sick 73 - Ford Powerstroke Diesel Forum
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post #1 of 17 Old 02-22-2012, 02:02 PM Thread Starter
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sick 73

Truck starts and idles fine runs fine till you need alot of power then the service engine light comes on and runs like crap shaking missing bad. Lit ldle and runs fine till you need power then it falls on its face again new fuel filter new cam sensor full of fuel. codes P0470 and P0478 any help would be great.
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post #2 of 17 Old 02-22-2012, 02:08 PM
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Buddy of mine had an issue similar, it ended up being the HPOP AND he was getting air in the fuel line from a small crack somewhere. Any other known issues? leaks? started out of no where?

2000 F250 4x4 Supercab Lariat 7.3
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post #3 of 17 Old 02-22-2012, 02:10 PM
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Here's what the codes are with the possible causes.
P0470 - Exhaust back pressure sensor circuit malfunction - Biased sensor, open signal return
P0478 - Exhaust pressure control valve high input - Plugged sensor line, stuck butterfly, restricted exhaust

Do you have a catalytic converter? Could it be clogged?
Is the Exhaust Back Pressure Valve stuck shut or partly shut?


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post #4 of 17 Old 02-22-2012, 02:17 PM
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both codes have to do with the exhaust back pressure valve

P0470 Backpressure Sensor Circuit Error
P0478 Exhaust Pressure Control Valve High Input

your EBPV maybe closed/or closing and choking the motor.

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post #5 of 17 Old 02-22-2012, 02:18 PM
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looks like i am slow to the party

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post #6 of 17 Old 02-22-2012, 02:25 PM
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try unplugging your ebpv and see if that helps. That would be the first thing i did before i went out and spent money on some new sensors for that whole thing.

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post #7 of 17 Old 02-22-2012, 06:02 PM Thread Starter
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Will have time to try to unplug the ebpv tube in the morning thanks for the help still wondering if screen in fuel take is plugging
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post #8 of 17 Old 02-22-2012, 06:47 PM
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Will have time to try to unplug the ebpv tube in the morning thanks for the help still wondering if screen in fuel take is plugging
There is a difference between the EBV and the EBPS.

The EBV is the solenoid in the pedestal under the turbo, than closes the valve in the exhaust housing creating pressure on the turbo/engine. (This is what to unplug with the truck cold/off.)

EBPS is a sensor that measures the back-pressure in the exhaust, and is needed for optimal running/fuel management. (DO NOT UNPLUG!)

When the engine runs poorly... does it seem like he whole thing or just one side?

Pull your ICP plug too, and check for signs of oil on the plug/harness.


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post #9 of 17 Old 02-24-2012, 06:17 AM Thread Starter
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sick 7.3

Truck is at my farm about 90 miles away will try to work on over weekend. The truck seems to run poorly on both sides as in starved for fuel or air I really appreate the help and support form all. I did pull the ICP plug and it was clean and dry no oil.
Thanks I will get back to all when we get it figured out.
Terry
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post #10 of 17 Old 02-25-2012, 02:03 PM Thread Starter
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sick 7.3

Tomang07 you nailed it unhooked the sensor under the turbo and runs way better seem a little doggy. Will replace the sensor when I can get one I have a question Ford $185 or Orellieys $105 ? I guess they need a power stroke for dummies all the abbrebiations lose me so thanks for spelling it out for me.
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Terry
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