1300 rpm sound - Page 2 - Chevy and GMC Duramax Diesel Forum
06-07.5 LBZ & LLY Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect

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Old 04-25-2010, 10:37 AM   eBay Motors  #11 (permalink)
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I replaced my Idler pulleys as well as the tensioner. Thinking this was my problem with the noise, but the noise remains. Always consistent 1300 rpm only at about 20 - 40 mph. It is quite annoying. I have not experienced any performance issues nor any failures. To really enhance the noise driving in an alley or alongside a hiway barrier really make it audible.
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Old 04-25-2010, 10:54 AM   eBay Motors  #12 (permalink)
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I have that very same noise in my 06 LBZ
have been all over my truck trying to find
it... Glad i am not the only one. But it is
realy annoying
By the way great site I have been doing
a ton of reading, this is my first post.
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Old 04-25-2010, 01:09 PM   eBay Motors  #13 (permalink)
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I believe I have this sound as well seems very noticable at shutdown of the truck. Similar switching noises at idle too. I have a 07 LBZ.
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Old 04-25-2010, 10:38 PM   eBay Motors  #14 (permalink)
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More to add. The sound I get at 1300 rpm is never heard when the engine is cold but (could be due to engine being louder trying to warm up) once it gets warm and I baby it for the mpg it is brutal. I can hear it best when shifting 1-2 and 2-3 being gentle. It's definatly a muffled quick rattle. I have vibration in the cab ( may not be related) and can hear a similar sound while in park at idle or in drive but seems to away when I let of the break to go. Still have no clue where tho. I tried having the wife rev to 1300 in park. No luck with that.
I'm desperate for a fix on this one guys. Losing sleep. Could this be a TQ issue?
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Old 04-26-2010, 12:34 PM   eBay Motors  #15 (permalink)
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I dont experiance any vibration...ever. But yes it is only present after the engine is warm. I tried it with the belt off and it is still present. Same paramters, 1300 rpm ... 20 - 40 mph. I don't get the sound at idle though nor at shutdown.
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Old 05-05-2010, 06:01 PM   eBay Motors  #16 (permalink)
 
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i have noise that sounds like someone stretched the mouth of a ballon and letting air out slowly
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Old 06-29-2010, 01:53 PM   eBay Motors  #17 (permalink)
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I have this same sound ... WHAT IS IT !
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Old 06-29-2010, 05:14 PM   eBay Motors  #18 (permalink)
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Quote:
Originally Posted by FmFuller View Post
i have noise that sounds like someone stretched the mouth of a ballon and letting air out slowly
Check the boot at the lower left side of the inner-cooler and might as well check all others. They get loose and let boost excape. Also check for wear hole in the boost tube at the PS hose-- the hose may contact the boost tube and wear hole.

Also-- at the top of the forum-- click on user and fill out your information in the signature-- No one knows what you drive-- but YOU! It helps when you ask a question.
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Old 07-03-2010, 08:29 PM   eBay Motors  #19 (permalink)
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Quote:
Originally Posted by jc1843 View Post
Check the boot at the lower left side of the inner-cooler and might as well check all others. They get loose and let boost excape. Also check for wear hole in the boost tube at the PS hose-- the hose may contact the boost tube and wear hole.

Also-- at the top of the forum-- click on user and fill out your information in the signature-- No one knows what you drive-- but YOU! It helps when you ask a question.
I tried the usercp options and have the signature filled out and the box checked, but it wont show up.
any ideas
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16" RaceOne Mags & Bridgestone Revo II
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4 inch Exhaust
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Old 07-03-2010, 08:32 PM   eBay Motors  #20 (permalink)
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Originally Posted by Storm59 View Post
I tried the usercp options and have the signature filled out and the box checked, but it wont show up.
any ideas
well look at that now it works
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06 LBZ Silverado LT - Allison
Bullydog GT Tuner
K&N Intake
16" RaceOne Mags & Bridgestone Revo II
LED Dash Mod
Projector HID Lights High And Low with 4 light Mod
Rigid Dually LED Fog & Driving Lights
4 inch Exhaust
Coming Soon:
4 inch lift
Bullydog Pyrometer
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