Pressure Relief? - Ford Powerstroke Diesel Forum

 
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post #1 of 8 Old 07-23-2013, 05:20 AM Thread Starter
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Pressure Relief?

Is there an air pressure relief valve of some sort under the hood? Occasionally when leaving the parking lot of my apt complex I hear something that sounds like air pressure being relieved. The sound lasts about 1 second and sounds similar to the air brake pressure relief on an 18-wheeler.
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post #2 of 8 Old 07-23-2013, 08:00 AM
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There is some doodad on the driver's side engine fuse box by the fender next to the degass bottle. Not sure exactly what it is, but occasionally it buzzes and relieves some pressure.
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post #3 of 8 Old 07-23-2013, 11:04 AM
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I think that may be the ESOF vacuum pump. It should not make the noise of a blow off valve. At least I would hope it wouldn't.
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post #4 of 8 Old 07-23-2013, 12:14 PM
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ESOF? You are probably right, but what is ESOF?
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post #5 of 8 Old 07-23-2013, 12:22 PM
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Electronic Shift-On-the-Fly. It's for your your 4x4.
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post #6 of 8 Old 07-23-2013, 02:54 PM Thread Starter
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I'm not 4x4.
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post #7 of 8 Old 07-23-2013, 05:23 PM
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Then you will not have the ESOF pump.
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post #8 of 8 Old 07-23-2013, 05:45 PM
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Maybe check all of your to and from intercooler boots.

Is it possible for you to post a sound/video clip?
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