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Old 07-13-2012, 07:33   #1 (permalink)
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loss of power

I have an 05 F250 super duty 5.4L and I found that between 3000 and 4000 rpm's that there is a significant loss of power and bogging at wot. Any thoughts as to what could cause this? Injectors? Fuel pump or filter?
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Old 07-13-2012, 17:50   #2 (permalink)
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Re: loss of power

What's the fuel pressure. Autozone will pull codes for free. That may shed some light on it too. If the fuel filter hasn't been changed, I'd replace it.
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Old 07-15-2012, 14:42   #3 (permalink)
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Re: loss of power

I definitely plan on replacing the fuel filter but no lights have lit showing any sign of a thrown code.
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Old 07-15-2012, 15:36   #4 (permalink)
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Re: loss of power

The light doesn't have to be on for a code to be there.
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Old 07-17-2012, 11:17   #5 (permalink)
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Re: loss of power

Engine light just came on yesterday with a PO506/"idle air control lower than expected." Then when I got to work this morning my battery died. Don't think there is a connection, just a serious coincidence. So, I had a performancechipsnow hooked up. I removed it when I replaced the battery and the code still came up. Performancechipsnow told me that it is unrelated to the chip, which I believe is possible. My engine is Idling around 1000 rpm I guess to compensate for the low idle. Now could this be caused by carbon buildup on the throttle body, a bad connector, or just a dirty or bad sensor?
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Old 07-17-2012, 11:46   #6 (permalink)
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Re: loss of power

Try cleaning the IAC and throttle body. Takes 2 different cleaners.
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Old 07-17-2012, 12:29   #7 (permalink)
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Re: loss of power

I would have to remove the air box for that right? Which 2 cleaners, throttle body and?
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Old 07-17-2012, 13:45   #8 (permalink)
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Re: loss of power

Carb cleaner.
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