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So I’ve got a 2000 7.3 with 260k, with a whole slew of codes (over a dozen) mostly seniors receiving high input, oil, air, trans temp, etc. with the most predominant code being p1668. Truck is very hard to start, sometimes revs itself after started and has a miss at 2k and above. Would it be safe to assume I need a pcm or idm? And how do I know which?
Injectors being bad aren’t out of the question but I doubt they’d set off all these codes
Why would you even think of throwing a PCM at it? Take one of the simpler codes, find out the code setting criteria for THAT code only, and do a little diagnostic work. If you eventually find the fix, move onto the next code. If you work your way through the code setting criteria, you will get to the end: bad PCM, but only if you test/measure each criteria to rule out if it's good/bad. If you start at the end of the criteria (bad PCM), you would have wasted $$$$ and made no progress.
TIP: one of the codes might be the cause of some of the others.
Check for water leak damage (green crusties) near major electronic components, especially on the back side of the fuse panel.
Why would you even think of throwing a PCM at it? Take one of the simpler codes, find out the code setting criteria for THAT code only, and do a little diagnostic work. If you eventually find the fix, move onto the next code. If you work your way through the code setting criteria, you will get to the end: bad PCM, but only if you test/measure each criteria to rule out if it's good/bad. If you start at the end of the criteria (bad PCM), you would have wasted $$$$ and made no progress.
TIP: one of the codes might be the cause of some of the others.
Check for water leak damage (green crusties) near major electronic components, especially on the back side of the fuse panel.
-- Dave
I can’t thank you enough, your comment convinced me to go out and check wiring one more time. Pulled the wiring harness from pcm and idm and boom, three chewed wires. One signal return, one ground, and one exhaust valve wire. Going to fix them tomorrow and get back to you, thanks again Dave
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