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Noise before starting??

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Old Jan 7, 2013 | 08:25 AM
  #1  
Ferrellb07's Avatar
Ferrellb07
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Noise before starting??

Hello,

I have an 01 7.3 diesel. When I turn the key on (before i turn the engine over) I hear a loud grawling noise coming from under the hood. Maybe has something to do with the glow plugs?


It does it 100% of the time, every time I turn the key on. I'll turn the key on, wait a second, hear a weird grawling noise from under the hood, then wait another second and the glowplug light goes off. I then start up with no problems. What could this be? The truck starts and runs fine, but I sure would like to know what the noise is. My previous truck, 00 7.3, did not do this.

ideas?
 
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Old Jan 7, 2013 | 08:38 AM
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79schaefer
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My 2001 does the same thing, and I have a V-10. I dont remember my 99 doing it. It is coming from the driverside.

Steve S.
To many to list.
 
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Old Jan 7, 2013 | 08:45 AM
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yes it seems like its coming from the drivers side. I just assumed it had something to do with the glow plugs. I never would have thought a gas truck would do it. Hmmmm...
 
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Old Jan 7, 2013 | 09:15 AM
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Its the ABS module motor doing a test , My 03 does it every morning when I turn on the key.
 
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Old Jan 7, 2013 | 09:55 AM
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Mine does the same. It is the vacuum pump for the ESOF.
 
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Old Jan 7, 2013 | 10:08 AM
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If the growl is a short burst (~1 second), it is the ABS you are hearing. It descends in pitch and is very short.

The vacuum pump will run longer and is a more consistent pump sound.
 
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Old Jan 7, 2013 | 10:09 AM
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Originally Posted by Rudiak
Mine does the same. It is the vacuum pump for the ESOF.
I dont think so because mine is a gas motor and gas motors dont have vacume pumps.
 
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