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Thread: 7AL Engine Unexpectedly Dying Out

  1. #1

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    I have a carburetor 460 Ford in a track only car. All 7 series ignition with the Pro Billet distributor. Worked good like this for more than a year. Lately it dies out unexpectedly while running it in the shop. Fuel system is good, I check for +12V at MSD 7AL box, I check grounds, I check spark at coil, sometimes I get spark and other times not. I tried a different coil to see if it could be a problem, so currently it has a round "Blaster" coil on it. I let it sit for few minutes, start it up, it run for a minute or two and then it just dies, sounds like the ignition just cuts off. How do I go about troubleshooting this? Thanks.

    It seemed to startup better this morning, but acted up again after it's hot. I've read about checking the distributor pickup. I looked online and says to do a resistance check on and voltage check while cranking to diagnose it.

  2. #2
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    Quote Originally Posted by Mark460 View Post
    It seemed to startup better this morning, but acted up again after it's hot.
    Yep, that's usually when a distributor's pickup coil intermittently fails (Ohms resistance test).

    I've read about checking the distributor pickup. I looked online and says to do a resistance check on and voltage check while cranking to diagnose it.
    Read page 2: https://documents.holley.com/techlibrary_pickups.pdf (MSD Magnetic Pickup Testing)
    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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    It failed the resistance check. Shows almost shorted out. This should fix the problem. Thanks!

  4. #4
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    You're welcome.
    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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    I rechecked the resistance and determined I had set my old school analog type of multimeter wrong. It appears to check out within spec. I'm back were I was. I checked the spark under the hood while cranking over the engine, I see it has spark and then after a few revolutions of the engine, the spark quits. Could it be something wrong with the 7AL box? What should I check next.

  6. #6
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    https://www.holley.com/support/troub...ng_techniques/ (MSD Ignition Troubleshooting Techniques)
    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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    With the box, it either works or it doesn't. Call us at 915-857-5200, ext 2254, so we can go over your setup please.
    shake-n-bake

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