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Humming under the hood

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  #1  
Old 01-13-2016, 09:06 PM
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Humming under the hood

I have a humming under the hood of my 01 powerstroke. It happens before start. I think it is coming from the area of the starter solenoid relay.
What might the humming be?
 
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Old 01-13-2016, 09:10 PM
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Vacuum pump, most likely.
 
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Old 01-13-2016, 09:11 PM
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sounds like the vacuum pump located on the passenger fender have someone start the truck while you stand on that side with the hood open
 
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Old 01-13-2016, 09:28 PM
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My son says there is 2 different hums from that area. 2 when switch is on and 1 after it is started. I can't hear the 2nd but my hearing isn't the best.
 
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Old 01-14-2016, 12:48 AM
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glow plug relay is on that side just above the valve cover,could be that,starter solenoid is on top of the starter,are there any problems or just curiosity about the noises
 
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Old 01-16-2016, 01:46 AM
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I have a problem now. I charged the battery and when I went to start it a puff of smoke came up from the area of the solenoid. I haven't tried anything since then. Could it be the solenoid went bad?
 
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