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3.9 roars, then doesn't

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Old Sep 15, 2009 | 03:42 PM
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Default 3.9 roars, then doesn't

It's hard to explain so i added a 5 second video from this morning, but sometimes when I start my truck, it has a horrible ROAR to it and it won't go much above maybe 2500 without sounding like it wants to throw a rod. I shut it off and started it a second time, and it still roared...finally on the 3rd start it sounded normal again.

roar:
[youtube]pi8DoI8ndvU[/youtube]

This is how it normally sounds:
[youtube]cbKeb16L18A[/youtube]

At the end of that second video, here's what the loud bang was- I bottomed out on the tires.

 

Last edited by magnethead; Sep 15, 2009 at 03:44 PM.
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Old Sep 15, 2009 | 05:12 PM
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Without watching the video (at work). It sounds like the clutch fan. They usually make more noise when the engine is first stared then it loosens up and quiets down until it gets hot enough to engage the fan for more cooling.
 
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Old Sep 15, 2009 | 05:14 PM
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Originally Posted by Hahns5.2
Without watching the video (at work). It sounds like the clutch fan. They usually make more noise when the engine is first stared then it loosens up and quiets down until it gets hot enough to engage the fan for more cooling.
that's what i'm hoping..but it's very inconsistent of when it does it...maybe once or twice a month....
 
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Old Sep 15, 2009 | 05:51 PM
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i maybe heard my fan on my v6 kick in 4 times this past summer.. from my understanding the cooling system on our trucks does too good of a job. either way. i would say its safe to say thats your fan clutch kicking in. dont sweat it
 
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Old Sep 15, 2009 | 06:28 PM
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Originally Posted by f0x672
from my understanding the cooling system on our trucks does too good of a job.
Well if you consider the radiator is like 30" square and gets 100% airflow.... well yea. lol.
 
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Old Sep 15, 2009 | 09:46 PM
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After listening to the video it does indeed sound like the fan.
 
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Old Sep 15, 2009 | 09:59 PM
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Sounds like mine in the morning ive heard lots of daks and other vehicals make that sound.
 
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Old Jan 31, 2010 | 12:50 PM
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Mine just recently started making that sound maybe once every two months on cold mornings and stops by the time I make it down the street.
Is this something I should worry about? Does this mean I need to replace the fan clutch?
 
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Old Jan 31, 2010 | 01:36 PM
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99% sure its the clutch fan. You're not the only one to hear it. Many dakotas (and other vehicles for that matter) do it. Not a big deal.


Hahah oh wow, I don't miss it taking 11 seconds to go 0-60.
 
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Old Jan 31, 2010 | 02:37 PM
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Thanks bpark
And I am jealous, I wish I had the money for a v8
 
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