I took the 86 F250 to yankee lake tonight for some fun in the mud. Boy did we tear it up

Anyways... on the way there i had to pull over and restart the truck 4 times because the wrench light kept popping up. Before it does this the truck would buck and not have any power like the turbo was kicking out. The boost gague stayed steady, but it was running like crap above 2500 rpms and above. I only get this light when hauling something on a trailor. The truck will also buck and feel like the turbo is kicking out on a long trip going up hills and what not.

Tonight is the first time i got a CEL and the DTC of P0299. I have no idea where to start on this one. I drive it kind of hard, so i dont think the turbo is carboned up. There is no smoke either...

The truck is a 2006 F250 6.0L with a 4in straight piped exhaust. Other than that she's bone stock. What is going on with it??

 

I had this very thing happen to me minus the bucking. The P0299 is and Under/Over Boost code. Some things to look at.

1) You will want to check your EBP sensor, sets (vertical) in about the middle of your drivers valve cover, has a metal tube that goes to your exhaust manifold. It is easy to get to when you pull your air cleaner box out. Make sure the tube and sensor are clean.

2) Check your MAP sensor. The bracket to this sensor sets on top of the HVAC case near the firewall. It has a hose that goes to your intake manifold. Make sure all is clean as well.

3) You may have to pull the turbo and clean it. IIRC Bismic put a procedure together and is in the Tech Folder. BTW I have not done this yet.

 

Just in case you have nothing better to do today....

https://www.ford-trucks.com/forums/1...0-vgturbo.html

 

Well I put a big scanner on it from a buddy of mine and I have two codes in the computer. P0299 and the other is P0249 i think. It's under boost and over boost codes. I don't see how the truck can b over boosted and under boosted at the same time?

 

I took a look at those things and they all looked fine to me. Am I going to have to replace the turbo? I heard from some people that cleaning them really don't make a difference

 

How did you clean the EBP tube?
Did you remove the MAP sensor hose to check it?

 

I just looked to make sure everything was tight and electrical connections greased. I am not sure what the EBP tube is or where it goes. by map sensor hose i am assuming that you mean the vacuum line?

 

No, that is not quite correct (and that is why I asked).

The 6.0L does not use vacuum. You have a vacuum pump for only the 4x4 hubs (if you have 4x4) and climate control.

The MAP sesnor is what measures boost (along w/ the Baro sensor). If the hose to the sensor is plugged (or the sensor is bad), you can have the symptoms you are describing.

Look this over to learn where the sensors are.
6.0L Bible Table of Contents
http://dan.prxy.org/Truck/6L_bible_h.../Page_009.html

The EBP is used in the turbo operation. Sometimes the metal tube to it will get plugged w/ soot (as does the MAP sensor hose).

Both of these need to be clear of plugging for the turbo operation to work as it is intended.

BTW - the code is used as an over/under boost alert. This doesn't necessarily mean that it is doing both.

 

Ohh got ya. I hope that it is something simple and not a reason to replace the turbo. Thank you for the link and clearing that up for me. I will check it out and report back.

What/how should should i go about cleaning these??

 

Remove the EBP sensor and you can clean the tube by "rodding it out" w/ a heavy gauge wire (can't recall what gauge you need, but you get the idea). Bend the end so it doesn't slip all the way down into the tube. Some folks have also said a flexible .22 rifle cleaning tool is the right diameter. Not that hard to remove the tube and make it a little easier if you want to.

For the MAP hose, remove it and inspect/clean.

 

I used one of the replacement speedo cables in the "help" section and a drill. It cleaned the tube right out.