Interesting 03' 6.0 Issue, Help! PO278 - Ford Powerstroke Diesel Forum
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post #1 of 4 Old 10-15-2019, 10:25 AM Thread Starter
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Interesting 03' 6.0 Issue, Help! PO278

I am aware this has been discussed many times before, however money is tight and I cannot afford to throw parts at the truck at the moment. The motor has Studs, CAI, Alliant 155/30 injectors which are 1 year old, Coolant bypass kit, EGR is deleted, Blue spring mod, 4" turbo back with a muffler, and the fuel filters and oil filters have always been changed with OEM materials, and Rotella t6 with Archoil Fuel and Oil additive. The truck is running the motor and trans safe tune from PHP.

The issue, The truck idles OK with a vibration, you can feel it in your seat, and driving in OD also gives a vibration, almost like a out of balance tire. If you ever so slightly push the accelerator, it will almost buck, as if it was confused. It does this very rarely. It has plenty of power, Starts easily, doesn't smoke anything- ever. Drives well aside from the vibration, I thought it felt off so I pulled the Codes via Insight CTS2, Got a PO278 code. Wiggled the harness, no change. Unplugged #6 Injector, motor immediately began to miss, plugged that back in. All cylinders passed a compression test. FICM voltage never drops below 50. Does not leak oil, coolant, nothing. Some common values at Idle speed are as follows. The ICP looks low to me, so I am suspecting a ICP sensor? Could that cause the code and rough running? I will be conducting a buzz test when my buddy finds his laptop.
IDLE SPEED, warmed up
ICP:580
ICPv:0.9
IPR:22%
RPM:636
FICM sync: 1
FICMv: 50
Delta: 4'
Any and all help is appreciated, have a long trip coming up, and looking to get this resolved quickly. Thanks!
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post #2 of 4 Old 10-15-2019, 10:59 AM
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Since you don't have much money, why not swap #6 and #4 injectors and see if the code follows the injector or stays on #6? I am guessing that it will follow the injector.
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Mark
06 F250CC SB FX4 Lariat; ARP studs; OEM gaskets; Banks exhaust; DynaTrac Ball joints; RACCCV6000; JimmiJammers; Ravelco; SynchroMax in trans case; Fumoto valves; Harpooned; Blue regulator spring; DashDAQ; PHP FICM; RiffRaff boots; DCPower 270AXP; Power Inverter; Bilstein shocks; BPD EGR cooler, radiator, water pump; SCT w/ SRL+; Rotella ELC Ultra Coolant; X2Power AGM batteries
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Last edited by bismic; 10-15-2019 at 12:18 PM.
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post #3 of 4 Old 10-15-2019, 03:48 PM Thread Starter
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Quote:
Originally Posted by bismic View Post
Since you don't have much money, why not swap #6 and #4 injectors and see if the code follows the injector or stays on #6? I am guessing that it will follow the injector.
UPDATE
yes, that was going to be the plan for tonight, however I couldn't shake the feeling that it could be my ICP, sure enough, I removed the heat shield, and the sensor was filled with oil, I started the truck with the sensor unplugged and it eliminated the idle vibration. New sensor will be put in tomorrow, and I will keep this post updated. This was very odd to me as the icp values passed for typical. Always learning with these~
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post #4 of 4 Old 10-15-2019, 04:01 PM
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ICP sensor is usually condemned when the volts are not matching the pressure and yours seemed to match. Hope it fixes it though, if there was oil in the pigtail, indicating that the sensor was leaking oil through it, the sensor definitely needed to be changed (along w/ the pigtail). A bad ICP sensor can definitely cause some rough running.

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06 F250CC SB FX4 Lariat; ARP studs; OEM gaskets; Banks exhaust; DynaTrac Ball joints; RACCCV6000; JimmiJammers; Ravelco; SynchroMax in trans case; Fumoto valves; Harpooned; Blue regulator spring; DashDAQ; PHP FICM; RiffRaff boots; DCPower 270AXP; Power Inverter; Bilstein shocks; BPD EGR cooler, radiator, water pump; SCT w/ SRL+; Rotella ELC Ultra Coolant; X2Power AGM batteries
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Last edited by bismic; 10-15-2019 at 04:05 PM.
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