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post #1 of 12 Old 11-23-2011, 05:52 AM Thread Starter
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Help - Boost leak, exhaust back pressure sensor?

Ive owned my 94.5 f350 dually powerstroke for about 6 months now and I love it. But recently its been giving me some issues that I cant seem to figure out. I live in wisconsin and the weather here has been up and down. A few days ago while driving the truck I heard what sounded to me like an awful boost leak, when i would punch the throttle the leaking noise would instantly stop(it made almost like a suction noise, like someone putting there hand over the end of a vacuum). So I parked the truck and figured I'd drive it later and see if it did it again, well the noise continued to come back. If I have the truck in nuetral and raise the rpms up to around 1600 the leaking noise instantly appears and my rpms drop 300-400. So I decided to pull it in the shop(heated) and see if I could find the source of the problem. I didnt find anything out of the ordinary so I started it up and the noise did NOT appear. But the next morning the noise came back and ever since then its been getting worse it seems. It doesnt matter if I drive it for 15mins or 2 hours, the noise is still there. the waste gate moves as it should and my vacuum lines are all in good shape. The problem seems to be related with temperature. Im thinking exhaust back pressure sensor? Any ideas or advice? I work for a dealership (chrsyler, dodge, jeep.... I know I know but they put me thru school) and I know how they work so I rather not take it in to a ford dealership.
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post #2 of 12 Old 11-23-2011, 05:55 AM
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Ive owned my 94.5 f350 dually powerstroke for about 6 months now and I love it. But recently its been giving me some issues that I cant seem to figure out. I live in wisconsin and the weather here has been up and down. A few days ago while driving the truck I heard what sounded to me like an awful boost leak, when i would punch the throttle the leaking noise would instantly stop(it made almost like a suction noise, like someone putting there hand over the end of a vacuum). So I parked the truck and figured I'd drive it later and see if it did it again, well the noise continued to come back. If I have the truck in nuetral and raise the rpms up to around 1600 the leaking noise instantly appears and my rpms drop 300-400. So I decided to pull it in the shop(heated) and see if I could find the source of the problem. I didnt find anything out of the ordinary so I started it up and the noise did NOT appear. But the next morning the noise came back and ever since then its been getting worse it seems. It doesnt matter if I drive it for 15mins or 2 hours, the noise is still there. the waste gate moves as it should and my vacuum lines are all in good shape. The problem seems to be related with temperature. Im thinking exhaust back pressure sensor? Any ideas or advice? I work for a dealership (chrsyler, dodge, jeep.... I know I know but they put me thru school) and I know how they work so I rather not take it in to a ford dealership.
It is the EBPV causing the issue and is normal. Do you have low power until the engine starts warming up?

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post #3 of 12 Old 11-23-2011, 05:59 AM Thread Starter
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I have low power all the time now because of the issue. Even when the truck is warmed up it still does it. That cant be normal can it?
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post #4 of 12 Old 11-23-2011, 06:07 AM
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I have low power all the time now because of the issue. Even when the truck is warmed up it still does it. That cant be normal can it?
Nope, not normal. Sounds like it's sticking closed. Is it a really loud hissing noise? There is also an EBP sensor on the front of the engine and a tube that connects to it. The sensor could be bad or that tube could be full of carbon or cracked causing an issue.

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post #5 of 12 Old 11-23-2011, 06:24 AM Thread Starter
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very loud hissing noise. I can get the noise to stop for a few seconds if I punch the throttle but then it reappears
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post #6 of 12 Old 11-23-2011, 06:55 AM
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There are a couple of things you can do: You can disable the EBPV by disconnecting the 2-wire weatherpack connector at the base of the turbo on the driver's side. This disconnects the EBPV solenoid (the solenoid is commanded open by the PCM to let oil into the actuator cylinder on the turbo pedestal and close the valve). If you want the valve still operational, another thing to check is the tube that runs from the front of the passenger side exhaust manifold, under the alternator, and up to the EBP sensor near the High Pressure Oil Pump (HPOP) Reservoir on the top front of the engine. The tube removes and snakes out from under the alt fairly easily. You can clean out the tube with some carb cleaner and wire rope chucked in a variable speed drill (just like a plumbing snake). Also clean out the little section of tubing left on the sensor and the sensor. Cheers!

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post #7 of 12 Old 11-23-2011, 08:23 AM Thread Starter
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one thing i forgot to mention was the day that it started making noise is also when it started to leak oil.... Could this be related to the noise im hearing?

Also, that tube you mentioned - i doubt it will come off in one piece, the one end looks pretty rusted on there....
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post #8 of 12 Old 11-23-2011, 08:40 AM
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one thing i forgot to mention was the day that it started making noise is also when it started to leak oil.... Could this be related to the noise im hearing?

Also, that tube you mentioned - i doubt it will come off in one piece, the one end looks pretty rusted on there....
Where is the oil coming from? Can you tell? You can buy a new tube.

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post #9 of 12 Old 11-23-2011, 09:22 AM Thread Starter
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under the turbo pedestal, but it doesnt seem to leak much anymore
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post #10 of 12 Old 11-23-2011, 09:35 AM
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under the turbo pedestal, but it doesnt seem to leak much anymore
I don't think that would cause the issue but what I would do is pull the turbo and pedestal, gut the pedestal of the EBPV and reinstall with new o-rings.

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