buzzing sound from motor after key off - 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 02-09-2012, 07:59 PM   eBay Motors  #1 (permalink)
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buzzing sound from motor after key off

ok so a friend of mine has an 06 lbz, built trans, efi live, stock motor

now he just got a 200+ race tune put on it, now after he shuts the truck off or turns the key on and then back off, after about 3 sec there is a buzzing sound for about 30 sec

if you put your hand on top of the intake tubing you can feel it buzzing, to me it sounded more like it was coming from the turbo right under the tubing, but with the engine and turbo being warm i couldnt really put my hand anywhere to feel for it

anyone have any ideas what this could be?

he said it started to happen only after he put the race tune on the truck, never did it before then
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Old 02-09-2012, 08:04 PM   eBay Motors  #2 (permalink)
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not sure if the lbz has the intake throttle valve like the LMM trucks.. but mine does that at shut down which is the intake throttle valve cycling... does it sound like this in the video?

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Old 02-09-2012, 08:09 PM   eBay Motors  #3 (permalink)
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similar sounds but its constant for about 30 sec or so after you shut it off, doesnt "cycle" like that does
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Old 02-09-2012, 08:23 PM   eBay Motors  #4 (permalink)
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Quote:
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not sure if the lbz has the intake throttle valve like the LMM trucks.. but mine does that at shut down which is the intake throttle valve cycling... does it sound like this in the video?

LMM Duramax Shut-Down - YouTube
Please explain more about the intake throttle valve. Mine does that and I never really knew why?
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Old 02-09-2012, 08:27 PM   eBay Motors  #5 (permalink)
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Please explain more about the intake throttle valve. Mine does that and I never really knew why?
honestly, i cant tell you what it's function is.. i always thought it had something to do with the regen process but idk...

as far as i know it does this at shut down the truck will run a test on it to see that it works... no clue on its actual function tho.. someone please school us? lol
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Old 02-09-2012, 08:30 PM   eBay Motors  #6 (permalink)
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My throttle valve is gone as well as my EGR and mine still makes the buzzing sound but only after I cycle the key and not start the truck. I too thought it was the throttle valve but now I have no clue..........

The sound I am referring to is not in the video. It is more of a high pitched buzz and it is continues constant for about 4 seconds...........

It has done it for years so I don't worry about it though and have heard other trucks do it as well..................
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Old 02-09-2012, 11:57 PM   eBay Motors  #7 (permalink)
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glowplug module?
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Old 06-30-2012, 10:04 PM   eBay Motors  #8 (permalink)
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My truck just started making a loud buzzing sound at shut down? Not the cycling sound in the video above. My truck has always done that. But tonight I went and washed her up and went for a bit of a cruise. When I shut it off it made a loud buzzing noise. About 2-3 seconds long. Reminded me of a school buzzer. Any ideas????
It made the noise after that when I cycled the key without starting it. I let it sit for 10 min. and started it and shut it off. No buzzing. Just the normal cycling sound.
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Old 07-01-2012, 09:04 AM   eBay Motors  #9 (permalink)
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Bump.
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2007.5 GMC 2500HD Z71 SLT
20x9 Ultra Predators, 285 55R20 Nitto Terra Grapplers, EFILive Autocal DSP5 (ATP) 5" Diamond Eye SS w/muffler, Diamond Eye Downpipe, Transgo jr. Isspro Ev2 gauges, PCV reroute, EGR blocked, Cognitto UCA's, pitman/idler arm supports, Bilstein 5100's, MA Stainless tierod sleeves, Billet grille, Roll N Lock, Line-X, AFE stage 2 intake, Chrome tow hooks, WeatherTech visors, Spyder LED Tail lights, Cree reverse lights, B&W Turnover ball, 1500 tailgate spoiler, Loadlifter 5000 airbags, wirelessOne

2013 Forrest River Wildcat Extralite 293 REX
SUPERBOWL CHAMPS!!! GO SEAHAWKS!!!
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Old 07-01-2012, 08:29 PM   eBay Motors  #10 (permalink)
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2013 Forrest River Wildcat Extralite 293 REX
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