1300 rpm sound - Chevy and GMC Duramax Diesel Forum
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Old 03-26-2010, 06:20 PM   eBay Motors  #1 (permalink)
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1300 rpm sound

I have an 06 LBZ which at 1300 rpm makes a hissiing/sucking sound.
It does not make the sound at 1350 or above or at 1250 and below.
I had it in to GM and they replace a tube which I couldn't get a description on and that was supposed to fix it. Well no fix and sound still present.
One of the technicians claimed it was not harmful to the turbo and it was a spooling sound. it sounds almost metal. but no trouble with performance and the vehicle doesn't smoe nor does it use a lot of fuel.
I have a Diablosprt on the engine set at 85 HP tune.
Any ideas?
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Old 03-26-2010, 06:28 PM   eBay Motors  #2 (permalink)
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You will be told to fill out your sig. I'll say it now so you wont be badgered to do it later. The hissing sounds like your turbo. The vanes must be changing position making a hissing or jet engine type sound. It's normal. If any one else has any ideas I'm sure they'll chime in
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Old 03-26-2010, 06:52 PM   eBay Motors  #3 (permalink)
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Fill out my sig?? at the risk sounding silly i am not sure what you are talking about.
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Old 03-26-2010, 07:00 PM   eBay Motors  #4 (permalink)
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See the info about my truck under my post, thats a sig (signature for short). On the left of the page you will see a box that says navigation. go to the heading "user CP" Scroll down it will be on the left hand side under settings "Edit signature" go in an put all the info about your truck. take mine for example. year, body style, upgrade, color etc
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Old 03-27-2010, 08:53 AM   eBay Motors  #5 (permalink)
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OK I edited my Sig....
Now back to my question any takers I sure would like some helpe
The sound is quite prominent at times and didnt start until about a year ago.
At first I thought it was the heater/AC motor. I had that replaced but noise still prevails.
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Old 03-27-2010, 08:56 AM   eBay Motors  #6 (permalink)
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its just your turbo the LBZ's like all newer models have a variable geometry turbo with vanes thet open and close...they are closed at idle making the hiss sound they all do it unless you tune it to open the vanes some at idle (which takes an edge or efilive)
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Old 03-27-2010, 08:58 AM   eBay Motors  #7 (permalink)
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does it sound kind of like a jet?
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Old 03-27-2010, 09:20 AM   eBay Motors  #8 (permalink)
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It Does not Sound like a Jet more like a sucking grinding squeaky kind of sound. Its been doing this for about 8 months or so now and no engine damagor turbo failure has occured.
Oil is Clean and Not poerformance loss.
Just this annoying sound at 1300 rpm
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4 inch Exhaust
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Old 03-29-2010, 03:58 PM   eBay Motors  #9 (permalink)
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Well I disconnected the DiableSport Tuner and test drove it the sound is still there and as before only at 1300 RPM. It is quite noticeable.
Any takers?
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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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Old 04-24-2010, 04:53 PM   eBay Motors  #10 (permalink)
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I have similar sounds at 1300 rpm. the best way i can describe mine is it sounds like a few pennies in a glass jar that is muffled. if you can try to imagine it. i have had other people try to hear it and it takes a bit of driving to hear it. it also makes a similar sound when i shut it down. im not sure if this is the same problem going on but it drives me nuts, so i tend to get worse MPG to avoid the sound. haha any thoughts or help would be great. i was thinking it might be a belt or pulley maybe a barring. i also have pretty bad vibrations felt in the cab at idle in park and drive.
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