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· Premium Member
2003 ZD30 Di Patrol (The rare Gold one)
25,770 Posts
No it's all the time
If it is not too loud and there all the time I would think it was the sound of the turbo spooling up and pushing a heap of air.
If it sounds like a slipping fan belt gone mad then its a gasket.
The Nissan gaskets are multi layer stainless steel items that are perfect whistles they fail. Just like a reed on a flute etc.
When they first fail. The noise will go away once it gets hot and expands. After a while it will be noisy all the time.
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