Is my turbo about to die? 2007 LBZ w/7000 miles

[ccole]

Hello all-
Quick question concerning my 2007 with 7,000 babied miles. I have noticed that immediatly after I shut the engine off and walk around the front side of the vehicle, I can hear a rumbling noise, that slowly tapers off. I am almost sure this is the turbo coming to a stop after the engine is turned off. I have never noticed this sound before, with this truck or any of my previous duramax's. It sounds kinda like rocks rolling around inside a tin can, that slowly diminishes. Is my turbo bearings on their way out? What do you dmax guru's think?

Thanks in advance!!

[hapaschold]

my 06 lbz makes the same noise...about 9k on odo...i dont think it s anything to worry about....least hope not!

[DieselMonk]

my 07 classic is doing the same sine new. now i have 2600km on it. I don't think it is the turbo, sounds more like a air condition compressor to me or the coolant fan.

[mvn]

One of the first things I noticed on my '07 LBZ was that sound. It has done it since new and it now has almost 8,000 km on it. I never noticed it on my '03 LB7.

[Scooby]

I hear the same noise on the 07 LBZ I just got yesterday. It has 247k on it, I was thinking the turbo might be bad, but now I dont know.

[spongebob]

Its the turbo winding down..its a good sound

[rapidoxidationman]

Scooby, I'll bet it is the air conditioner coolant pressure relieving itself through the evaporator valve. I hear it on my '05 as well.

Turn off your AC, go for a drive (without the defrost setting putting air on the windshield because IIRC that defaults the AC to ON) and see if you still hear the sound on shutting down.

[Scooby]

Its not the refrigerant equalizing in the system. I know that sound well. I havent been running the air either. Its the turbo rumbling. Sounds like it needs grease. I'll look for the grease fittings. (Just kidding.) I ve been trying to get my Ultragage to work in this truck so I can watch boost and other parameters, but so far I cant get it to power up from the OBD port. Also my lighter outlet doesnt work. I wonder if a fuse is blown.

[a5150nut]

Its not the refrigerant equalizing in the system. I know that sound well. I havent been running the air either. Its the turbo rumbling. Sounds like it needs grease. I'll look for the grease fittings. (Just kidding.) I ve been trying to get my Ultragage to work in this truck so I can watch boost and other parameters, but so far I cant get it to power up from the OBD port. Also my lighter outlet doesnt work. I wonder if a fuse is blown.

On these newer trucks they have a panel where they ganged the turbo zerks along with the ones for the muffler bearings and the blinker fluid filler neck. Just look for the blinking LED's to locate it!

[Scooby]

I found the cig lighter fuse blown under the hood. Replaced it and now OBD port has power, and ultragauge works. I haven't looked at all the gages it can display, but I did see boost psi and fuel rail pressure.