milawilliams77
Navara Diesel Power Loss Whistling Noise
Summary of the thread
A 2012 Nissan Navara diesel experienced power loss, poor throttle response, increased fuel consumption, and unusual whistling and hissing noises during acceleration. The suspected cause was a boost pressure issue, possibly related to the wastegate valve. After checking visible hoses, the problem persisted, leading to a workshop visit where the wastegate valve was confirmed as faulty and subsequently repaired, resolving the issues.
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4 comment(s)
milawilliams77 (community.author)
Yeah, it does seem worse when it's cold. Whereabouts is the pressure sensor located? And what readings should I be looking for?
janaheld64
It's near the throttle body, usually on the intake manifold. But honestly, given all those symptoms, I'd say it's probably time for a workshop visit. Could be a turbo issue, related to the wastegate valve. It's a pain to diagnose properly without the right gear. If left unresolved the problems could extend into the intercooler.
milawilliams77 (community.author)
I think you're right. I took it to the shop today. You nailed it - wastegate valve was buggered! Cost me 860€ to get it sorted. Runs like a dream now, though!
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NISSAN
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NAVARA
janaheld64
Sounds familiar. I had similar symptoms on my Navara a while back: reduced power, weird noises... Is it worse when the engine is cold? Have you checked the pressure sensor?