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XC90 D5 Boost whine

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Old Apr 29th, 2019, 09:22   #1
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Location: Medway
Default XC90 D5 Boost whine

The car in question 2006 XC90 D5 Facelift, having covered as good as 300,000 miles. Itís wanted for nothing over its whole life, a folder bigger than my Mrsí posterior full of history.

Over the last few months there has been a seriously annoying noise that appears with boost, but we (owner, myself, and each of the 2 garage itís been into cannot find where itís coming from.

It comes at around 1500 revs, but only when under load. Not when sat on the driveway. On the driveway it never comes no matter how hard itís revved. The only way to induce it is to have your foot hard on the brake, and rev to 2000 when it comes again.

Smoke test has produced no results.

Replacement boost pipe at the rear of the engine (turbo exit to under engine solid section) - no change

Intercooler changed - no change

Turbo changed (removed and sent to east midland turboís for recon) - again no change 🤬

So today after the turbo was reinstalled and the noise still present, before reaching for the petrol can and matches I got the owner to do the brake pedal and Rev thing while I was over the engine, under the engine, all around the engine... the noise is definitely coming from the top nearside of the engine!!
Itís not a noise like a split boost pipe usually gives, though thatís not to say there isnít a split somewhere...

Has anyone else ever suffered this?? Has anyone got any ideas on where else be looking?
The sound is like youíd expect from an air leaks from a solid section of pipe rather than any of the flexi pipes, itís definitely coming from the turbo area. If it werenít for the fact that I have been outside the car while the owner has been doing the brake and accelerator trick I would have thought it was a Caliper sticking and giving a whine to the brakes, that kind of sound.

Any questions welcome as weíre really starting to scratch our heads now...
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Old Apr 29th, 2019, 19:57   #2
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Last Online: Today 21:53
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Location: Emsworth,hants

Hi have you connected a vacuum gauge to the vacuum pump, as at 1500rpm the vacuum engine mounts switch off, using the tcv mounted on the air box, is the brake booster servo ok, as doing a smoke test on the inlet/boost system will not show if there is a leak there,
also when you did the smoke test what pressure did you go up to, as some smoke testers are low pressure,,
and you need to do the test at a high pressure 10-15+ psi, as it is only making the bad sound under load/boost
when doing a high pressure test undo the oil filler cap , as there is a seal that can start leaking behind the flywheel,
also are the low pressure turbo inlet pipes ok
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