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Nissan Navara D40 - Engine sounds different than before (lemm.ee)

submitted 1 year ago by [email protected] to c/mechanicadvice

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I might be just hallucinating but I feel like my Navara sounds different than when I bought it. There used to be this very typical turbo diesel humming noise when accelerating and switching from first to second grear like you can hear here for example. Basically the same sound every diesel truck makes when accelerating. I feel like I can't hear it anymore, however the truck feels and runs just normally. Atleast I think it does.

I'm assuming that sound is coming from turbo because I only hear diesels sounding like that. How would I go about making sure everything is working properly when there's no other symptoms that the lack of that sound?

Here's what mine sounds like.

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[–] Everythingispenguins 1 points 1 year ago (1 children)

Okay so those are absolutely other symptoms. So that sounds a lot like a fuel delivery issue. The cold running that goes away with warmer temps is classic fuel delivery issues. So first I would put a new fuel filter on it and check your water filter if you have one. If that doesn't work you need to check injector pressure and spray pattern. Because it could be low fuel volume, low fuel pressure or a bad injector. This is something that you should address soon because if it is a leaky injector that could cause premature failure of your engine.

That all assumes that it is not bad compression and you need a new engine but that is pretty unlikely.

[–] [email protected] 1 points 1 year ago* (last edited 1 year ago)

I have replaced the fuel filter recently aswell. It seems to be running fine since I replaced the SCV but I can't say for sure yet because I haven't driven much lately. I feel like what helped the most was the new SCV aswell as the fuel system cleaner. There likely is a leaky injector because there's oil/diesel on top of the engine cover which seems to be coming from the injector closest to the firewall but I'm not sure. It's not leaking enough that you could see it while it's running. I've been meaning to clean it and see where it's coming from but I haven't gotten around to it and it has been looking like that ever since I bought it.

Another thing I noticed was oil/diesel on the clamp of the pipe that's coming from turbo and going to the intercooler as well as some inside the throttle body but not much and it looks pretty clean otherwise. I think I might try the turbo cleaning stuff from the same brand (forte) of which fuel system cleaner I used aswell. That's what the guy at the parts store recomended aswell when I got the new SCV.