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Discussion Starter · #1 ·
bought a 2001 250 7.3 with 89000 miles and the truck had been sitting with occasional start ups for about 8 years. Needed IPR to start and drive away. Loss of power when under load. I have replaced in order, IPR, ICP, HPFP, fuel filter, oil filter, air filter, batteries, alternator cam shaft position sensor, contribution tests show low cont on 1,3 and 8. Truck will idle np but not move for long under its own power. Don't want to keep just throwing money at this thing I just want to fix it. Any help please!!!!!!!
 

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Did you change the oil? Make sure you have good oil and run codes. Then check oil pressure and fuel pump pressure. Also waste gate could be stuck from sitting.
 

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Discussion Starter · #3 ·
Did change oil and filter, but it is not giving codes. Just did am OHM test. Results are
CYL GP 8 0.8 INJ- 3.0
CYL GP 6 0.7 INJ-2.8
CYL GP 4 0.7 INJ- 2.8
CYL GP 2 0.8 INJ - 2.8
CYL GP 7 0.8 INJ- 3.1
CYL GP 5 1.2 INJ-2.9
CYL GP 3 1.0 INJ- 3.1
CYL GP 1 0.6 INJ - 3.2

All reading through harness in vehicle
 

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Discussion Starter · #4 ·
Did change oil and filter, but it is not giving codes. Just did am OHM test. Results are
CYL GP 8 0.8 INJ- 3.0
CYL GP 6 0.7 INJ-2.8
CYL GP 4 0.7 INJ- 2.8
CYL GP 2 0.8 INJ - 2.8
CYL GP 7 0.8 INJ- 3.1
CYL GP 5 1.2 INJ-2.9
CYL GP 3 1.0 INJ- 3.1
CYL GP 1 0.6 INJ - 3.2

All reading through harness in vehicle
How do you check the waste gate?
 

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It's not a wastegate issue. The wastegate is there to prevent overboost, opening as boost gets to about 17 psi. It doesn't sound like you're getting anywhere near where the wastegate would need to open.

The exhaust backpressure valve may be stuck, but typically it would be stuck open. If it were closed it would cause poor performance. You can check it by looking under turbo outlet on the passenger side where you'll see a pushrod and lever. Check to be sure the lever can move (the pushrod is under spring pressure, so may be hard to move.)

Your issue may be fuel delivery. Bacteria grow in diesel fuel and can clog the filters inside the tank pickup unit. You can check that out by disconnecting the fuel line from the inlet of the frame mounted fuel pump (under the driver's seat area), and connecting a piece of fuel hose to it and put the other end in a container of clean fuel, and go for a test drive. If it runs well, you'll need to drop the fuel tank and clean out the two filters inside the tank pickup unit.

Since you have a scan tool, set it up to monitor IPR duty cycle and ICP. ICP should get up to around 2000 psi with IPR below 65% on heavy load.
 

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Wastewater could be stuck open. Or the exhaust back pressure valve stuck closed. You can grab the watsegate arm and should be able to exercise it. Do it cold. You will need to lay on the engine and reach to the back of the turbo. Getting a scan can tell a lot. Have to use a good scanner or nex gen star tester.
 

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Wastewater could be stuck open.
Spellcheck got you. ;)

Even if the wastegate were stuck open, it wouldn't affect power that much. It's normal position is closed, so it would more likely be stuck closed. Can't hurt to check that it will move however.
I still think it's a fuel delivery issue.
 

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It's not a wastegate issue. The wastegate is there to prevent overboost, opening as boost gets to about 17 psi. It doesn't sound like you're getting anywhere near where the wastegate would need to open.

The exhaust backpressure valve may be stuck, but typically it would be stuck open. If it were closed it would cause poor performance. You can check it by looking under turbo outlet on the passenger side where you'll see a pushrod and lever. Check to be sure the lever can move (the pushrod is under spring pressure, so may be hard to move.)

Your issue may be fuel delivery. Bacteria grow in diesel fuel and can clog the filters inside the tank pickup unit. You can check that out by disconnecting the fuel line from the inlet of the frame mounted fuel pump (under the driver's seat area), and connecting a piece of fuel hose to it and put the other end in a container of clean fuel, and go for a test drive. If it runs well, you'll need to drop the fuel tank and clean out the two filters inside the tank pickup unit.

Since you have a scan tool, set it up to monitor IPR duty cycle and ICP. ICP should get up to around 2000 psi with IPR below 65% on heavy load.
what is ipr and icp
 

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ICP: Injection Control Pressure (Sensor)

IPR: Injection Pressure Regulator

Here is a very long list of acronyms:
 

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The IPR is an actuator. It makes something happen when it gets a signal from the computer. In the case of the IPR, it changes the pressure delivered by the High Pressure Oil Pump to the heads, reacting to the signal that the PCM (computer) gets from the ICP sensor.
 
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