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CHEDBALLZ
New Orleans Saints Fan
South Central LA
Member since Dec 2009
17473 posts

Help Me Diagnose Noise Coming From My Truck Please
2008 Sierra, 185,000 miles 4.8l

Short YouTube Video

It does speed up a little when I accelerate.


Update. Not the tensioner or idler pulley. I'm thinking water pump.
This post was edited on 1/14 at 5:33 pm


Elusiveporpi
LSU Fan
Below I-10
Member since Feb 2011
2035 posts

re: Help Me Diagnose Noise Coming From My Truck Please
Im thinking have some type of flap or strap that must have fell down and is getting hit by your fan blade or belt. i would turn the engine off and see if anything is contacting the rotating parts in the belt area


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all_over_it
LSU Fan
Montegut
Member since Feb 2013
490 posts

re: Help Me Diagnose Noise Coming From My Truck Please
Check your starter.... had a noise on my 2011 Yukon turned out the bendix was not retracting


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Chuker
LSU Fan
St George, Louisiana
Member since Nov 2015
7544 posts

re: Help Me Diagnose Noise Coming From My Truck Please
I kept waiting for the beat to drop


Shexter
Prairieville
Member since Feb 2014
6766 posts
 Online 

re: Help Me Diagnose Noise Coming From My Truck Please


185,000 miles - check the belt tensioner and the bearings on any other idler pulleys.








cajuncarguy
On the road...Again!
Member since Jun 2013
2418 posts
 Online 

re: Help Me Diagnose Noise Coming From My Truck Please
Looks like you think it was comin g from front of engine. It could very well be the tensioner. Try turning the AC off and on to see if there is a change in the sound. If so techs sometimes use a stethoscope with a specialized pointed end to listen for noises. Not sure if it will get to tensioner with engine running though.


CHEDBALLZ
New Orleans Saints Fan
South Central LA
Member since Dec 2009
17473 posts

re: Help Me Diagnose Noise Coming From My Truck Please
Sounds like a marching band.


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Shexter
Prairieville
Member since Feb 2014
6766 posts
 Online 

re: Help Me Diagnose Noise Coming From My Truck Please
It's a quick and easy fix if it's just one of those pulleys. That's where I'd look first.

It sounds a lot like this video Failing Belt Tensioner Noise

and this video https://www.youtube.com/watch?v=AC5k1_3ih6M



44Bogger
Louisiana Tech Fan
Beauregard
Member since May 2014
131 posts

re: Help Me Diagnose Noise Coming From My Truck Please
It doesn't sound as expensive as this noise.

Truck noise


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CHEDBALLZ
New Orleans Saints Fan
South Central LA
Member since Dec 2009
17473 posts

re: Help Me Diagnose Noise Coming From My Truck Please
Thinks that's where ill start.

Going to change my idler pulley, belt tensioner and serpentine belt, if it ain't that I'll being it to someone.


Chuker
LSU Fan
St George, Louisiana
Member since Nov 2015
7544 posts

re: Help Me Diagnose Noise Coming From My Truck Please
seems like if you could just pop the belt loose you could spin/inspect the idler and tensioner without replacing them. Though maybe they are due for a change anyway.


all_over_it
LSU Fan
Montegut
Member since Feb 2013
490 posts

re: Help Me Diagnose Noise Coming From My Truck Please
I took mine to 3 different places and they could not find anything.... I found it by jacking up front end and loosening one of the starter bolts while the truck was running... bolts loose no noise bolts tight noise pulled starter found this LINK


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20
CHEDBALLZ
New Orleans Saints Fan
South Central LA
Member since Dec 2009
17473 posts

re: Help Me Diagnose Noise Coming From My Truck Please
That's what I'm thinking, I'll take the belt off and see if I can find anything. Then change what I need too. If I average 35 MPH I would have 5200 hours on it. That's a lot of run time.


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11
300HOGSLAYER
LSU Fan
south of I10
Member since Nov 2014
292 posts

re: Help Me Diagnose Noise Coming From My Truck Please
Take the serpentine belt off and see if the noise goes away, if it does spin the pulleys by hand and see which one is noisey. If it still does it, it may be a wiped out lifter and camshaft.
This post was edited on 1/14 at 4:31 pm


CHEDBALLZ
New Orleans Saints Fan
South Central LA
Member since Dec 2009
17473 posts

re: Help Me Diagnose Noise Coming From My Truck Please
You can run your engine without the serpentine belt?


cajuncarguy
On the road...Again!
Member since Jun 2013
2418 posts
 Online 

re: Help Me Diagnose Noise Coming From My Truck Please
Yes. But not too long.


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30
all_over_it
LSU Fan
Montegut
Member since Feb 2013
490 posts

re: Help Me Diagnose Noise Coming From My Truck Please
Did you figure it out?


CHEDBALLZ
New Orleans Saints Fan
South Central LA
Member since Dec 2009
17473 posts

re: Help Me Diagnose Noise Coming From My Truck Please
Mechanic thinks it the Flex Plate. He needs to out it on the rack to make sure though.


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