over boost problem

texaslimeaide · Mar 11, 2013

Guys I need advice. I've got an 06' F250 with 110K on it. I've got an over boost issue no matter the program. I've got and SCT TSX and thought it was a program issue. So I returned it to stock with no avail. I've swapped the vgt solenoid and upgraded the oil feed tube to the solid line. Not sure if it's the EPS, the MAP sensor, or a flash issue. I'm getting like 11psi at 70mph. It sounds like a Jake brake on deceleration and the boost numbers never go to negative at idle like they did before the issue. Help!!

sootie · Mar 11, 2013

just a shot in the dark but sometimes a bad ebp sensor or a plugged ebp tube can cause codes like that.

texaslimeaide · Mar 11, 2013

Will it always throw a code sootie? I've checked codes and have none.

Charles · Mar 11, 2013

I don't know anything about a 6oh.... but... making too much boost, sounding weird...

Have you verified that the vanes in the turbine housing are not stuck closed?

texaslimeaide · Mar 11, 2013

Yeah Charles. About 3 weeks ago I took the turbo off and cleaned it and checked the unison ring. It was dirty but not that dirty and everything moves easily in there.

Charles · Mar 11, 2013

texaslimeaide said:
Yeah Charles. About 3 weeks ago I took the turbo off and cleaned it and checked the unison ring. It was dirty but not that dirty and everything moves easily in there.

Well if you're satisfied that it's mechanically sound, then is the VGT solenoid possibly grounded to actuate? Like a PWM ground to close? If so.... do you have a chafe in that wire somewhere and it's grounding itself a little bit to the head or something, bypassing what the PCM is trying to do?

Mdub707 · Mar 11, 2013

My truck has always run around those boost pressures at that speed.

texaslimeaide · Mar 11, 2013

I can't find any broken/grounded wires. I know mine ran less than what it is now. I'm thinking it's the ebp sensor and or tube.

Mdub707 · Mar 11, 2013

Have you removed it and cleaned it ever? Check it out, I found my wiring harness chaffed right there at one point, but I didn't have an overboost problem, my turbo would just shut down going down the road in overdrive.

texaslimeaide · Mar 11, 2013

I took a look at it right after I reconditioned the turbo. The tube was dirty so I cleaned it with a brake cable on a cordless drill. Then I cleaned out the sensor best I could using parts cleaner. Today I had to run to the hardware store and the truck seemed fine now. Ran like a beast and passed everything on the highway like out use to. Boost numbers were normal again...I think it knows I'm talking bad about it lmao.