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1994 model year gas engine trucks use a different ignition system, Computer Controlled Dwell (CCD), versus the 1993 and earlier model years (Push-Start Ignition). There are wiring differences between the two. I would stick with a 1993 or slightly earlier PCM.
Why does my search for replacements have so many different part numbers? Like 2 Cardones have different listing. Were there different ECUs for XLT vs ... ?
Way more than 2 ECM's, different trans, different motor, even Lightning XLT's, were different, ECM's, I think they called it updates??? within the same yesar model, even F250/350, had different ECM's, it just goes on........and on.
1994 model year gas engine trucks use a different ignition system, Computer Controlled Dwell (CCD), versus the 1993 and earlier model years (Push-Start Ignition). There are wiring differences between the two. I would stick with a 1993 or slightly earlier PCM.
This topic came up several years ago - can't find the thread now - but I thought that the consensus was that you CAN run a CCD PCM on a earlier ('87 - '93) truck without concern. My first-hand experience is that this is true. I've run several PCM's over the years on my '91 and currently I'm running one from a '95 truck with no apparent difference from the earlier ones I've run. Obviously running one from a '96/7 truck is a whole different ballgame since those run EEC-V / OBD2.
A CCD programmed computer will run the earlier ignition system, but it may not be 100%. The computer is trying to control the dwell via the ICM while the Push-Start ICM is trying to do it on it's own. If it works for you, great. Cannot say every combination will. My best advice is if you are sourcing an alternative PCM, try to match up as many variables as possible to avoid headaches.
My best advice is if you are sourcing an alternative PCM, try to match up as many variables as possible to avoid headaches.
I absolutely agree with you on this. It's especially true when you're trouble-shooting and the previous owner has thrown questionable parts into the mix. First thing I want to do in those scenarios is return everything as close as possible to factory original.
In my case I've found that the circuit boards on the '94/5 PCM's seem to be built to a higher quality and are less prone to leaky capacitors that the '87 - '93 PCM's are notorious for. So for me, it's a solution that works.
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