94 300i6 loosing spark

Discussion in 'Engine & Performance' started by th3cavalry, Jun 9, 2014.

  1. Jun 9, 2014 at 10:10 PM #1
    th3cavalry

    th3cavalry Junior Member

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    Hi all! I have a wonderful but temperamental truck. I fix one thing and something comes up...

    When the truck warms up it looses spark. Truck just dies. Then won't start again until it sits for a few hours. I can see with an inline spark tester that it doesn't get anything from the coil. I've hooked up a new coil and still no spark. I didn't bolt it down though. Has a new remaned dist and the ICM was tested and is fine. I replaced a blown cap in the PCM.

    I'm not sure what to do next. I do have a multimeter to test with. When it dies and doesn't have spark, I can turn the key to run and you hear the fuel pump cut on for about two seconds then shut off...

    Anybody have any ideas?

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  2. Jun 10, 2014 at 7:38 AM #2
    Roush PSD Interceptor

    Roush PSD Interceptor 7.3L Straight Piped Diesel

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    :welcome: to fordfullsize.com th3cavalry

    Was the ICM warm/hot when testing was done?

    RockAuto has an ICM for less than $20 not including shipping.
    1994 FORD F-150 Ignition Control Module (ICM)

    Other suggestions: Engine Coolant Temperature sensor (ECT) OR Air Charge Temperature sensor (ACT).
    Can you connect an inline fuel pressure gauge an watch it
    when the engine dies to rule in or out an intermittent fuel pump issue?
     
  3. Jun 10, 2014 at 2:09 PM #3
    Pity7700

    Pity7700 oh umm...uhh?

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    welcome!!!!
     
  4. Jun 11, 2014 at 7:32 AM #4
    th3cavalry

    th3cavalry Junior Member

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    It still has fuel pressure, I just replaced pump, tank, sending unit, and other things for a different issue. When the truck has a no spark condition the pumps still run properly. When I cut the key on it runs for about two seconds then stops.

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  5. Jun 11, 2014 at 7:54 AM #5
    Roush PSD Interceptor

    Roush PSD Interceptor 7.3L Straight Piped Diesel

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    I had a neighbor with a chevy 1500 4.3 V6,
    when it gets to operating temp
    the truck would shut off and not start.

    Turns out it was the coolant temp sensor.
    I replaced that and the truck hasn't stopped
    since the repair 15 years ago.

    Not to say this is what is wrong with the
    1994 300 L6, just a suggestion to check.
     
  6. Jun 13, 2014 at 3:15 PM #6
    th3cavalry

    th3cavalry Junior Member

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    1994 F150 300 i6 no spark no injector pulse: http://youtu.be/de_UJt51thA

    I hooked up a NOID light last night and when the truck goes into a no spark condition and also get a no injector pulse condition also. The distributor is about 2 months old and its a remaned but not a Cardone one.

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