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what is this buzz?

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Old Mar 1, 2008 | 12:20 PM
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what is this buzz?
when i turn the key on and wait for the glowplugs the engine buzzes then the abs makes some noise too. what exactly is buzzing in the engine? injectors?
 
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Old Mar 1, 2008 | 01:28 PM
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Its the fuel pump.
 
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Old Mar 1, 2008 | 01:53 PM
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no, the fuel pump is under the driver's seat, this noise is in the engine compartment
 
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Old Mar 1, 2008 | 01:54 PM
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vacuum pump
 
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Old Mar 1, 2008 | 01:59 PM
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its not the vacuum pump either, its coming from the engine like the injectors are buzzing, don't tell me no one elses does this
 
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Old Mar 1, 2008 | 02:04 PM
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Have you popped the hood and let someone else start while you listen
 
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Old Mar 1, 2008 | 02:56 PM
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this is before the engine starts, i can pop the hood, turn the key on, and for about five seconds the engine buzzes, the abs buzzes, and the vacuum pump comes on. i am just wondering what in the engine is doing the buzzing. do the injectors cycle before starting?
 
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Old Mar 1, 2008 | 03:44 PM
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Its normal so why are you so worried about it?
 
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Old Mar 1, 2008 | 05:01 PM
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Injector cycling prior to startup is normal.
 
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Old Mar 1, 2008 | 05:44 PM
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mine does it, I don't know what it is either
 
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Old Mar 2, 2008 | 12:32 AM
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Does it only do it when your "Wait to start" light is on?
 
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Old Mar 2, 2008 | 08:26 AM
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Originally Posted by cartmanea
Its normal so why are you so worried about it?
no one said i was worried about it, just curious what it was.
 
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Old Mar 2, 2008 | 10:54 AM
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glow plugs...
 
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Old Mar 2, 2008 | 01:46 PM
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Originally Posted by slowmans
glow plugs...
Electricity doesn't make noise, it has to be something mechanical.
 
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Old Mar 2, 2008 | 03:14 PM
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its injectors, take your truck in and have them do an updated flash. your just hearing the injectors cycling, the new flash eliminates that and dose inductive heating instead.
 
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