EFI help needed - BACKFIRE

  1. #41
    Administrator David Hodgkins's Avatar
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    Quote Originally Posted by bobl View Post
    Timing shows to be around 25 in the timing table and on the dash display. I can't tell from the data log snapshot. If you want, email me the datalogs you have and I'll study them. I don't normally run near that much timing at idle but if it ran good before then I would be looking elsewhere for a problem. [email protected]
    That's what I'm thinking. Should be around 10 - 11 degrees, right? I didn't get to the shop last night, so no timing light done.

    I'll send you the log, thanks.


    FFR 5369 Pin Drive, IRS, Trigos, Torsen, Wilwoods, FMS BOSS 302 "B" cam , Mass-flo. CA SB100 (SPCN) Registered
    Delivered 4/23/06. "Finished" 4/2012 (still not done!)


  2. #42
    bobl's Avatar
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    Somewhere in that range. Just have to figure out what works best. You will need to have a gradual ramp up in timing as map and rpm increase or it will be jerky to drive.

    Quote Originally Posted by David Hodgkins View Post
    That's what I'm thinking. Should be around 10 - 11 degrees, right? I didn't get to the shop last night, so no timing light done.

    I'll send you the log, thanks.

    Mk IV Roadster, 347/516 HP, 8 stack injection, Astro Performance T5, 3-Link 3.55 gears, Purchased 08/2015, Graduated 02/2017

  3. #43
    Itchief's Avatar
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    David

    Did you resolve your backfire issues
    #8475 Complete Kit Delivered Nov 2014, started Nov 2015, Street Legal Apr 2016, Paint and Interior Completed Aug 2017, 390 BBF, March accessory kit, MSD Atomic EFI and Ready to run, TKO 500 with MidShift kit, hooker headers, 3 link, track lock with 3.55, sway bars, power steering, wipers, heater

  4. #44
    Administrator David Hodgkins's Avatar
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    Quote Originally Posted by Itchief View Post
    David

    Did you resolve your backfire issues
    No I haven't. I have some log files I need to send to someone to interpret. Checking with Holley...

    FFR 5369 Pin Drive, IRS, Trigos, Torsen, Wilwoods, FMS BOSS 302 "B" cam , Mass-flo. CA SB100 (SPCN) Registered
    Delivered 4/23/06. "Finished" 4/2012 (still not done!)


  5. #45
    Administrator David Hodgkins's Avatar
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    Zipped log files attached. Backfire data should be included since it happened while logging...
    Attached Files Attached Files

    FFR 5369 Pin Drive, IRS, Trigos, Torsen, Wilwoods, FMS BOSS 302 "B" cam , Mass-flo. CA SB100 (SPCN) Registered
    Delivered 4/23/06. "Finished" 4/2012 (still not done!)


  6. #46
    Itchief's Avatar
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    Did you have the backfire issue before you changed the spark plugs
    #8475 Complete Kit Delivered Nov 2014, started Nov 2015, Street Legal Apr 2016, Paint and Interior Completed Aug 2017, 390 BBF, March accessory kit, MSD Atomic EFI and Ready to run, TKO 500 with MidShift kit, hooker headers, 3 link, track lock with 3.55, sway bars, power steering, wipers, heater

  7. #47
    Administrator David Hodgkins's Avatar
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    Quote Originally Posted by Itchief View Post
    Did you have the backfire issue before you changed the spark plugs
    Yes sir.

    FFR 5369 Pin Drive, IRS, Trigos, Torsen, Wilwoods, FMS BOSS 302 "B" cam , Mass-flo. CA SB100 (SPCN) Registered
    Delivered 4/23/06. "Finished" 4/2012 (still not done!)


  8. #48
    Itchief's Avatar
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    Ok

    Just a thought if you have a dual plane intake and one of the injectors is not closing properly and is dumping too much fuel into the intake would that cause the backfire issue

    Do the new plugs on that side look wet after running the motor

    Good luck

    Rick
    #8475 Complete Kit Delivered Nov 2014, started Nov 2015, Street Legal Apr 2016, Paint and Interior Completed Aug 2017, 390 BBF, March accessory kit, MSD Atomic EFI and Ready to run, TKO 500 with MidShift kit, hooker headers, 3 link, track lock with 3.55, sway bars, power steering, wipers, heater

  9. #49
    Administrator David Hodgkins's Avatar
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    Thanks for the thought Rick!

    I'll pull the driver's side plugs after running it for a bit and I'll take a look.


    FFR 5369 Pin Drive, IRS, Trigos, Torsen, Wilwoods, FMS BOSS 302 "B" cam , Mass-flo. CA SB100 (SPCN) Registered
    Delivered 4/23/06. "Finished" 4/2012 (still not done!)


  10. #50
    Itchief's Avatar
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    The excess fuel may also explain the spark plug fouling
    #8475 Complete Kit Delivered Nov 2014, started Nov 2015, Street Legal Apr 2016, Paint and Interior Completed Aug 2017, 390 BBF, March accessory kit, MSD Atomic EFI and Ready to run, TKO 500 with MidShift kit, hooker headers, 3 link, track lock with 3.55, sway bars, power steering, wipers, heater

  11. #51
    Member G_Hodgkins's Avatar
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    Glad to see you decided to fix this, it's only been like a year!

  12. #52
    Administrator David Hodgkins's Avatar
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    Quote Originally Posted by G_Hodgkins View Post
    Glad to see you decided to fix this, it's only been like a year!
    Hey YOU! Back to work!

    consin fraggin friggle frumpllll conis flaglll grrrrrrrrrr.....

    FFR 5369 Pin Drive, IRS, Trigos, Torsen, Wilwoods, FMS BOSS 302 "B" cam , Mass-flo. CA SB100 (SPCN) Registered
    Delivered 4/23/06. "Finished" 4/2012 (still not done!)


  13. #53
    Senior Member Clover's Avatar
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    Quote Originally Posted by G_Hodgkins View Post
    Glad to see you decided to fix this, it's only been like a year!
    Ha Ha! You may have left the house but your sarcasm remains. Good sons always needle their fathers.

  14. #54
    Senior Member Clover's Avatar
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    Oops double post. Karma I guess.
    Last edited by Clover; 06-14-2018 at 11:53 AM.

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