Originally Posted by powersportcomposites
I bought a 99 7.3 with "bad pcm". Upon more investigation (still waiting to get my hands on a confirmed good PCM (one Napa sent is not giving me a WTS light, but the old "bad" one does give wts light). Can't get it to start for anything, even with ether (i know its a no no). I pulled the oil fill cap off and had a buddy crank it. It's shooting A LOT of air put of there. Like a good solid puff on every cylinder. Is it safe to assume this motor is shot?
Just so you know, you'll never get 12v at the starter while cranking. It will be somewhere around 10.
If you use a starting fluid please use WD40 or something like that, never ether.
Your PCM from Napa may either, 1. Isn't flashed correct to your setup or 2. Was never flashed to begin with.
To have it flashed or checked, it has to be in the truck at a dealer as their setup ties into the OBD port.
With the old PCM, does the tach move when cranking? If not, could be a CPS.
Is the HPOP oil reservoir filled up?
Is there fuel in the bowl and pressurizing?
If the HPOP system doesn't pressurize in a certain amount of time the PCM will "time out".
And the other things Hornet said to check.
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