6.4 won't rev above 2450 rpm's???? - Ford Powerstroke Diesel Forum
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Old 06-19-2009, 11:32 AM
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6.4 won't rev above 2450 rpm's????

I have a 2008 F-450 6.4L manual 6spd with a full 5" dpf and cat delete,
a 5"magnaflow filter back system, an Sct Livewire tuner, and AFE intake on it. Truck ran great for about 150 miles after dpf delete and tuner installed and then started studdering after 2450 rpm occasionally and thenthe check engine light came on. Then it started to get extremely bad and will not rev above 2450 rpm's in any gear. It falls flat on its face like a vehicle does with a speed limiter. The pedal has no response after the 2450 rpm.

ANYONE have a clue whats goin on?????? THANKS
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Old 06-19-2009, 11:49 AM
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I would return it to stock tuning and see if that makes a difference. Also
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Old 06-19-2009, 05:11 PM
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I did return it to stock and unplugged everything to do with the tuner.... It still does the same thing as with the sct... also there is like no power whatsoever from 0-2450 rpm, as if its in a major limp mode
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Old 06-19-2009, 08:51 PM
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Quote:
Originally Posted by NRHX2002 View Post
I have a 2008 F-450 6.4L manual 6spd with a full 5" dpf and cat delete,
a 5"magnaflow filter back system, an Sct Livewire tuner, and AFE intake on it. Truck ran great for about 150 miles after dpf delete and tuner installed and then started studdering after 2450 rpm occasionally and thenthe check engine light came on. Then it started to get extremely bad and will not rev above 2450 rpm's in any gear. It falls flat on its face like a vehicle does with a speed limiter. The pedal has no response after the 2450 rpm.

ANYONE have a clue whats goin on?????? THANKS
What codes does it have? You said that it had a check engine light. That would be what you need to start with. I would bet that you are having a P0087 code (Low Fuel Rail Pressure or some such thing). This sounded exactly like what was going on with my truck when the high pressure fuel pump went out.

The tuning probably sent your already-flaky HPFP over the edge. It should be covered by warranty, but you are going to have to return the truck to stock - entirely. Some times dealers will argue over cold air intakes and tail pipes.
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Old 06-22-2009, 03:37 AM
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The codes i am pulling off the truck are U0100 and U0115
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Old 06-22-2009, 04:56 AM
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The U0100 means "Lost communication with ECM/PCM "A".
The U0115 means "Lost communication with ECM/PCM "B".

What that means to you and me, I don't know. I think it needs to go to the dealer for service.
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Old 06-22-2009, 05:03 AM
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I looked up the codes right after i posted them and i have not a clue what they mean either. I'll just have to rip everthing off the truck to take it back down for service.... not fun
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Old 06-22-2009, 05:07 AM
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After you do it a couple dozen times, you tend to get pretty good at it.
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