Vibration at 1200 RPM under truck - Chevy and GMC Duramax Diesel Forum
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Old 07-22-2010, 02:31 PM   eBay Motors  #1 (permalink)
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Vibration at 1200 RPM under truck

Hey all,

I am new to the diesel word and have a question. I have a 2007 classic with the LBZ in it. At 1200 RPM there is a constant rattle/vibration from under the truck, a few guys here at the FD said it may be something loose in the exhaust or a turbo bearing. Anybody had anything like this or have any ideas? Thanks for the help.
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Old 07-22-2010, 02:45 PM   eBay Motors  #2 (permalink)
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does it sound like a metal-on-metal rattle or kind of like a grinding??

i have it too, i can't figure it out
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Old 07-22-2010, 03:04 PM   eBay Motors  #3 (permalink)
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Yea metal on metal, I have had a couple of guys here at work under it and we can't figure it out.
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Old 07-22-2010, 03:18 PM   eBay Motors  #4 (permalink)
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Sitting still or while underway?
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Old 07-22-2010, 03:32 PM   eBay Motors  #5 (permalink)
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Do you have an aftermarket exhaust? If so it might be the cat delete pipe against the T-Case brace. If not, check the heat shields on the turbo and on the downpipe. I had a problem with mine rattling
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Old 07-22-2010, 03:37 PM   eBay Motors  #6 (permalink)
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It is while it is sitting still, it has a stock exhaust on it and from what we can see the shields are tight
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Old 07-22-2010, 03:48 PM   eBay Motors  #7 (permalink)
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Seeing and reaching your hand down or up between the firewall and the downpipe are two different things. Take off the passenger fender liner. This way you can check everything at once, with ease. Might be a manifold shield as well
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Old 07-22-2010, 07:27 PM   eBay Motors  #8 (permalink)
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Thanks for the info I will try that.
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Old 07-24-2010, 09:56 AM   eBay Motors  #9 (permalink)
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i have the same exact problem if i am correct...you start your truck,and u can hear a metal to metal rattle for a little,u rev it slightly and at certain spots in the rpm range it will rattle then quiet down then rattle,even when im driving if i give it slight throttle you will hear it alittle..i dont think its something wrong with the turbo or motor,i think its a shield of exhaust rubbing..this has JUST HAPPEND after bringing it to the shop to fix my egr Cooler leak...im guessing they left a shield a little lose or fiddeld with the exhaust..it has to be that.drives me crazy sometimes...not a safety or motor issue so its not the first thing on my priority list.hahaa
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Old 07-24-2010, 10:10 AM   eBay Motors  #10 (permalink)
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That sounds just like it, yea I agree I think it may be a shield let me know if you find out or I will post if I find it out. Thanks for the help.
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