2000 f250 really low boost, no power, no boost leaks?

[dieselyoungster114]

My truck seems to have really low boost. Averaging around 10 psi at 2500 rpm going 50 mph at a 6% incline. I checked for boost leaks with the homemade boost leak detector. Found nothing. All the IC boots are fine and not leaking. The intake boots are fine. The up pipes are fine. I even verified the boost gauge is accurate. So there's no leaks. Disconnected my waste gate vacuum line and it hit 15 psi. Any suggestions as to what I should do now? Maybe adjust the waste gate rod? Someone told me bad mapp sensor? I really don't know but I feel I should average around 20 to 25 psi.

[grayduty]

Garrett 38r.


Sent from my iPhone using Autoguide

[JSchuricht]

Boost depends on how you drive. If you are just cruising up the hill empty, your boost will be low. If you are accelerating up the hill or have a load and are giving it some fuel you will see about 18 psi on a stock truck. If the truck is modified on stock injectors you could hit about 30 psi.

[dieselyoungster114]

Originally Posted by JSchuricht

Boost depends on how you drive. If you are just cruising up the hill empty, your boost will be low. If you are accelerating up the hill or have a load and are giving it some fuel you will see about 18 psi on a stock truck. If the truck is modified on stock injectors you could hit about 30 psi.

This is at wide open throttle. It hits 10psi and then cant go anymore. Ive gunned it on flat ground and got around 10 psi. I had a loaded car trailer on a 4% incline and got 12psi. Something is very wrong here.

[dieselyoungster114]

Any suggestions fellow powerstroke owners?

[jesilvas]

Wastegate could be weak.

[timmyboy76]

same boat man. I even swapped turbos, and still 10psi with redline hooked, 15-16psi w/out it hooked.

I did the 10k mod for ****s, and hit 22psi with redline unhooked. So i bought an ICP sensor and still the same low numbers. Think'n of try'n MAP sensor or possibly a weak hpop..dunno.

A mamber found a boost leak at where the plenums bolt to heads. Maybe try that, soap it up and pressure system again.

[dieselyoungster114]

I have recently rebuilt the turbo. And replaced the ICP sensor. Still only peaking at 10 psi. I will re pressurize the system and check for leaks again tomorrow. I checked my waste gate operation today with a compressed air and a gauge. It begins to move the rod at 5 psi then more at 10 psi its in its fully opened point at 25 psi. So shouldn't that mean I should be peaking at 25 psi?

[timmyboy76]

i'll be the guinea pig to this man. Since already tried the ICP, why stop now, right. Gonna pull the trigger on the MAP, and go from there. I'll update when available. That dont work, then the IPR, if not again, HPOP. Trucks 13yrs old, has the original sensors/units in now, so i think i got my use outta them.

[dieselyoungster114]

Originally Posted by timmyboy76

i'll be the guinea pig to this man. Since already tried the ICP, why stop now, right. Gonna pull the trigger on the MAP, and go from there. I'll update when available. That dont work, then the IPR, if not again, HPOP. Trucks 13yrs old, has the original sensors/units in now, so i think i got my use outta them.

Sounds great! Keep me informed. I re-pressurized my system with soapy water and found no leaks again. There is an extremely small leak on my up pipe. That shouldn't drop boost so much will it? I even disconnected my air box and let it breath free thinking maybe its just air restricted. No change is boost psi.