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CEL when pulling hill with load
i've got an 03 sd 7.3 auto with a reman. eng. still under factory warr. the problem is when pulling a long hill with 8,000lb trailer the CEL comes on and i start loosing power, (3rd gear). empty the truck runs great, no CEL, plenty of power. if you drop it down to 2nd before the CEL comes on it will pull any hill at 3500rpm all day long with NO CEL on. it's been to FORD many times and they can't fix it. p1211 keeps coming up, they have put in 2 hpop's, 3 inj., replaced 1 warped ex. man., new wastgate cylinoid that brought boost up to 19lb., new fuel pump, fuel filter, fresh oil and new filter, replaced ipr and ipc, new o-rings on all inj. this motor is stock, no chip, just 4in ex. and banks ex. brake. the problem was there before the ex. brake was installed.
the orig. engine had no problems at all with power loaded, unloaded, never a CEL even when it snapped 2 conecting rods at 88,000mi. (thats another story in itself).
the reman. eng. came complete with turbo, pumps, sensors ect. could the eng. blowing have affected the ecm?
all your help is much needed since FORD can't figure it out and 1 dealership won't even work on it anymore and the others just want to start throwing parts at it at my cost evan though the problems didn't start till the reman eng. was installed. i would be happy to pay for the fix if it's something else besides the eng. if it fixes the problem.