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Thread: Ran great for an hour, now at No ECU. PLEASE HELP

  1. #1

    Default Ran great for an hour, now at No ECU. PLEASE HELP

    Hello, new to the Sniper world here and been chasing my tail with this for days. Doing nothing, but reading Holley forums, trying, testing and still a no go with my issue. I installed the Sniper early last week. After installation my 383 SBC ran the best it every ran after about a hour of cruising my truck died. I got it started back and made it home holding the gas pedal to the floor and chuggin' along like 800 RPM. So frustrated at this time I called it quits for the day. I went back out the next day and could not get the engine to run at all. I cranked & cranked it would sputter that's it. So I started reading and doing checks. As of now the readout reading is No ECU!
    Fuses tested and good.
    Relay tested and good (even tried a new one).
    Ground is good.
    12.7 volts at ignition hot.
    Unhooked completely for 24 hours.
    Pulled plugs, all fire fine.
    Timing is still the same as was carbed.
    Before No ECU message, had RPM signal 175 at cranking.
    I'm lost and getting frustrated on what else to do. I've tried numerous time to get through to Holley Tech with no luck. Any other suggestions, thoughts, ideas, I'd greatly appreciate it. Thanks.

  2. #2
    Join Date
    Dec 2009


    Have you tried using the Wizard or uploading the Config File again? If it won't allow that, contact Holley Tech Service (LINK). "No ECU" sounds bad. Ensure all wiring is good.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, FRPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 tires.

  3. #3


    Yes, tried loading Wizard files again and get to the end and get ECU Error. Wiring is all good (I hate sloppy wiring). I went through it all last night with a volt meter. I guess I'll have to call Holley Tech and wait on hold for 2-3 hours.

  4. Default

    Some other test steps here: Check over the handheld wiring/CAN plug, etc. Make sure they're not showing signs of damage, burn marks, etc. Check that the handheld is plugged in. Also make sure the handheld is using the latest Sniper firmware on the SD card. Some users have tried the other Holley EFI firmware, which are not compatible. Holley Tech support also has an online tech support and they'll email you back rather then you having to wait on hold.
    1970 XW Fairmont (presented as a GT Falcon Replica), 351 Cleveland with Aussie 302 2V closed chamber heads. Edelbrock F351 2V dual plane intake manifold. Camtech CT21544 (234/238@050", 570/579lift, 2600-6200rpm quoted range, 110lobes) 1.73:1 roller rockers. AOD Transmission. Ford 9" 3.5 Diff ratio. Pacemaker #PH4050 2v Tri-Y extractors to 2.5" Hi Flow V-Tex merge pipe with dual 2.5" exhaust through Hooker Aero Chamber Mufflers. Holley Sniper EFI 4150 Super Sniper 650 with HyperSpark Ignition.

  5. #5


    Sorry, running HEI distributor, so only tach wire hooked up.

  6. #6


    Check for RFI. Make sure yellow wire to HEI and rest of Sniper harness is away from spark plug wires.

  7. #7


    Is the pump running? You have 12 volts from ignition, but if your main 30 amp fuse is blown you'll get no ECU, but the handheld will still come to life.

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