7.3 Sucking noise under light throttle

albertjcoutts · Dec 19, 2016

Hi guys,
My '00 7.3 is making a sucking noise when under partial throttle. When I 1st start the truck, it won't make the noise til it goes into high idle. Then you can hear it start to suck (the noise almost sounds like it's coming out the exhaust pipe). It will make the sucking noise on and off (1 second on, 1 second off, in a steady pattern) until the truck warms up. At that point, the sucking noise will be continuous. When driving the truck, it will make this noise once I touch the throttle (takes about a second to start after throttle, and starts quiet and gets louder, as if a valve is opening over 2 seconds time) until I either accelerate hard or get about 1500rpm.

The noise sounds like it's coming from the left, rear side of the engine bay (as looking at it). It's not my intake, nor my tune. Doesn't sound anything like an exhaust leak. I would think turbo but it boosts well and doesn't throw any codes.

One thing that was suggested to me was a leaky waste gate, which I'm going to replace anyway. But I still wanted to see what you all have to say.

Thanks!
AJ

PDT1081 · Dec 19, 2016

It's your exhaust back pressure valve. It puts a load in the engine to assist with warm up.

albertjcoutts · Dec 19, 2016

PDT1081 said:
It's your exhaust back pressure valve. It puts a load in the engine to assist with warm up.

Alright, that would explain it during high idle. But what about once it's warmed up? It will make the noise all the time while I drive, not just when it's cold.

ja_cain · Dec 19, 2016

albertjcoutts said:
Alright, that would explain it during high idle. But what about once it's warmed up? It will make the noise all the time while I drive, not just when it's cold.

Mine modulates the ebpv for a good while when ambient temps are low. It definitly does it till its at an oil temp of at least 130 to 140. Do you have a way to monitor oil temps?

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albertjcoutts · Dec 19, 2016

ja_cain said:
Mine modulates the ebpv for a good while when ambient temps are low. It definitly does it till its at an oil temp of at least 130 to 140. Do you have a way to monitor oil temps?

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No I do not, not yet at least

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dmd · Dec 19, 2016

What are the temps the truck is in? I mean if you are in CA it could be a problem, if
you are in ND then you have a few more months of this.

albertjcoutts · Dec 19, 2016

dmd said:
What are the temps the truck is in? I mean if you are in CA it could be a problem, if
you are in ND then you have a few more months of this.

I live in NEPA, right now it is 5°F outside. I bought the truck in Sept, noticed this noise about a month later

T_rider_0013 · Dec 19, 2016

Mine does that exact same thing I was told to take off the pipe from the ebp sensor to the passenger manifold and run some throttle cable threw it and put your drill on one end and turn very slow. Check for holes or cracks first. Than clean the the little hole on the manifold. They can very clogged I did this on my truck and it runs and idles a lot better. Hope this helps.

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albertjcoutts · Dec 19, 2016

T_rider_0013 said:
Mine does that exact same thing I was told to take off the pipe from the ebp sensor to the passenger manifold and run some throttle cable threw it and put your drill on one end and turn very slow. Check for holes or cracks first. Than clean the the little hole on the manifold. They can very clogged I did this on my truck and it runs and idles a lot better. Hope this helps.

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So I'm cleaning the pipe that I removed and the hole where it goes into th manifold?

Can anyone else confirm this will help?

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79jasper · Dec 19, 2016

Yes. And the sensor itself can become clogged. Just be careful. Don't poke too hard.

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albertjcoutts · Dec 19, 2016

OK, thanks!

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79jasper · Dec 19, 2016

You can also just unplug the ebpv Solenoid. That will stop it from coming on.

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albertjcoutts · Dec 19, 2016

79jasper said:
You can also just unplug the ebpv Solenoid. That will stop it from coming on.

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Being new to the Powerstroke (diesel in general), I'm not sure what that solenoid even does. Could you explain?

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79jasper · Dec 19, 2016

The Solenoid is the "controller" to the ebpv. It redirects oil pressure to force the valve closed.
The ebpv is supposed to help warmup, but many don't see a difference by unplugging it.

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albertjcoutts · Dec 19, 2016

79jasper said:
The Solenoid is the "controller" to the ebpv. It redirects oil pressure to force the valve closed.
The ebpv is supposed to help warmup, but many don't see a difference by unplugging it.

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So I see that I could purchase a "******" part for it. What benefit does the "******" give me over just unplugging (besides the obvious fact that there's less stuff clogging my exhaust)?

If I were just to unplug it, is the engine still going to pump oil into it, and would it still leak oil if it already does (which I have no idea, but w/ 224k I can probably assume it is)?

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albertjcoutts · Dec 19, 2016

Apparently that's a bad word

I can purchase a part that removes the butterfly, etc. ^^

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79jasper · Dec 19, 2016

The derete and non-ebpv pedestal completely gets rid of it.
You can diy it, but if I were to do it again, I would just buy it.

So maybe a slight reduction in EGT'S. About all you'll gain.

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albertjcoutts · Dec 19, 2016

Alright, thanks for the input

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T_rider_0013 · Dec 19, 2016

Some people I have talked to about this when it happened to mine... they also said you can disconnect the plug on air box which apparently will break circuit to the ebpv. I'm pretty sure if you unplug off the ebpv on the turbo pedestal it can throw a soft code but the truck will run like it should. I haven't had any issue with just unplugging the sensor on the air box

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