Strange whine under the hood - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 22 (permalink) Old 10-15-2012, 10:58 PM Thread Starter
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Strange whine under the hood

Recently my truck's been making a strange whining/whistling noise when it's running. It's more pronounced than turbo whistle, but it's very intermittent. Not intermittent like a wheel bearing creak-creak-creaking, just that in comes and goes unpredictably (though more so at idle). It always starts off low and finishes at a higher pitch then just cuts out and makes no strange noises at all like nothing is wrong.

If I'm just idling and it starts to whine I can sometimes get it to "wind up" and stop by goosing the throttle, but then it just comes back again a few seconds later. It makes the same sound cruising at 100kph also, it will start to whine, then speed up and increase pitch, then just cut out. No engine RPM change or speed change at all.

It started doing this back at the beginning of April, but I changed the oil and that seemed to cure it. I drove the truck daily through to the end of june, then it sat for a while undergoing some serious drive-line and running gear repairs, got it back on the road in late august and now the whine is starting again.

I'm still new at diagnosing things like this, but if it were inside the engine then it seems to me the noise would me far more constant and fluctuate with every RPM change. And there seems to be no loss in power. And since new oil "fixed" it then it's got to be something that gets engine oil. I'm not sure how the vacuum system works, but does the vacuum pump get oil from the engine?

If anyone has dealt with this before I'd like to hear about it.

Thanks

1996 F250 XLT, 4x4, 5 speed, LuK clutch, scsb, manual hub conversion, 265/75R16 Wrangler Territories, Tymar intake

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post #2 of 22 (permalink) Old 10-15-2012, 11:08 PM
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Re: Strange whine under the hood

Does the sound come out of the exhaust? or does it sound like its driven by the belt?

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post #3 of 22 (permalink) Old 10-15-2012, 11:30 PM
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Re: Strange whine under the hood

Maybe try unplugging the EBPV.

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post #4 of 22 (permalink) Old 10-15-2012, 11:43 PM Thread Starter
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Re: Strange whine under the hood

The sound does not come out of the exhaust, I hear it right in front of me when I'm driving. When it was first happening in the spring I thought it was an idler pulley on it's way out, so I tried lubricating them a bit. That did nothing. Then I changed the oil and it stopped, so I didn't pursue it. I will unplug the EBPV and see if that has any effect.

1996 F250 XLT, 4x4, 5 speed, LuK clutch, scsb, manual hub conversion, 265/75R16 Wrangler Territories, Tymar intake

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post #5 of 22 (permalink) Old 10-16-2012, 12:02 AM
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Re: Strange whine under the hood

the ebpv is right in front of you and does sound weird.....

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post #6 of 22 (permalink) Old 10-16-2012, 01:11 AM Thread Starter
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Re: Strange whine under the hood

I looked for the ebpv wires this evening and for the life of me I can't find the connection. What I did find is that my valley is full of diesel. I'm suspecting the fuel pump. I did run the truck for about 10 minutes and I didn't hear any of the whining. Maybe I bumped something when I was crawling around on the engine.

Just for clarification, what does a properly functioning ebpv sound like? I wouldn't know a good from a bad one, this is my first psd.

1996 F250 XLT, 4x4, 5 speed, LuK clutch, scsb, manual hub conversion, 265/75R16 Wrangler Territories, Tymar intake

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post #7 of 22 (permalink) Old 10-16-2012, 01:49 AM
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Re: Strange whine under the hood

When it is working properly it will be a hissing noise.

EBPV is plug on turbo pedistal base.

Could your whine be from a power steering pump or another pulley?
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post #8 of 22 (permalink) Old 10-16-2012, 02:32 AM
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Re: Strange whine under the hood

Does it go away when you push in the clutch? My clutch has been whining ever sense I got a fuel leak. I push the clutch in and it gos away until I release it.

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post #9 of 22 (permalink) Old 10-16-2012, 01:26 PM
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Re: Strange whine under the hood

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Originally Posted by psdmike View Post
Does it go away when you push in the clutch? My clutch has been whining ever sense I got a fuel leak. I push the clutch in and it gos away until I release it.
Fuel has gotten between the engine and tranny and has de-lubricated the throwout bearing.

To the OP - do you hear it right when you start the engine? If so, try running it BRIEFLY without the serpentine belt on. If the sound goes away, it's either the belt or one of the objects it turns.
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post #10 of 22 (permalink) Old 10-16-2012, 01:36 PM
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Re: Strange whine under the hood

Quote:
Originally Posted by ontwowheels View Post
The sound does not come out of the exhaust, I hear it right in front of me when I'm driving. When it was first happening in the spring I thought it was an idler pulley on it's way out, so I tried lubricating them a bit. That did nothing. Then I changed the oil and it stopped, so I didn't pursue it. I will unplug the EBPV and see if that has any effect.
Sounds like a belt or an accessory.

BTW you can Not Lube a sealed bearing and that is what everything has

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