Turbo bark! Cant figure it out! - Ford Powerstroke Diesel Forum
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post #1 of 13 Old 07-18-2019, 07:07 AM Thread Starter
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I am completely frustrated at this point! I have an 04 F350 6.0 4x4 with 175K on it. I bought it from family 4 years ago and have had no major issues. A month ago I noticed that when I accelerated and got just above 2K rpms, I would lose power and the turbo would bark, and I'd blow black smoke. It doesnt do it when the engine is cold, only when it gets hot. Over the course of a month I have put almost $1,000 into my truck trying to fix the problem. Had a friend put it on his scanner and he said everything looked good. ( Adequate boost pressure, oil pressure, fuel pressure, good injectors, vanes opened and closed fine etc). I replaced ICP, EBP, MAP, Crankshaft and Camshaft position sensors, pulled and cleaned turbo, oil change, fuel filter change, air filter change, EGR delete was done when I first bought it. I'm getting no CEL's. Im at a loss and am about to have to sell it. Any suggestions would be appreciated.
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post #2 of 13 Old 07-18-2019, 07:52 AM
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Turbo bark! Cant figure it out!

Replaced air filter?

Edit- I see you did. I still wouldn’t completely rule out an air flow/ intake problem.....
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post #3 of 13 Old 07-18-2019, 08:27 AM Thread Starter
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Could it be the MAF sensor? Only one I didnt replace?
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post #4 of 13 Old 07-18-2019, 09:14 AM
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Could be MAF...check all wiring over well.

Also sounds like a possible chaffed wire on your VGT solenoid pigtail that's making contact somewhere when the engine gets hot and torques because of throttle. I'd check those wires over very well.

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post #5 of 13 Old 07-18-2019, 10:28 AM
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A scanner cannot read fuel pressure. There is no OEM sensor. Unless you have a separate gauge or your friend put a test gauge on it, there is no way to read the fuel pressure. That said, it sounds to me like a boost leak. A good place to start would be the plastic cold side pipe. Don't just look at it, pull it out so you can see and inspect the whole pipe. Then throw it away and get the 03-04 metal pipe and boots and install that.
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post #6 of 13 Old 07-18-2019, 02:26 PM Thread Starter
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I replaced the wiring on the VGT soleniod because of that reason. Nochange. What has me puzzled is that it's only once the motor warms up that it does this.
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post #7 of 13 Old 07-18-2019, 02:28 PM Thread Starter
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Ours is already the metal pipe, and we have replaced all boots.
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post #8 of 13 Old 07-18-2019, 04:28 PM
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Do you still have the flexible turbo oil feed hose? It's a long shot, but the hot oil could be causing the hose to swell and starving the turbo from oil. It could also be a boost leak on the turbine side at the bellows. The turbo farts and black smoke point directly to a rapid loss of boost.

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post #9 of 13 Old 07-18-2019, 05:31 PM
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04' should have metal CAC pipes , does this truck still have the EGR throttle plate installed ? Map hose also should be checked .
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post #10 of 13 Old 07-18-2019, 05:35 PM Thread Starter
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UPDATE!!!! EGR throttle plate was the problem child this whole time! Removed it and presto! I have my Big Papa back! Thank you soooo much HP MACHINE!
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