I have noticed, when it's cold, shortly after I get going down the road when I let off the throttle a little I hear this odd sound. It sounds almost like a compression release or extremely quiet exhaust brake sound for about 2 sec. or about 5 putters. Sounds similar to the powersmokes compression release when towing but alot quieter. I just started noticing it about 1.5 months ago. It is coming from, at best guess, the bottom of the engine towards the firewall on the driver side. Anybody got any ideas?

 

is your turbo barking?

 

No it is not.