Turbo overboost caused by Exhaust back pressure? - Ford Powerstroke Diesel Forum
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Old 11-09-2012, 02:20 PM
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Turbo overboost caused by Exhaust back pressure?

Hi guys. 05 6L. I was driving a week ago and i noticed my turbo noise was way louder than normal~ looked at the boost guage, it was maxed out! around 38 or 40 psi! doing 80 kph and only partial throttle. i immediately lifted off the throttle, and continued on keeping an eye on my boost.
checked the codes on my bullydog programmer, and it came up with P0472 i belive it was - exhaust back pressure sensor. no codes for turbo overboost or anything else! so i got a sensor and changed it. the old one was pretty sooty. problem disappeared

one week and around 1200 km later, the problem is back! driving home from work, same thing happened. under partial throttle where boost should be around 10 psi its 20-25! drove it easy back to the house, started smelling coolant just before i parked. checked and found the degas cap is blowing out coolant! last time that happened, my head gaskets were effed!

is it possible the tube going to the ebp sensor is plugged, causing the engine to request more boost? i sure hope the headgaskets arent blown again!!,

any help would be greatly appreciated guys. sorry for the long winded post but i wanted to give all the info i could!
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Old 11-16-2012, 08:29 PM
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Turbo vgt is sticking. Need to remove turbo, disassemble and clean the moving parts (roloc disc with scotchpad style media). Headgaskets may be boned. Stuck closed turbo will blow the HGs quickly.
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Old 11-20-2012, 03:27 PM
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Well it sure seems to be directly related to the ebp sensor!! I removed it and cleaned the soot out of it and ran some brakleen thru the tube. Been driving it 65 k a day for last 5 days now with no re occurrence!
BTW: brakleen (green can) is NOT good for bully dog EGT probes!!! Now reads 0!!! ��
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Old 11-20-2012, 08:09 PM
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It was late (As it is now) and I was tired, blew right past the bit where you said you changed the EBP and the problem disappeared. EBP clogged can cause an overboost, but sticking VGT vanes cause the same thing, more often. If it was the EBP, I'm surprised it didn't pop some codes. Sticking turbo can come and go, I would think it would be overboosting all the time if it were the EBP though.
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Old 11-20-2012, 08:17 PM
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Yeah its kinda weird. If its overboosting, why dont i get any codes for overboost?

How does the ebp interact with the turbo? Isnt it only active when the engine is cold?
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