I know these are the hardest to identify, but SOMETIMES when I let off the throttle, the turbo makes a strange whistle that sounds like a bird exhaling. It doesn't do it all the time, just occasionally. Mainly when I have been sitting at idle for a while and then it goes away. Sometimes it comes back, but only briefly. I know that a BOV can sometimes make a sound in a passenger car application, just not sure if it is the same in a big truck. Any thoughts?
Bird Whistling Sound?
Discussion in 'Trucks [ Eighteen Wheelers ]' started by Gazoo, Dec 2, 2007.
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its your blow off valve on your turbo. Lets off excess psi making a woooosh sound kinda. Some blow off valves make a high pitch whistle. It all depends on the truck manufacture on what type of turbo setup they choose.
Ex: med/hard acceleration then let off and you will hear that whistle or what wooosh sound. I love hearing that noise on turbo'd big blocks
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