I have a 2003 f450 with 196k miles. The truck has no power until 55mph then you can hear the turbo actually spool at 55mph. When hitting the accelerator it falls on its face and takes about 3-4 miles to get up to 55mph. Hooked up scanner and no codes are popping up.

Thanks for any guidance!

 

Read this thread:

https://www.ford-trucks.com/forums/9...condition.html

And when people say they have no codes, I have found that many really do. What scan tool are you using?

 

my neighbor is a mechanic at Ford Dealer (doesnt work on diesels) and used his scanner..thinking it was a snap on one

 

Well. that's convenient for sure. Snap On scan tools seem to be very good.

So no codes. That means you have to post data. Read the thread and you will get an understanding of how MANY things can cause a low power situation. Ford also published a low power troubleshooting guide for the 6.0L IIRC. Maybe your neighbor can find that. Much of my thread is from that Ford procedure.

In the meantime, make sure oil levels are good, and ESPECIALLY not over-full.

Check fuel flow to the secondary fuel filter nad make sure it is a strong flow with no bubbles (you will need to remove the secondary fuel filter and any standing fuel. Be careful and have a helper - it fills VERY quickly. Again, you should see NO bubbles.

Watch ICP actual, ICP volts, ICP desired, and IPR % duty cycle when trying to gain power. We need to see that data.

Also, get the engine wired up and disconnect the VGT actuator connector when idling. Post up what you saw and heard in that test. While you are at it, make sure that connector is in good shape and connects solidly. Also make sure the wiring is good to that connector.

Look for signs of exhaust leaks.
Look for signs of intake leaks.
Make sure the filter minder does not show a plugged air filter.

etc - it is all in the thread.

 

Thanks for getting back to me. Iam going to check on all these during the week and post up results. Its been happening for a few months and no change. Changed oil did air filter change and changed all the fuel filters. Add diesel treatments also.

 

did recheck for codes. this is what popped up...

 

P2263:

Stuck turbo, MAP sensor, MAP hose plugged or leaking, CAC hose disconnected or leaking, intake leaks, exhaust restriction, exhaust leaks, EBP sensor or EBP tube plugged, or bad VGT solenoid.

This code is set when MGP does not go over 15kPa or 2.2 psi when the following conditions are met: rpm must be over 2800; VFDES above 35; and EGRVP above 0.10. All of these conditions must be met for 5 seconds for the code to be set.

This code is used to detect a charge air cooler hose that has become disconnected. This code can also be set if there is ANY condition that would produce low power.

 

thanks for quick reply. Where would you suggest I start? I took a video of the scanner looking over all the sensors...

 

Look for leaks. Exhaust leaks should show soot. Intake leaks are a little tougher, but inspect the CAC hoses at a minimum.

Remove the MAP hose and inspect it for leaks or being plugged.

Remove the EBP sensor and see if it has soot inside the sensor. Use a backup wrench when removing the sensor or you will probably bend the tubing under it.
Run a stiff weed whacker string down the EBP tube all the way to the exhaust manifold to check for restrictions.

Post what EBP, MAP, and Baro readings are at KOEO.

You can pressure test the intake and the exhaust - there are youtube videos on it.

After the engine is warmed up, idle it in your driveway and disconnect the VGT solenoid connector. You should hear the engine change sounds. Be careful and don't break the tabs off of the connector.

Most, if not all, of what I just typed is in the thread I linked to above.

 

Thanks bismic... i will check my truck for these too. Just happened to read what you posted on here for P2236. Thats the only code i have. Will start with the MAP and then check the ebp tube. Thank you!