Engine/Transmission (1998.5 - 2002) Power & Mileage went away

[paddler]

No fault codes, 13-15 lbs fuel pressure both sides of the filter, fuel volume 2 liters in 30 seconds, intercooler hoses and clamps tight, pre heater working and no burnt grids. Don't know where to go next??? Power is so bad I'm using granny to start pulling a 1800lb trailer!

Thoughts and suggestions appreciated

 

[Graphic man]

It sounds to me like a MAP sensor

it could be bad with no codes and causes the same problems

 

[rkressg]

What are your EGT's and boost #'s like? Any smoke out of the tailpipe (white, black)? Could be a million different things.

 

[fox]

WHAT YEAR truck is it?

 

[paddler]

Sorry, thought my profile would show up. Pretty much stock 99 24V, No noticable change in either EGT's or boost. Not running any hotter, no loss of boost (18lb peak) and no overboost codes. Only time I get any smoke is cooler starts. Is there a way to check the MAP sensor without swapping?

 

[Graphic man]

i don't think there is any way of testing it,

there not expensive it's easer just to replace it.

i have heard of some people with your same problem and a Map fixed it.