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No spark or ODBII port connection after motor swap

Discussion in '2001-2005 Explorer Sport Trac' started by Thadigus, August 13, 2017.


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    1. Thadigus

      Thadigus Member

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      City, State:
      Goshen, IN
      Year, Model & Trim Level:
      2001 Explorer Sport Trac
      Hey guys, in June I created a thread for my problem and it just kind of died and I also feel that I didn't have enough knowledge about the problem. But now I know more and I'd like to figure this out this time.

      I did a motor swap this summer, for my 2001 st and once I got the whole thing together it doesn't start. After further inspection I have come to the conclusion that I'm getting fuel (injectors are firing and getting their power so that must mean the computer is working) but I'm not getting spark. I hear all the time that that can be caused by cam and/or crank sensors not working but I've hooked up continuity testers to them and they seem to be fine (they fluctuate in resistance when the engine turns when I crank it) so I wanted to make sure they were okay so I figured I'd put a ODBII computer to the truck and read the digital tachometer that it produces directly from the computer. But when I plugged the ODBII computer in it doesn't connect. I always get a link error like the ECM isn't working. Which is odd because the injectors are getting power (I connected a test light to the ground on the battery and it shows they're lit up, so I know the ECM is giving them power but isn't willing to connect to the computer, that's my main issue. I know the ECM has power and is operating but I can't connect to it.

      I also did the standard lay the spark plug against the block and I'm not getting spark but I think that has to do with the ECM as well. A local mechanic that is extremely reliable says that he thinks it has to do with a power delivery issue.

      Any questions or suggestions are always welcome and a preemptive thank you to all who take their time to help!
       
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    3. Thadigus

      Thadigus Member

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      City, State:
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      Year, Model & Trim Level:
      2001 Explorer Sport Trac
      ... after deciding to tear into wires and all that I pulled the PCM out for laughs.... and I think I found my problem.... this may not solve the spark issue but I'm almost certain that it's the ODBII problem!

      [​IMG]
       
    4. Thadigus

      Thadigus Member

      Joined:
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      City, State:
      Goshen, IN
      Year, Model & Trim Level:
      2001 Explorer Sport Trac
      Yep that fixed it. Now I just need to work out some kinks in the system
       

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