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Old 01-18-2014, 05:59 AM
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Cold Start/Buzzing Clicking Sounds

Okay guys, I'm not sure how too really describe what I hear when I start my truck, that's why I'm not sure how too search the subject.

But here it goes, sometimes when stating my truck I don't hear anything from under the hood, but sometimes I hear like a buzzing or a fast clinking sound from under the hood, does that make any sense??

Is that the glow plug relay????

Or course I can't get it too happen when I get my wife too start the truck and I'm under the hood it's random at doing it.
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Old 01-18-2014, 06:29 AM
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On top of the pass side fenderwell (under the hood) is a black, round-ish Vacuum Pump. See if it's not just that
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Old 01-18-2014, 10:59 AM
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Quote:
Originally Posted by NoRalPh View Post
On top of the pass side fenderwell (under the hood) is a black, round-ish Vacuum Pump. See if it's not just that
What does it do?? That might be the sound
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Old 01-18-2014, 11:06 AM
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Because a diesel doesn't really produce good Vacuum (it would, but there's no throttle plate to "pull" against) most of them have some sort of pump. Vacuum is used to control Heat/AC doors and the Auto Hubs in our trucks so, we need a source. Small leaks often mean that, after sitting for a time, that pumps often runs when you first turn-on the Key...
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  #5  
Old 01-21-2014, 11:55 AM
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Quote:
Originally Posted by NoRalPh View Post
On top of the pass side fenderwell (under the hood) is a black, round-ish Vacuum Pump. See if it's not just that
You NAILED IT!!!!!!

Truck was making that sound so I popped the hood, and sure enough it's that little pump
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