when i turn on my torgue management my chk engine light comes on after a while,code p0191-rail pressure sensor. im thinkn its just my stock fuel pump cant deliver enough fuel that the programmer is telling it to and its pissing off the ecm. but wouldnt that be a fuel pump code? not sure. probably a cp3 would fix this. not too worried about that it runs great-if the fuel pump goes out i'll upgrade it, but a few days ago my 1-2 shifts are weird at low throttle. like its surging at 1100 rpms/10-15mph. once over that its fine, shifts alot harder when you granny it,shifts smooth as butter when u floor it since i upgraded the tc&vb .but this is new& different. solving it right now by using the tow/haul- it shifts at a higher rpm, keeps trans. temp low,probably better for trans, w/37's, also increase in fuel mileage noticed, but curious to ya'lls opinions or suggestions.-sorry so long

 

its either your lift pump not supplying enough fuel, thus draining the rail.. or your fca is going bad and causing a pressure spike and drop, however this is not good, if you continue to run the rail dry you will damage the injectos from starving them for fuel... get you a good aftermarket lift pump, and your good to go, no need for a cp3 mod unless your going to put in nozzles that are more than 90hp, the cp3 can tolerate it until as far as fuel pressure goes, and remember, the cp3's wont kill over like the vp pumps if they miss a hint of fuel they will shut down to prevent damage...

 

Thats a Very True thing Kyle But you still get HP from Modding the CP3 so it's always a good deal.

 

thanks

 

very true chunk... thanks for helping catch him up...