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Thread: Timing light cutting out?

  1. Default Timing light cutting out?

    OK, first let me describe my setup:
    SBF 427 cid Dart block
    Holley Terminator EFI
    Holley CNP smart coils & Dual Sync Distributor for ignition system.

    Ignition Parameters modified per instructions:
    Coils have 4.0 Dwell Time
    Inductive Delay at 100 (Seems to be OK because timing matches what laptop says.)

    Issue: At about 3500 RPM, the timing light flash slows less frequent flashes. Once I reach about 4000 RPM and timing is about 40° BTDC (in idle & park) the timing light goes blank/no flash. I'm only able to diagnose while idling for now, due to some brake issues. Any ideas?

  2. #2
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    23,113

    Default

    If the engine runs fine during this occurrence, try another timing light.

    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 ..... ― "DIS Coil On Plug" (← Holley CNP Smart Coils.)
    Dwell Time ................. ― "4.0-5.0 msec" (← Read end of page 1 - LINK.)
    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. Default

    The only other thing I can add to this, is that when I was testing the brake system by simply moving forward & backward, there seems to be possibly an odd ignition thing going on. Hard to describe. It doesn't seem like a miss, but when accelerating forward, there seems to be a uniform & equal "pitter patter" sound from the ignition. Nothing like a knock or really a misfire. It will still burn the tires, but I can tell it's definitely low on power compared to when the last old school ignition setup was in. But I guess I can't dwell too much on this because like I said, I can't really test it in gear with the lack of brakes. Burning the tires was already a risk LOL, but needed.

    FYI: I'm also using the recommended harnesses from Holley. The coil harness instructions seemed a little odd though. They read as if I should have pretty much cut up the pre-made harness and run different size wires. But wasn't really clear on exactly what to do. Also, the Output Setup type I believe, has several options for the "DIS Coil On Plug". I can't remember what they are, but they're in "" after the name, and instructions don't specify which to use or why?
    Last edited by Cougarbird86; 07-31-2017 at 09:16 AM.

  4. #4
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    23,113

    Default

    Quote Originally Posted by Danny Cabral
    Ignition Timing Cylinder Sequence Verification
    Ensure the Firing Order is entered correctly in Ignition Parameters (System ICF).
    Before the initial start, disconnect the fuel injector harness and verify
    at least, the first four cylinders in the firing order using a timing light.
    If your cylinders are firing in 90° intervals BUT in the wrong sequence,
    the coil harness is connected wrong (at the ECU or at the coil packs).
    Hopefully you have a fully degreed balancer or at least markings every 90°:
    1st cylinder, in firing order, should fire at 0° (or 15° - add whatever your cranking timing is)
    2nd cylinder, in firing order, should fire at 270° (or 285° - cranking timing added)
    3rd cylinder, in firing order, should fire at 180° (or 195° - cranking timing added)
    4th cylinder, in firing order, should fire at 90° (or 105° - cranking timing added)
    5th cylinder, in firing order, should fire at 0° (or 15° - cranking timing added)
    6th cylinder, in firing order, should fire at 270° (or 285° - cranking timing added)
    7th cylinder, in firing order, should fire at 180° (or 195° - cranking timing added)
    8th cylinder, in firing order, should fire at 90° (or 105° - cranking timing added)
    http://forums.holley.com/showthread....ing-Holley-EFI (Ignition Timing Synchronization)
    CNP/COP/DIS & single coil/distributor ignition synchronization verification & troubleshooting information at the end of post #1.

    EFI Software Help Information/Instructions:
    ‒ On the top Toolbar, click "Help" & "Contents". This opens all Help topics.
    ‒ When navigating the software, click "Help ?", drag it to any parameter and click again.
    ..This automatically opens the definitions for that specific parameter.
    ‒ Tuning information can be read by clicking the F1 key, when you're viewing any screen.
    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.

  5. Default

    Interesting thank you. But if this was the case, it would cause a bad misfire and a poor running engine correct? Because the engine happens to run near perfect at idle, with excellent values on all sensors. I may just be crying wolf. I will try another timing light before I get too far ahead of myself.
    1986 Ford Thunderbird: Custom ROUSH 427 SBF/DART SHP Big Bore Block, AFR Heads, Holley Terminator EFI, Holley Smart Coils, custom valve cover coil bracket.
    "T-birds are like the red headed step son of the Fox body family...but we still love 'em the same."

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