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milawilliams77

Navara Diesel Power Loss Whistling Noise

My 2012 Nissan Navara diesel is giving me grief. Check engine light's on, power's way down, and the throttle response is appalling. Sometimes it even stalls! Fuel consumption's shot up too. I'm also hearing a weird whistling and loud hissing when I accelerate. It's only done 59152 km. Any ideas before I set fire to it? I suspect a boost pressure issue, perhaps the wastegate valve. I’ve checked all the hoses I can see, and they seem okay, but I’m no expert.

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)

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?

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