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4.8l Engine noise

4.8l Engine noise

Postby scubiesteve [OP] » Dec 31 2011, 4:11am

I have a 2008 1500 Silvy with 53,000 miles and the engine is making a clunking/squealing noise. I know what your thinking belt or pulleys. I replaced the drive serpentine belt along with the idler pulley. But that didn't solve the problem, so I took both the A/C and drive belts off and started the truck and it is still making this noise. So now I'm stumped, I took the wife's stethoscope to see if I can pin point the noise, to me it gets louder in the bottom end, I tried each head but couldn't get anywhere near the firewall since the truck is lifted. The sound does quiet down after the engine has warmed up but you can still hear it if you are listening for it. I bought and extended warranty with the truck that covers pretty much everything that isn't normal wear and tear. But before taking it in I wanted to get some thoughts on what you guys might think it is and to see if ya'll think the warranty will even cover it or if it's just a simple fix (which I highly doubt). Here is a link to the video of the engine noise http://youtu.be/MRZ8asi3YVU This video is taken from the driver side wheel well.
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Re: 4.8l Engine noise

Postby ASTE25 » Dec 31 2011, 9:39pm

It does sound like a bottem end noise. I have seen cracked flexplates make a noise similar to that. When they crack it almost sounds like a rod knock.
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Re: 4.8l Engine noise

Postby scubiesteve [OP] » Jan 02 2012, 5:16am

It goes to my local mechanic tomorrow and if he thinks the stealership will fix it under warranty or my extended warranty I'll take it to GM. I'll post whatever the problem is.
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Re: 4.8l Engine noise

Postby tsduke » Jan 02 2012, 5:23am

If you have warranty why not start with a dealer?
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Re: 4.8l Engine noise

Postby scubiesteve [OP] » Jan 02 2012, 5:25am

because if they dont cover it under warranty I have to pay for a $85 diagnostic fee, my mechanic is $30 and is going to tell me everything that needs to be fixed and what he recommends be fixed.
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Re: 4.8l Engine noise

Postby Z71Silvy » Jan 02 2012, 5:30am

The only other noise I could think of would be if the exhaust started rubbing up against anything around the y-pipe. Easy enough to check - if its not that, it sounds like a trip to the dealer is the best bet.
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Re: 4.8l Engine noise

Postby scubiesteve [OP] » Jan 02 2012, 5:34am

I checked the exhaust it's coming from the bottom end of the engine or the bellhousing.
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Re: 4.8l Engine noise

Postby ASTE25 » Jan 02 2012, 9:34pm

What did you find out?
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Warn 9.5 TI winch and a Warn Trans4mer brush guard
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Re: 4.8l Engine noise

Postby scubiesteve [OP] » Jan 03 2012, 4:01am

They had to keep it overnight, they agreed it is not a normal noise but they want to hear it first thing in the morning when the engine is cold. So I should know tomorrow some time what's making that sound.
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Re: 4.8l Engine noise

Postby ASTE25 » Jan 03 2012, 4:07am

So, did they give you something to drive in the meantime?
Jordan
2005 Victory Red Silverado Z-71 4X4 regular cab
5.3 / 4L60E
Warn 9.5 TI winch and a Warn Trans4mer brush guard
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