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Ive started hearing this loud whiny noise coming from my engine bay (2001 GU, 3.0L turbo diesel) but having trouble locating the where its coming from or what it might be.
It started happening one morning after i may of turned her off too quickly the day before when i was rushing around for a wedding. The next morning it was super faint as i drove home then loud the next time i started her up in the late arvo.
When idle she sounds fine. When i give it a bit of throttle the sound comes in and gets louder as i rev harder. I havent driven her since noticing the noise as i was scared the turbo was the issue.
I pulled the intake before the turbo to check and the turbo seemed fine. Then started the washing detergent and water trick trying to fine leaks. Only found the one behind the turbo which spews bubbles while idling. Bubbles dont get worse when given revs so im not sure if this is the issue causing the noise.
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