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Thread: No spark, no start.

  1. #1

    Default No spark, no start.

    Engine is a 750 HP Pontiac 535. I'm not getting consistent spark and have been unable to crank my engine after installing the HP EFI. I connected the coil wire to a spark plug testing tool and connected the other side to a ground on the engine. I have video of a spark plug tester showing the coil firing for about 8 seconds one time before quitting while the engine was still cranking, and the next two times it fired exactly once during the entire time the engine was cranking. I have at least 12 volts even when cranking according to the Holley sensors. Batteries are located in the rear. I have two Odyssey 1650s in parallel to ensure plenty of reserve.

    Here's what I have already tested.
    Holley HP ECU power & ground are connected directly to the battery terminals.
    MSD 6AL2 power and ground are connected directly to the battery terminal.
    Holley HP ECU responds and has HEFI file properly loaded.
    TPS reset has been done numerous times successfully. I reset it every time I change anything in HEFI file.
    HEFI file has correct settings for Holley Dual Sync Distributor
    White wire from MSD box is connected to the Points/Dist white wire from the Holley ECU.
    MSD box has been tested by disconnecting the white wire from the ECU and touching it to ground.
    It creates a spark every time it is touched to ground. It has been reconnected to the Holley ECU.
    Fuel pressure is a steady 60 psi at the regulator port.

    Videos of the two cranking attempts is located here:
    https://www.icloud.com/attachment/?u...e%3D1539181337
    I've run System Logs and have a consistent cam signal, crank signal, batter power.
    The Dual Sync is setup as custom as outlined by Holley and the white points wire has been run to the MSD box.
    Last edited by DOUG62; 09-11-2018 at 10:18 PM.

  2. #2

    Default

    At this point, I'm pretty sure the white points wire from the Holley ECU is not grounding the white wire from the MSD box, as it needs to do in order to make it fire. The wire has power to it from the MSD box, so a ground signal is needed to trigger the MSD box. I'm leaning towards the ECU needing a better ground somewhere. I know it has the main ground back at the battery and the ground for the relay, but I wonder if I'm missing a ground somewhere or need to relocate the main ground closer to the chassis?

  3. #3
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    18,654

    Default

    How are your Custom Ignition Parameters programmed?

    Originally Posted by Danny Cabral
    The Custom Ignition Parameters (in System Parameters) for the Holley EFI Dual Sync Distributor:
    Ignition Type ............. ― "Custom"
    Crank Sensor Type ..... ― "1 Pulse/Fire"
    Sensor Type .............. ― "Digital Falling"
    Inductive Delay .......... ― "100.0 usec" ( Synchronization info, adjusted per application.)
    Ignition Reference Angle ― "50°" ( Inherent rotor-phasing of this unit.)
    Cam Sensor Type ........ ― "Single Pulse" ( "Not Used" for TBI, unless CNP ignition.)
    Sensor Type .............. ― "Digital Falling"
    Output Setup Type ..... ― "Points Output" ( CDI box ground trigger.)
    Dwell Time ................. ― "2.0 msec" ( Do not set this to 1.5 msec!)
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

  4. #4

    Default

    They are set exactly as above. I can send my System Log files along with my HEFI file, if you would like to see them.

    Now attached thanks to the advice from 81TA.09111350.zip
    Last edited by DOUG62; 09-12-2018 at 09:05 AM.

  5. #5
    Join Date
    Nov 2014
    Location
    Ont. Canada
    Posts
    830

    Default

    You need to zip the files.

  6. #6

    Default

    Thanks 81TA. I'm running a Trans Am here as well. I have zipped them and attached to the previous post.

    Should there be any other grounds other than the primary ground to the battery and the ground for the fuel pump relay? Those are connected. Trying to figure out why the ground signal through the white wire is not happening consistently. Could a ground just not be strong enough? How do you test the white wire from the Holley ECU? I've tested it from the MSD box and that tested fine. I need some way of determining if that white wire is pulsing a ground signal as it should.
    Last edited by DOUG62; 09-12-2018 at 09:12 AM.

  7. #7
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    18,654

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    Quote Originally Posted by DOUG62 View Post
    Should there be any other grounds other than the primary ground to the battery and the ground for the fuel pump relay?
    Not on distributor ignition applications.
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

  8. #8

    Default

    Tried relocating the ground. Same stuff. Timing light flashed like crazy for about 20 seconds. Next time about 2 seconds. After that with each crank Nothing. I have the injector harness and fuel pump relay pulled now, because the smell of raw gas was getting too strong. I just donÂ’t understand why such a strong flash when itÂ’s been sitting and then the sudden stop. I have a older Crane Hi-6 ignition box I can wire in place of the MSD 6AL2. IÂ’ll need to dig up a wiring diagram for it, but it operates the same way as I recall.

    Are the datalogs available now? If not, I can send them some other way.

  9. #9
    Join Date
    Nov 2014
    Location
    Ont. Canada
    Posts
    830

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    In your System Logs, you're losing crank signal. You have a good cam signal, but the crank signal is falling out. You'll get a crank signal, then it syncs and sparks for a little, then is looses crank signal and then it comes back and has to sync again. I would look at the crank signal pickup first.

  10. #10

    Default

    What could cause this? I'm running a brand new Holley Dual Sync distributor and the HP system is brand new as well. How would I check the pickup in that? On another note, what engine are you running in your TA?
    Last edited by DOUG62; 09-12-2018 at 07:26 PM.

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