almost there...need some help to push me over the top to start the truck

[hotairgypsy]

What a journey i have been on to get this truck running. I bought a Snap-on MT2500 scanner and used it today to further troubleshoot my truck..i cleared out all the codes to make sure nothing was stored in the scanner and performed my test...i have a video to show the RPM, IPR, and ICP reading while cranking...i checked the codes after the test and here are the codes it gave me

P0344
P1670

keep in mind the rpm needle does move while cranking
oil pressure needle comes up while cranking
passed the injector buzz test
passed KOEO test
new glow plugs installed and ohm tested to make sure working
HPOP replaced
IPR pulled, torn down, and cleaned
all fuses i could find pulled and ohm tested
all relays i could find pulled and tested

7.3 Crank - YouTube

[hotairgypsy]

I GOT IT!!!!!!!!! unbelievable journey to get to this point...I was doing a bunch of research and i found a post where the poster said he had both codes i had and it was the CPS...well i remember reading if the rpm needle was moving while cranking it said the cps was fine. well i did have needle movement...so i was thinking maybe the connector was dirty or something. Well i unplugged it and there was some oil on it so i cleaned it with electrical cleaner and put dielectric grease in it so protect it. well i decided to take out the cps in case it was dirty also inside the contact part. well i went to unscrew it and was having a hard time getting a socket on it. well i reached up there and could not feel the screw head but felt some metal ...well i noticed it turned so i unscrewed it and the pic shows what i found...the head was broken off...well i took out the cps and decided since i had it out i would just replace it. well put a new one in and new bracket. found a new replacement screw and installed it. well went to crank it and it just started up after the second attempt!!!!! we are a go houston....a fricken 10 cent screw!!!! unbelievable....

[Six0~Stroker]

CONGRATS

[terryknight]

glad it was such a simpl fix

[Im_Strokin_ur_Cummins]

I was in the same boat only,I replaced 2 starters, CPS, glow plugs,valve cover gaskets, and about 4 GPRs, before finding out the GPRs we got didnt work so went to ford and bought one and boom now it starts reliably