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Thread: LSx Cranks & Runs For A Second

  1. #1

    Default LSx Cranks & Runs For A Second

    I have an LSx 402, 234° in./236° ex./115° LSA cam, FAST 102 with a NW 102 TB, Holley 160 lb/hr injectors, all stock sensors except ZR1 3 bar MAP sensor, GT4788 turbo. All fuel lines are -10, fuel pressure regulator set to 50 psi. Car cranks & starts for a second, then stalls. Used the turbo LSx base calibration and configured it. I also did a system log, no idea how to post them on here. I have checked all wiring a few times, including troubleshooting voltages. Any ideas would be appreciated.

  2. #2
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    Quote Originally Posted by ghost-1 View Post
    Car cranks & starts for a second, then stalls.
    http://forums.holley.com/showthread....5760#post45760 (Scroll down to "Typical No-Start Checks".)
    http://forums.holley.com/showthread....ents-Read-This! (Initial Checks & Adjustments - Read This!)

    I also did a system log, no idea how to post them on here.
    Is the crank or cam sensor signal flatlined? Does the engine stall due to an excessively
    lean or rich AFR condition? You may have to also record a regular datalog. RPM Errors?
    http://forums.holley.com/showthread....s-amp-Datalogs (Datalog & System Log Information)
    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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    No, they look correct to me. Cam is square, crank is like a knife.

  4. #4
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    Quote Originally Posted by ghost-1 View Post
    No, they look correct to me. Cam is square, crank is like a knife.
    You mean the crank sensor is a straight line? Which "LSx" engine is this (LS1, LS2, LS3, LS6, LS7)? 24x, 58x crank reluctor? 1x or 4x cam reluctor?
    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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    Quote Originally Posted by Danny Cabral View Post
    You mean the crank sensor is a straight line? Which "LSx" engine is this (LS1, LS2, LS3, LS6, LS7)? 24x, 58x crank reluctor? 1x or 4x cam reluctor?
    It's an LS1, 24x crank, 1x cam. The crank sensor raises to a peak, then comes down, it does this in between cam events.

    tune

    http://www.filedropper.com/turbolsx402ci4788

    datalog
    http://www.filedropper.com/02260957
    Last edited by ghost-1; 02-26-2016 at 01:20 PM.

  6. #6
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    Quote Originally Posted by ghost-1 View Post
    The crank sensor raises to a peak, then comes down, it does this in between cam events.
    Post the picture again, with "Crank" & "Cam" check marked, and uncheck "Cam A/D".
    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.

  7. #7

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    Definitely looks different:


  8. #8
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    Quote Originally Posted by ghost-1 View Post
    Definitely looks different:
    OK, the crank & cam signals look fine.
    Since it starts, then immediately stalls; does the engine stall due to an excessively lean or rich AFR condition? You may have to also record a regular datalog.
    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.

  9. #9

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    If I remember correctly, it was 13 AFR while cranking, and 11 AFR when it fires, then stalls. I will go do another datalog to confirm, as I did not see one saved.

  10. #10
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    Quote Originally Posted by ghost-1 View Post
    If I remember correctly, it was 13 AFR while cranking, and 11 AFR when it fires, then stalls.
    It's possible the Base Fuel Table is too lean. To determine this, turn the ignition key on, wait for the WBO2 sensor to display AFR, then start the engine. Is the engine stalling due to an excessively rich or lean AFR condition? Also, ensure the Switched +12V red/white wire is powered in the "Run" and "Crank" key positions.
    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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