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Discussion Starter #1
Hello All. I would appreciate any help and all input on a problem that recently started on my 09 GXP. I've noticed a rattling noise coming from my turbo at first start up after the car has sat overnight. I've read a few threads on ours and the Skys' forum that lead me to believe it's coming from the turbo's bushings telling me they are about to fail. The noise lasts for about 30 seconds then goes away supposedly due to oil pressure being forced into the bushings taking up the play. Would I be correct in this diagnosis? Is so, can the turbine be rebuilt/replaced or should I just replace the entire turbo? In either case will the ECM, etc have to be reprogrammed? The car has just over 28K miles on it, Has a GMPP tune and runs a DDMWerks Cold Air Induction system. I'm happy with the current HP, etc so not looking for an upgrade to the turbo if I have to replace. Any thoughts, input or guidance?:smile2: Rick:patriot:
 

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Talking completely out my A** here, but I would've thought that is the bearings were worn enough to rattle, you would get the dreaded dentist's drill sound of the blades scraping. A rattle sounds more like a bracket or similar.

Take that opinion for what it's worth, though.
 

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Discussion Starter #3
It's been my experience from working on motorcycles that a grinding sound has been typical of ball and roller bearing failure. I'm not sure of the type of bearings installed in the turbo but I have been lead to believe they are of the sleeve type. Again, I'm not sure. :confused::confused:
 

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Unless the thing was completely neglected or abused, I'd be hard pressed to think your turbo is going out at 28k miles.

Maybe a heat shield?

The cat converter on my N/A would do that when cold. A metallic "ring" inside of it would rattle around until it swelled enough from heat to keep from moving. The cat was failing at the time.
 

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Does it sound like a rock tumbler? I'm thinking its your CAI. I have the same issue at start. Let me see if I can get a vid and post it.
 

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Discussion Starter #6
Well, I checked the heat shroud and can confirm the noise is not coming from there. I also checked and tightened all the brackets I could find on the passenger side of the engine compartment. Everything seemed tight, (Thank you chickenwire and TS). It does seem to come from the front part of the turbo charger, the cold air intake side. I would think that if the turbo was failing the sound would be there all the time and not fade and disappear after about 30 seconds, fading as the engine rpm drops to normal idle from a cold start. It doesn't seem to return until the engine has sat and cooled for awhile, usually overnight. If I could figure out how to post a video with sound I would do so.:frown2::frown2:
 

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I'm pretty sure its your CAI. Trust me. To post a video, upload it to youtube, then post the link here, removing the "s" from the https://

Basically its the turbulence you have in the CAI...mine does exactly what you're talking about and it's done it for 7 years....
 

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I had my turbo rebuilt at a local shop. There are a lot of turbo repair shops now that turbos have become so popular. However, my rebuild was at 180,000 miles so I would look for another source of the rattle first.
 
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