XSeries-forum

Hi

Just started getting turbo boost noises this week when easing off throttle or turning off engine.

And they are getting louder!

I do recall I was getting howling owl noises on a cold start up prior to this.

Is it a knackered turbo? Or a leak somewhere?

A leak in a hose be the first thing I’d check. It’s your cheapest option too.

Turbos going tend to sound a bit like an air raid siren with their whine as they spool up first thing and look for oil leaks as boost will be leaking if the pipe is leaking usually at the joins where o ring seals are worn and often at the intercooler ends .

Can't figure out where its coming from, will try a smoke test.

Egr cooler metal pipe ok ?

I had a tweak around with some the hoses last night to make sure everything was located, took it for smoke test and it was performed on boost system and EGR system, no leaks...

The boost noises were not audible on journey to garage this morning, however a little whoosh noise was heard on ignition turn off.

After a drive around today, the boost leak is back.....

Damn thats annoying its you cars little secret only you are it know lol

I got a second hand inlet pipe which came with seal onto turbo, was in good nick. Just fitted it, will test when out in car next.

When taking the engine acoustic cover off I did notice sweating on the front of the inlet manifold. A tell tail sign it coming from somewhere front of the engine....

Looks like it was the seal on the inlet pipe to turbo! Loud whoosh's gone!

Happy days , on the 35d that seal into the front of turbo is a pig to fit right , you cant see if its in or not and they often leak