Hey y'all, been a long time sense I've posted, but I've started to develop some new problems on my truck.
Background on the truck its a 2007 f250, 6.0, has brand new cylinder heads, arp head studs, ipr research remote oil cooler and coolant filter, all other bulletproof stuff, oem gaskets, blue spring mod, ect... truck has drove great since that was all done approx 5000 miles ago... anyways i drove my truck to school and left it parked for approx 12 hours.. it drove great there, no problems... i go back to get into my truck 12 hours later and it would boost right... it builds boost on my sct x4 but the truck just won't go anywhere, and it was turbo farting worse than it ever has (the cha cha cha when you let off the pedal)... i call the shop and begin limping it to the shop and all of a sudden the truck shuts off... truck refuses to start after that so they give me a tow back to the shop... at the shop we find out i had a bad oil leak, and we add oil and it starts up, but the problem still exists, and we find it only really leaks oil from the turbo while under load...

the shop tells me my turbo is stuck and i need a new one so i decide to take it off and look at the inside to see what it looks like... i open it up and it doesn't look bad at all, no rust or anything like that... I then took the vanes off and sanded and cleaned it and put the proper pub back and reinstalled.... oh and i think i found out that the oil was leaking because the shop that did the bulletproof, did not install the turbo mounts, and this caused the drain pipe to wiggle off a little.... anyways i cleaned and reinstalled turbo and there is now no more leak... even while under load.... so i fixed the leak but it still won't boost right.... reading off my sct x4 my vgt is randomly fluctuating from about 14-84... when i start the truck it is about 50-60, and as soon as i start hitting the gas to get the truck to go it just gradually goes back down to 14 and sits there for a few seconds... when i let the truck sit it goes all the way back up to 84 and sometimes even goes back to 14, then back to 84.....

my bar is like 14.1 or something which i think is normal but my exhaust back pressure is around 40ish psi with engine off key on.. with engine on at idle it is about 60ish and while under way it goes all the way up to 150-170psi... is this a normal reading? the exhaust back pressure sensor was replaced approx a month ago, and last night i took it and the tube off to inspect for soot... and it still looked pretty clean...
im not sure exactly where to start with my problems... i spent about 5 hours last night trying to figure it out.... i don't really want to replace the turbo because it has never stuck before and has always worked great and looked so clean on the inside... any help would be greatly appreciated... having my truck in the shop is keeping me from working...
thanks so much... if you guys need any other readings please let me know.

 

Check your EBP sensor. Sounds like that is goofed up. What flash is in the truck?

 

what do you mean flash? i returned the truck back to stock tuning... never ran over street tune anyways... I hate to go out and buy another EBP sensor... u think i can take mine and the receipt back to ford and see if they will replace it? i literally bought it about a month ago.

 

You VGT is acting weird, that is what the PCM is asking the turbo to adjust the VGT to, so maybe/probably not a turbo issue. Mine is at 80 - 85 after a cold start and at idle, 60's under light load driving around, only below 50 under hard acceleration or high loads, and only reaches 15 when the computer tells it to do a full range sweep of the vanes (I've seen it do that kind of randomly when I shift into reverse after a warm start, which strikes me as both a really good idea and kind of weird). I would check wiring harnesses since you have a new ebp sensor, also intake pressure sensors.

"Normal EBP signal reading should reflect atmospheric pressure with the key on/ engine off. Typically, this is 14.7 PSI/0.88-0.9 volts at sea level, decreasing one PSI/0.10 volt for every 2000 feet of elevation. It should be within 0.5 PSI of BARO and MAP sensor pressure signals."

 

oh also forgot to post codes
p0113 intake air temp sensor 1 circuit high input (i think this one is one because i didn't put the air intake or filter on incase i would have to take turbo back off. will this affect anything)
p0299 turbo/supercharger under boost
p0403 exhaust gas recirrculation control circuit (i have an erg delete)
p0405 exhaust gas recirculation sensor a circuit low
p1102 mass air flow sensor in range but lower than expected

 

There is your problem. Put your air intake back on, hook up the MAF sensor and clear all of your codes. Then try it again.

 

i was told having the MAF sensor and intake off would have no affect on it

 

Humor me and put the truck back together before trying anything else. Why the heck would you leave the air intake off? Like sucking dust into the turbo?

 

haha i will... i haven't been driving the truck so i figured it wasn't gonna do anything leaving it off... i will install and post back... I'm just ready for this thing to be fixed and I'm willing to try anything...

 

We'll today I did more testing. After further inspection I found out that my turbo was leaking air around where the clamp tightens the two halves together... So I had to pull it again and reseal and reinstall... Same issue even after fixed... Tried the intake being plugged in with the same problems still... When I drive the truck I am registering that boost is being built on the gauge but the boost just doesn't boost the truck... My exhaust back pressure is very high with key on engine off so I thought I would unhook it... Took it for a spin and exhaust back pressure went down to I believe 24 and stayed there (I guess that's where it stays when it's unplugged). When driving it now though it feels way better and the boost is actually powering the truck but it won't hardly build 5 psi of boost at max... So I'm pretty sure it's gotta be the ebp sensor even tho it's like two months old.... I'm gonna see if ford will give me another one and try again.

 

You're EBP is way off. But you know that already. Have you removed it and cleaned it? I used MAF cleaner on mine. You may be able to use brake cleaner.

What does the pigtail and harness look like?

 

Yes I initially removed it and it was all super clean... Not like it was when it went bad a month ago and replaced it... Harness looks clean no chaffing. The is chaffing on my vgt solonoid pigtail but it's been there since I bought the truck and hasn't ever been a problem.

 

If the wiring is good, and the pigtail is good, it might be time for another one. What brand ebp did you install?

Others will have to come in with some info on how to trouble shoot the ebp wiring and pigtail. You should be able to unplug it from the pcm and check the wires for shorts, etc with a digital multi meter.

 

I replaced it with a motor craft one from the local stealership.

 

Tried a new ebp motor raft sensor. Nothing changed... When driving the truck down the rode it jumps as the boost builds up a little then stops, builds up a little, then stops...key in engine off exhaust back pressure is 48.99 psi, map 14.46, baro 14.3... Truck idling ebp is around 60, all others about the same, and at 2500 rpms ebp is approx 135... Help please