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Discussion Starter · #1 ·
I have a 2016 GMC canyon. Getting a really high pitched whine sound. It seems to be coming from the turbo. Bent fin? I live in the NW and doesn't freeze much. How should I troubleshoot before taking it to a mechanic? If I need a new turbo , where would I source it?
 

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I have a 2016 GMC canyon. Getting a really high pitched whine sound. It seems to be coming from the turbo. Bent fin? I live in the NW and doesn't freeze much. How should I troubleshoot before taking it to a mechanic? If I need a new turbo , where would I source it?
Pull the inlet hose on the turbo and inspect the impeller...
 

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Pull the inlet hose on the turbo and inspect the impeller...
Check where the down pipe connects to the turbo. Your looking for bolts that have completely fallen out or loose. If that’s the case then that’s your boost leak! The fix that GM has is new bolts, gasket and a new high temp lock tight.
 

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Discussion Starter · #4 ·
Check where the down pipe connects to the turbo. Your looking for bolts that have completely fallen out or loose. If that’s the case then that’s your boost leak! The fix that GM has is new bolts, gasket and a new high temp lock tight.
Would it be possible to have a boost leak without any noticable loss of power?
 

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Would it be possible to have a boost leak without any noticable loss of power?
Yes, it’s such a slight leak that’s why it’s whining. You won’t notice a power loss, maybe a very tiny loss. Early on this problem is always misdiagnosed by replacing the turbo. This happened 3 times with my truck until they figure out what was really causing the problem. It’s a simple fix. How many miles do you have?
 

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Discussion Starter · #6 ·
Yes, it’s such a slight leak that’s why it’s whining. You won’t notice a power loss, maybe a very tiny loss. Early on this problem is always misdiagnosed by replacing the turbo. This happened 3 times with my truck until they figure out what was really causing the problem. It’s a simple fix. How many miles do you have?
70k
 

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Discussion Starter · #7 ·
What is the best way to check it out. Can't really access the top of the downpipe from below and tough to see from above. Does the wheel well need to be undone?
 

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What is the best way to check it out. Can't really access the top of the downpipe from below and tough to see from above. Does the wheel well need to be undone?
Yeah it sucks…… but there’s only two bolts holding flange together. Put it on lift or grab a creeper and a flash light, look for soot. If in fact that is the problem, get new everything especially the flange gasket don’t mess around. Be aware that little bastard is razor sharp and razor thin. Mine was easy to detect the bolt closes to the exhaust manifold (heat) was always gone, see if that helps you.
 
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