Acceleration whining

[br3nton]

I have this strange problem that when the accelerator is in 20-30mm the car whines. The further I push it in the louder the whine gets. The noise doesnt depend on rpm.

I've tried it at different speeds and gears and noise is always the same at the same points of the accelerator depth.

Any help would be appreciated.

 

[br3nton]

Seems like i was wrong with about the noise not depending on revs.
The noise will only happen above 2000k rpm.
Now im paranoid it will be the turbo

Oh and btw its definitely not the turbo whistle id rather hear.
It kinda sounds like a bearing not spinning properly

 

[nathand22]

is it a zd30? if it is i would be looking into a new turbo cartridge or a whole new turbo because if it does crap its self it will throw shrapnel up into the motor because there is no intercooler to catch the pieces, obviously if that happens you are up for way more than just the cartridge. according to berrima diesel its not that uncommon for the hitachi - ht12-19d turbos that are on the d22 navara with the zd30 motor. not sure where you are from but here is a link for an idea of what the cost will be if you do have to go down that road. Online Store - Denco Diesel & Turbo

 

[br3nton]

Yeah it is a ZD30.
Im from Melbourne
Im gonna take it down to nissan for a look ASAP
Just wondering whats the cost of getting a cartridge replaced?
And also any idea why this would have happened?

 

[nathand22]

Yeah it is a ZD30.
Im gonna take it down to nissan for a look ASAP
Just wondering whats the cost of getting a cartridge replaced?
And also any idea why this would have happened?

how many km's has it done?

my old d22 started doing it at around 350thousand but it got written off before it craped itself.
where do you live? nsw? if you are i can give you the phone numbers of some diesel mechanics that i spoke with and that were able to show me some examples from old units.
you will have to excuse my terminology while i try and relay what i was told by a couple of different people. apparently there could be a couple of reasons, 1 is that the bearings flog out for what ever reason (old oil, carbon build up or what ever) which causes excessive play in the turbine which then allows the turbine to hit the outer housing or the back plate,( this is probably the screeching noise i could hear ), with this the main shaft snaps just behind the turbine, in turn throwing the end of it and the turbine (which is now braking up into pieces) up into the head and taking your wallet with it.
most people seem to think it was simply a matter of time before they do it some go around 100thousand km and some will outlast mine (which as i said had done 350) but there seem to be more go between 100 and 200 thousand km's. i had my egr blocked off and changed oil every 10 000km with out fail but it still screeched it head off towards the end of its life but i was happy with 350 000km with no other probs so i just chalked it up to wear and tear but if it had only done 100 or less i wouldnt of been so happy
any way hope you have been able to understand what i was trying to say.

 

[bods]

i wouldn't take it to nissan. look in the yellow pages for a diesel specialist near you, they will have more of an idea than nissan would. good luck with it

 

[br3nton]

Well its got a little under 120k on the clock.
Im Melbourne but I got a number off my uncle for his diesel mechanic so hopefully he can sort it out.
I only brought the car about a month ago so this hurts a little bit but **** happens.
I recently blocked off the egr so hopefully that helps in the future.
Just need to get this sorted out then get back to some mods

 

[Dave]

Car fitted with a turbo timer ?

My stock turbo has over 200,000km's. Minimal shaft play but I am pretty sujre its starting to leak oil.

I have a better one in the shed though to go on.

Check the turbo and see how much play there is in the bearings.

 

[navara05]

where does it sound like its coming from mine does it and it comes from the middle of mine transfer back area
still trying to work mine out to

 

[nathand22]

Car fitted with a turbo timer ?

My stock turbo has over 200,000km's. Minimal shaft play but I am pretty sujre its starting to leak oil.

I have a better one in the shed though to go on.

Check the turbo and see how much play there is in the bearings.

dave have you checked the 4 small allen head bolts at the back of the turbo? mine started leaking oil because they came loose and 1 actually fell out, causing air to leak out which sounded like a hose leak. anyway i have since seen two others with oil leaks and when we checked the bolts as sure as **** they were loose. you wiil need to cut an allen key down so it fits in the gap.
nath

 

[br3nton]

The noise was coming from the engine bay im pretty sure.
Ive just dropped it off at the mechanics.
His gonna lock it up for me over the weekend and look first thing monday so i should have some news by monday.
Ill be sure to post what the problem is/was

 

[BOOGZ STR]

I'm gunna keep an eye on this thread, pretty sure my nav is suffering the same disease

 

[Navara_noob]

what was the problem?

 

[Killswitch]

How did this end? My ute's doing the same thing.

 

[Killswitch]

- The whistle I hear is only when driving, can't hear it when revving her up in the driveway.
- Happens in every gear and only over 1800 rpm.
- only hear it under acceleration, it stops as soon as you back your foot off.
- and no sound when the revs spike up changing down through the gears.
- sounds like its coming for behind the dash.

Having said that can it be the turbo..??

ZD30 with 62000km and snorkel, no EGR mod or boost gauge.

Have read all the info on this site and have checked turbo and dump pipe bolts, inlet hoses and vac lines.

any other tips...????

 

[joshman]

- The whistle I hear is only when driving, can't hear it when revving her up in the driveway.
- Happens in every gear and only over 1800 rpm.
- only hear it under acceleration, it stops as soon as you back your foot off.
- and no sound when the revs spike up changing down through the gears.
- sounds like its coming for behind the dash.

Having said that can it be the turbo..??

ZD30 with 62000km and snorkel, no EGR mod or boost gauge.

Have read all the info on this site and have checked turbo and dump pipe bolts, inlet hoses and vac lines.

any other tips...????

Do have a 3" exhaust as well? Would be a turbo whistle by what you describe.

 

[Killswitch]

No 3" exhaust.
I've ruled out the turbo....it's coming more from the driver side. I'm thinking it's an intake, EGR leak or something.

 

[simonk8]

Sounds like an egr / boost leak. A mate hade the same problem. You mentioned you recently did the egr mod? If so check for leaks or replace the gaskets on the egr valve and the pipe that goes from the egr valve to the inlet manifold.

 

[Old.Tony]

I'd guess a boost leak through either the EGR mod or through the intercooler.

Was someone on here that had a strange whistle sound under acceleration and it turned out to be the intercooler which had the two halves crimped together and the crimping came loose (pretty sure it was on here, since I don't go many other places at all).

 

[Killswitch]

Got mine sorted today, there was a leaky flange at the lower end of the EGR pipe.
Thanks for your help.