Barking sound when let off the gas pedal

[Matthias Nagel]

Hi,

I’ve a barking sound when I let off my gas pedal. Mostly in low speed and always when the engine has to pull. Never when I coast. Went to my mechanic and he says it’s most likely the turbo but has little knowledge about the diesel engine and referred me to a diesel shop.
I read changing the turbo is a hassle if it is the turbo.

Anyone has or had the same issue and can give me some advise?

Thank you

 

[Tremper126]

Sounds to me like it’s the turbo relieving pressure as it’s designed

 

[TC Diesel]

VGT Turbos Do not bark for long, If the back pressure is that great they will be a final BOOM looming in the near future.
Never heard of the 3.0VM Honeywell Turbos barking (Honeywell is the primary share holder in Garrett Turbos).

 

[Matthias Nagel]

Barking might be the wrong word for it. It does sound more like a gasping and you can feel vibration on the passenger side seat. My apologies .

 

[F. P. Thompson]

Mine will make that type of sound in some situations also. I think it is some kind of unloader valve as my wife HHR-SS with turbo has made a similar sound occasionally the whole time we have owned it.

 

[Matthias Nagel]

Just went to the mechanic and he confirmed that the noise is back pressure.