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Rawze

looks to me like you missed something EXTREMELY IMPORTANT duting your adventure there....

The 559 fuel-code fault that is often also related to a very well known flaw of the ISX's ... - The COMPLETE ENGINE DESTRUCTION that ensues with only a subtle 559 code that comes and goes. The issue is that the fuel pump starts failing, it bleeds metal shavings into the entire engine, and the only clue most of the3 time is a ghost 559 or other fuel pressure code comes and goes. - A few days, or a month later, and the engine cannot be saved, everything internal is completely destroyed. It is nothing whatsoever to play around with. - That fuel pump MUST ALSO BE ALSO CHECKED, and its guts replaced if it has more than 8,000 run time (or 400k miles) on it, even if they look ok.

NOT CHECKING FOR THIS, especially on a recently purchased engine/truck is a HUGE GAMBLE!!!.
info: https://rawze.com/forums/showthread.php?...5#pid72475

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NEXT:... ASSUME THE DELETE IS BAD AND CAUSING PROGRESSIVE DAMAGE!!!... I don't care how you think it runs. If you value that engine at all, then you need to copy that program from that ECM asap and have it inspected to ensure its not eating the guts out itself internally.

- More then 90% of every file look at each year are.. half of which driver swears nothing it wrong while its blowing head gaskets and tearing up the engine internally.

copy the program out of the ecm and e-mail it to me for a proper review of what someone did in there.
info: https://rawze.com/forums/showthread.php?...5#pid72945

Also...
Is the VGT turbo still on it?
Is there a proper block plate between the Exhaust manifold and EGR cooler at cylinder #1?. .. at the intake piping as well?..

Are the cans fully gutted?.. including the SCR??>.. which many ppl do not do properly?.

Has the main harness for the AFT systems going down to the cans unplugged?.. -- IF SO, the is there still 60-ophms on the J1939 network, because of some dumbersse unplugging too much stuffs?.
'

A lot of unknowns that, as a truck owner,.. you need to know the answers too if you want things to be right and not harmful/destructive long term.