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No Spark on Rebuilt 4.0

Discussion in '2001-2005 Explorer Sport Trac' started by Thadigus, June 15, 2017.

^^Searches ExplorerForum.com^^
  1. Thadigus

    Thadigus Member

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    Howdy, so I've become relatively well versed with the 4.0 SOHC, I ripped one out of my brother's sport trac (2001) and I put it in my sport trac (also 2001). Mine had the very very common timing chain issue where they simply get loose and also my transmission was barely staying into gear on the third and fourth. In fact over drive was pretty much not a thing. So when my brother totaled his truck I decided that was my chance to fix my truck. His timing chains were just barely starting to show the signs of the timing chains going. So I took and rebuilt it and then stuck it to it's transmission (which was golden) and I threw it in my truck. Obviously it's the same model and year so it should pretty much be plug and play. I got it all in and I have compression and fuel at the rail. But it doesn't start. It cranks pretty slow but my dad (an ASC certified mechanic) said he thinks its just because there's no oil and it'll be okay once I get it running and the oil pressure goes to normal, which makes sense to me.

    Here's where the post actually begins.

    My problem is that I have it all together but it doesn't run. It has fuel and compression. But no spark. We laid a spark plug against the block and there is NOTHING for spark. Does anyone know why this would happen? I have everything connected but the alternator (something happened with the three pin connection and I'm working on fixing it. I've stared at wiring diagrams for quite a while and there MIGHT be a problem with that three pin not being connected as far as telling the ignition coil not to go. Do you guys think that might be the problem? Any other suggestions?

    Thanks for all you guys have done for me because you guys have answered questions for me many a time when I rebuilt that 4.0.
     
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  3. Thadigus

    Thadigus Member

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    Update: When I connect a OBDII computer I get a link error like it isn't connected. Could that mean this is a computer problem?
     
  4. sr139fox

    sr139fox Active Member

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    What about the cam an/or crank position sensor? Dave P
     
  5. Thadigus

    Thadigus Member

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    They all seem good to go to my knowledge but yeah I had thought about that because I know the CPU won't let the ignition coil give spark if they aren't good to go, but I'm pretty sure they're okay. What I tried to do was hook up our code reader (which well let you see the rpms in real time on a digital readout) but it wouldn't connect and only gave me a link error. Does that give you any ideas?
     
  6. sr139fox

    sr139fox Active Member

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    Maybe a ground. The grounds are more critical a ST. The sensor might look ok, but could have been damaged in the accident.
     
  7. Thadigus

    Thadigus Member

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    What do you mean by grounds? Like the grounds that tie the engine to the body?
     
  8. Thadigus

    Thadigus Member

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    I just ran out to the garage and put a continuity tester from the block to the battery ground. It's definitely good. Less than an ohm resistance
     
  9. Thadigus

    Thadigus Member

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    Any idea's on how to test if the sensors are good?
     
  10. Mbrooks420

    Mbrooks420 High Voltage. Elite Explorer EF Vendor

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    No flashing theft light?
     
  11. 96firephoenix

    96firephoenix Active Member

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    Check the mounting screws for the Ignition module to battery negative. It sounds like you're not getting power to your ICM.

    Should be integral with the coil pack.
     
  12. Thadigus

    Thadigus Member

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    Nope

    Where is that? How do I check for that?

    Thank you all for the help
     
  13. Thadigus

    Thadigus Member

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    Do you mean the coil pack mounts? If so I'm so sorry I feel so dumb XD we always just called it the coil pack. Just see if the coil pack is getting a good ground?
     
  14. 96firephoenix

    96firephoenix Active Member

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    yea, just talking about the coil pack getting a good ground
     
  15. Thadigus

    Thadigus Member

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    How do I check for that? Volt meter from the hot on the battery to where on the coil pack?
     
  16. 96firephoenix

    96firephoenix Active Member

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    mounting screws
     
  17. Mbrooks420

    Mbrooks420 High Voltage. Elite Explorer EF Vendor

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    Did you pull the computers and related stuff that went with the original motor?
     
  18. Thadigus

    Thadigus Member

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    Not really. I grabbed some small black box out of it that I could find because a family friend suggested the same thing. But I don't believe it's anything like the ecu.
     
  19. Mbrooks420

    Mbrooks420 High Voltage. Elite Explorer EF Vendor

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    Wouldn't the PATS have to match?
     
  20. Thadigus

    Thadigus Member

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    Its the same key and same PATS stuff. It shouldn't be a problem.
     
  21. 96firephoenix

    96firephoenix Active Member

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    I think the PATS and ECU need to be from the same car. is that what you've got?
     






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