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ILSilverado

3.0 L Diesel. Anyone Else Notice This??

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I’m hearing a breathing wheezing gasping sound coming from the engine just after shut down for about. 5-8 seconds.

Edited by ILSilverado

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IDK for sure but perhaps an air or vacuum leak that's only audible during turbo spindown?  Have the dealer check it out since you're most certainly still under warranty.

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I don't have this particular engine, but my Colorado Dmax makes whirring, clicking and cycling noises after shutdown.  Been doing it for two years.  

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my 2.8 Duramax Canyon did it and my current 3.0 Sierra does it also.  I've hear people say its a turbo cooling process, a DEF pump purging process and other things.  In any case, I believe it to be a normal sound.  I had a 4.0 v6 Taco that made a noise after shut down that was also considered common and normal.

Edited by Time2gofishing1980
does. not do
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6 minutes ago, Time2gofishing1980 said:

my 2.8 Duramax Canyon did it and my current 3.0 Sierra does it also.  I've hear people say its a turbo cooling process, a DEF pump purging process and other things.  In any case, I believe it to be a normal sound.  I had a 4.0 v6 Taco that made a noise after shut down that was also considered common and normal.

Thanks!

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3 hours ago, ILSilverado said:

I’m hearing a breathing wheezing gasping sound coming from the engine just after shut down for about. 5-8 seconds.

6.6L does a bunch of that at shutdown too.

 

Turbo vanes, def pump, egr valve....all normal.

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1 hour ago, redwngr said:

6.6L does a bunch of that at shutdown too.

 

Turbo vanes, def pump, egr valve....all normal.

Thanks new to modern diesels here 😀

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Might be fuel pressure reduction as well?  These things are pumping massive PSI of fuel. 

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