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Duramax Third Generation: 2006-2007.5 (LBZ & LLY) Discuss the third generation (2006-2007.5 LBZ & LLY) of the 6.6L Duramax diesel engine & associated components. 2006 LLY engine discussion also belongs in this forum due to the similarities of the 2006 LBZ and the 2006 LLY. Engine related discussion ONLY.

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Old 02-09-2012, 09:49 PM   #1 (permalink)
squeaky3
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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 02-10-2012, 11:25 AM   #2 (permalink)
scattermax03
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its the vane solenoid resetting the vanes on the turbo

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Old 02-10-2012, 12:15 PM   #3 (permalink)
20052500HD8100
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Yep I know exactly what you are talking about. It is a very loud buzzing from the turbo area after shutting down the engine. It lasts for a good 20 seconds and is not normal.
It is being caused by an error in the tune -- most likely in the vane position & desired boost tables.
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Old 02-12-2012, 11:05 PM   #4 (permalink)
squeaky3
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ok thanks guys

i figured it was from the turbo and didnt think it was supposed to do that since it only started after he got the tune put on

ill have him talk with the guy that did the tune and see if they can get it sorted out
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recon cab lights
rest is stock........for now
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