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Thread: 5.4L 4V Timing Change During Crank Issue

  1. #1

    Default 5.4L 4V Timing Change During Crank Issue

    OK so I have a 5.4L 4V Modular engine with HP EFI, LS coils, and Hall-Effect sensors for crank & cam sensors instead of the factory sensors, because I was having crank & cam signal issues with the stock sensors. Now I have a known tune from 5.4L 4V that runs & drives. But when trying to verify timing during cranking, it reads different timing every time the timing light goes. Trying to figure out what the issue is, I have the timing set at 15° for cranking, and when turning over the timing goes from 15° degrees, and will change 80 or more degrees advanced every time the timing light fires off. I have verified the cam timing has been properly setup and have no internal engine issues. Thanks, Dustin Clemens

  2. #2
    Join Date
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    Some timing lights don't work well at cranking speeds. Try another timing light.
    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

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    Tried a different light, timing looks to be correct now with no fluctuations. So now I'm having a no fire situation still. Not sure what could be causing it. I took System Logs to make sure that the crank & cam signals are there, and have taken datalogs also. Nothing looks out of place to me or a few other friends that have & use Holley successfully.

  4. #4
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    TPS Autoset? http://forums.holley.com/showthread....5760#post45760 (Scroll down to "Typical No-Start Checks".)
    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. #5

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    Yes, I did a TPS Autoset. And I've also been through the no-start checklist.

  6. #6

    Default

    Quote Originally Posted by 521stroker57 View Post
    Yes, I did a TPS Autoset. And I've also been through the no-start checklist.
    Post the tune, a System Log and a normal datalog. Without them, everything is just a guess.

  7. #7
    Join Date
    Nov 2013
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    Quote Originally Posted by 521stroker57 View Post
    Tried a different light, timing looks to be correct now with no fluctuations. So now I'm having a no fire situation still. Not sure what could be causing it. I took System Logs to make sure that the crank & cam signals are there, and have taken datalogs also. Nothing looks out of place to me or a few other friends that have & use Holley successfully.
    Have you done a firing order flip? Basically rotating four places.
    Needs to be 6-5-4-8-1-3-2-7 because the stock cam sync is in the wrong spot.
    -Scott
    Don't forget to check out progress on my Race Car:
    Project Blasphemy - 8.07 @ 171
    Low 8 Second Street Car

  8. #8
    Join Date
    Dec 2009
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    I hope so: http://forums.holley.com/showthread....m-Sensor-Setup (Scroll down to "2.3 Special Cases", "Case 1: Ford Modular Setup in Custom Ignition Parameters".)
    http://forums.holley.com/showthread....ing-Holley-EFI (CNP/COP/DIS & single coil/distributor ignition synchronization verification & troubleshooting information at the end of post #1.)
    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.

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