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Tips For Starting Up A Rebuilt Engine With Sniper Efi

Discussion in 'Early CJ5 and CJ6 Tech' started by truckee4x4, Oct 9, 2021.

  1. Feb 27, 2022
    Norcal69

    Norcal69 Out of the box thinker 2022 Sponsor 2021 Sponsor 2020 Sponsor

    Northern California
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    Your making this way too hard still….
    I welded key stock to bolts and I have nearly 10k miles on it now…..
     
    supertrooper and 45es like this.
  2. Mar 3, 2022
    truckee4x4

    truckee4x4 Grant Kaye 2022 Sponsor 2021 Sponsor 2020 Sponsor

    Truckee CA
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    After work last night I pulled the fuel pump relay and cranked the engine over and was hoping to verify that my crank trigger wheel/sensor were producing RPM signal, but no luck (I think...)

    Here's what I have:
    1. Ignition type set to CD Box in Software.
    2. Purple IGN + wire from main harness connected to sensor white wire on Holley Hall-Effect sensor.
    3. Ground wire from sensor to battery (verified continuity).
    4. Red wire from Sensor to IGN switched 12V.
    5. 0.040" gap verified at sensor to trigger wheel.
    6. 3 teeth on trigger wheel at 120°.

    Here's a pic of the sensor and trigger wheel:
    A8EF315D-AAA5-4FCE-8CA7-B7A31C41967C.jpeg
    I connected a scope-meter and videoed it while cranking, here's a screenshot:
    C1B76D09-CB77-493D-8175-0B9B765B4C39.jpeg
    The sensor is clearly producing a signal, but the RPM needle on the Sniper handheld screen did not budge.

    Here's a screenshot of the Sniper handheld config screen:
    A6F3A901-BB46-4266-8F9E-F4C96FD47FDA.jpeg
    I have a datalog, and when I open it in the Sniper PC software there's no sign of any RPM signal.

    here’s the wiring directions:
    3D77ACC4-93ED-429C-A786-CF74AFA92453.jpeg

    What am I missing?
     
  3. Mar 3, 2022
    Jw60

    Jw60 WRPD855 2022 Sponsor 2021 Sponsor 2020 Sponsor

    Sedalia MO.
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    Do you have a 4pin hei module and incandescent test light available?
    If the 4pin is compatible with the pickup your test light should flash on the coil side of the hei.
    It's been a long while but that's how I ran the Toyota pickup in the failed omix 4cyl dizzy.
     
  4. Mar 3, 2022
    truckee4x4

    truckee4x4 Grant Kaye 2022 Sponsor 2021 Sponsor 2020 Sponsor

    Truckee CA
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    I do not.

    In re-reading the directions, I wonder if I made a stupid boneheaded move and didn't cycle the power on/off to reset the configuration in the ECU.

    Also - What voltage should a battery provide while cranking? This one was going down to 10.4, and I wonder if maybe having it on a charger in a cold garage all winter has degraded it.
     
  5. Mar 3, 2022
    45es

    45es Member 2021 Sponsor 2020 Sponsor

    Naches, WA
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    Show us a complete wiring diagram of your EFI and ignition systems. Need to see how you integrated the sensor signal to MSD box and Sniper EFI.
     
    truckee4x4 likes this.
  6. Mar 3, 2022
    truckee4x4

    truckee4x4 Grant Kaye 2022 Sponsor 2021 Sponsor 2020 Sponsor

    Truckee CA
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    Will do.

    I had a moment while my car was warming up on the way to work, I reran the configuration wizard, power cycled the ignition for the directions, fired it up on the initial start up screen, and the RPM signal came through!

    this weekend I will add some gas, replace the fuel pump relay, and try to fire it up for real.
     
    Jw60, SFaulken and Fireball like this.
  7. Mar 3, 2022
    zinertia2

    zinertia2 "and which part are you keeping?" 2022 Sponsor 2021 Sponsor 2020 Sponsor

    Greencastle , IN
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    Grant
    Sounds like great progress!!
    Dennis
     
  8. Mar 3, 2022
    truckee4x4

    truckee4x4 Grant Kaye 2022 Sponsor 2021 Sponsor 2020 Sponsor

    Truckee CA
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    This is how it is currently wired.

    TBD if I will switch the Sensor Ground lead to the Green Crank Signal Negative in the Violet/Green twisted pair or leave it going to the battery (-). Per Holley tech support the battery is fine.
    1966-Jeep-CJ5A-Holley-Sniper-Wiring-Diagram_v1.jpg
     
    Last edited: Mar 3, 2022
  9. Mar 12, 2022
    truckee4x4

    truckee4x4 Grant Kaye 2022 Sponsor 2021 Sponsor 2020 Sponsor

    Truckee CA
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    Update: fired her up and re-adjusted the timing and all systems nominal! Here’s a video:

    https://share.icloud.com/photos/052FKDhOfQq_CHmRv9eSSaGCw
    (Let me know if this iCloud video from my phone works)

    Next steps are fine tuning and, when I get seats, cautious neighborhood driving.
     
  10. Mar 12, 2022
    GillaFunk

    GillaFunk I'm the Dude, so thats what you call me. 2022 Sponsor

    Graeagle Calif...
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    Congratulations dude. That’s awesome
     
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  11. Mar 12, 2022
    truckee4x4

    truckee4x4 Grant Kaye 2022 Sponsor 2021 Sponsor 2020 Sponsor

    Truckee CA
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    Cheers thanks! Looking forward to when you can come to visit.

    We tweaked AFR and acceleration fuel multiplier and some other settings a bit and revved it as well, all was normal. Set the idle a little higher than the FSM says, ended up at 750/800 where it sounded the best to the ear.

    We recorded a bunch of data logs for further analysis, will report back tomorrow if anyone’s curious.
     
    Fireball likes this.
  12. Mar 13, 2022
    zinertia2

    zinertia2 "and which part are you keeping?" 2022 Sponsor 2021 Sponsor 2020 Sponsor

    Greencastle , IN
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    Grant
    Excellent!!!!
    Dennis
     
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  13. Mar 13, 2022
    Kevin Shipman

    Kevin Shipman New Member

    Woodstown, NJ
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    Sounds great. Now you just need to reproduce those so I can buy one. Wanting to get a sniper for my rebuild. Something else I came across, has anyone thought of using a Dakota Digital flywheel sensor to get the RPM. I was looking at their gauges to use and came across their tach signal interface. It looks like a stand a lone unit. Might be another option.

    https://www.dakotadigital.com/index...id=1192/category_id=694/mode=prod/prd1192.htm
     
  14. Mar 14, 2022
    Norcal69

    Norcal69 Out of the box thinker 2022 Sponsor 2021 Sponsor 2020 Sponsor

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    There is no need to reinvent the wheel..... literally!
    Just mount a crank sensor that reads a 3 toothed wheel or put 3 bolts through the balancer and move along.
     
  15. Mar 14, 2022
    Buildflycrash

    Buildflycrash The pride of Cucamonga 2022 Sponsor 2020 Sponsor

    Gulf Breeze FL...
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    That sounds great! Did you run a 20min Break-in with high RPM? How did that all go?
     
  16. Mar 14, 2022
    truckee4x4

    truckee4x4 Grant Kaye 2022 Sponsor 2021 Sponsor 2020 Sponsor

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    Yeah I did that initially a few months ago per the engine builders instructions. That went fine, except that the Sniper was struggling with the irregular RPM signal from the distributor, which is why I made the trigger wheel.

    As @Norcal69 pointed out, the 3-toothed steel wheel is not necessary, but I enjoyed the exercise of inventing and making it and it seems to have solved the problem.
    051F888F-247E-4EFB-A39C-3131B8264104.jpeg

    I did make trigger bolts like he did but I wasn’t convinced that they were not going to come loose and rotate overtime.

    As he has pointed out several times before he’s got 10,000 miles on his setup and his trigger bolts still work so looks I was just being paranoid. Anyway, what I did worked and I'm happy with it.
     
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  17. Mar 16, 2022
    Norcal69

    Norcal69 Out of the box thinker 2022 Sponsor 2021 Sponsor 2020 Sponsor

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    Next time I'm under the jeep I'll throw a wrench on them for your peace of mind. I used lock washers and red loctite when I installed them.
    Those trigger bolts you made are nice BTW.... Betcha could sell those for $20 in the classified section!
     
  18. Mar 18, 2022
    truckee4x4

    truckee4x4 Grant Kaye 2022 Sponsor 2021 Sponsor 2020 Sponsor

    Truckee CA
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    What do you have your idle set to?
     
  19. Mar 18, 2022
    Lockman

    Lockman OK.....Now I Get It . 2022 Sponsor 2021 Sponsor 2020 Sponsor

    White City, NY 14617
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    Really sounds cherry there, Grant :clap:
     
    Last edited: Mar 19, 2022
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  20. Mar 18, 2022
    Norcal69

    Norcal69 Out of the box thinker 2022 Sponsor 2021 Sponsor 2020 Sponsor

    Northern California
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    My chip idle is set to 600 rpm.
    It’s in the 600-700 rpm range once thermostat opens.
     
    Lockman likes this.
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