Whistling noise in dd15

[giorgi]

My 2018 cascadia dd15 engine makes small whistle zzz noise when accelerating or let off gas pedal, any guess? Video attached thanks

 

[Mike]

That was a very faint noise, barely heard it.

Does it happen on all roads? Is weather a factor? How long have you been hearing it?

 

[Electric Chicken]

Almost sounds like electromagnetic interference to me.

 

[giorgi]

That was a very faint noise, barely heard it.

Does it happen on all roads? Is weather a factor? How long have you been hearing it?

Its rpm depending, hearing every gear after around 1200rpm, no weather doesn’t matter

 

[tommyh]

I had a new turbo once that had a whistle when I accerlated or when I let off


how old is that turbo?

I had a c12 back then but that don`t sound like my turbo did

 

[mndriver]

Sounds like a blown boot or some kind of boost leak.

 

[giorgi]

Sounds like a blown boot or some kind of boost leak.

Just found small coolant leak from hose connected to engine block can be that or more like air leak?

 

[giorgi]

I had a new turbo once that had a whistle when I accerlated or when I let off


how old is that turbo?

I had a c12 back then but that don`t sound like my turbo did

Not sure how old it is bought few months ago, truck is 2018, doesn’t look like new though

 

[mndriver]

Just found small coolant leak from hose connected to engine block can be that or more like air leak?

Nope, it will be a boost leak somewhere.

Since it’s a dd15, when you hear the turbo whine in the exhaust, start spraying with windex all of your air piping from the turbo to the charge air cooler to the intake manifold and you’ll find one of the hoses around a clamp likely blowing bubbles.

You can use any soapy solution, even homemade water and dish soap works, windex is handy because you should already have a bottle or you can really enjoy the show and get the bubble solution for kids and put it in a spray bottle.