2002 LB7 powerloss new guy here

[ryanford]

cp3 is fine replaced injectors fuel air filters airflow sensors truck runs will not go over 2200 rpm falls on its face i can get about 60mph out of it if i take my foot offf and let it shift? $7K in and none of the dumbasses around here can fix it i have a fass lift pump in a box but i dont think is going to get it. cp3 when tested is making 135 145 while power braking as soon as the truck is moving it falls off ? NO CODES AT ALL!

P.S, GOODRUNNING STRONGTRUCK I LIKE IT VERY MUCH.

 

[gmduramax]

Where did you get injectors from?
Is fuel pressure following desired?
FPRV?

 

[2004LB7]

Welcome

Also, double check you are not getting air in the fuel to the CP3 with a clear hose. If all is good do a return rate check on the injectors, cp3 and pressure relief

 

[ryanford]

Where did you get injectors from?
Is fuel pressure following desired?
FPRV?

injectors top notch remans! yes fuel pressure good

fprv? not changed still the same if i understand your acronym

 

[ryanford]

Welcome

Also, double check you are not getting air in the fuel to the CP3 with a clear hose. If all is good do a return rate check on the injectors, cp3 and pressure relief

yes starting to think fuel pressure valve
not sure had 2 master mech. put high dollar snap on puters to it no codes again mystery

 

[ryanford]

Where did you get injectors from?
Is fuel pressure following desired?
FPRV?

so you dont have one what are your qualifications?

 

[TheBac]

Moved to LB7 section.

Where did you buy the injectors from? Not "top notch".
If you have a log of the CP3 pressures when the issue is happening, post it.

 

[Chevy1925]

Removing my help after reading your comments. I see why the master techs were no help to you.

 

[gmduramax]

injectors top notch remans! yes fuel pressure good

fprv? not changed still the same if i understand your acronym

Your injectors are bad.

 

[gmduramax]

so you dont have one what are your qualifications?

Good luck getting any help now