Hissing from Turbo

Submitted: Tuesday, May 31, 2005 at 07:49
ThreadID: 23443 Views:1772 Replies:10 FollowUps:6
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Dear All

I have a 2005 GU 3.0L. Went I am accelerating and the motor is climbing from 1500rpm to 2500rpm I can hear a hissing noise from the general direction of the turbo. Is this normal? I have a mate with a 2000 GU and he says that he does not have the same noise. Could it be that the waste gate is stuck open? I have checked all the clamps on the intake pipes and through the inter-cooler and found nothing strange. The motor still pulls well.

Thanks

Angus
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Reply By: Troll83 - Tuesday, May 31, 2005 at 08:13

Tuesday, May 31, 2005 at 08:13
It could just be the air being sucked in like there is no tomorrow....do you have a k&N air filter....I have heard that sorta noise on normal cars with that air filter in....?? My thoughts anyway
AnswerID: 113674

Reply By: Member - Banjo (SA) - Tuesday, May 31, 2005 at 08:37

Tuesday, May 31, 2005 at 08:37
My post 20917 may be of interest - you may not have the same but it seems that IF the engine is struggling for any reason to get enough inward airflow, these noises can develop from a variety of places as the air is pulled in through any available passage. Maybe a short test run without the filter etc ?
AnswerID: 113677

Follow Up By: Member - Banjo (SA) - Tuesday, May 31, 2005 at 14:45

Tuesday, May 31, 2005 at 14:45
Much learned comment below - I just reiterate that I could have sworn on a stack of VB slabs that my turbo was going to blow- it sounded like a whipper snipper, snipping it's head off - came in under load etc while accellerating - but no.....not the turbo - was all to do with restricted air inflow on the filter / snorkel side... but.....mMay well be the gas outflow side as suggested.....let us know but !
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FollowupID: 369802

Reply By: DEANO WA - Tuesday, May 31, 2005 at 09:31

Tuesday, May 31, 2005 at 09:31
I have a 2003 3.0 and the noise sounds like a high pitched whistle?? only on and just after start up when accellerating. I have been informed it is the EGR valve and am organising replacement through warranty
hope this helps
AnswerID: 113687

Follow Up By: Farside - Tuesday, May 31, 2005 at 10:11

Tuesday, May 31, 2005 at 10:11
Deano

Thanks for the reply. The noise is more prevalent once the engine has warmed up.

Where is the EGR valve?

Thanks

Angus
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FollowupID: 369759

Follow Up By: DEANO WA - Tuesday, May 31, 2005 at 10:51

Tuesday, May 31, 2005 at 10:51
not sure but is exhaust return so must be near turbo (pre or post)
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FollowupID: 369764

Follow Up By: 3.0turbob - Tuesday, May 31, 2005 at 11:05

Tuesday, May 31, 2005 at 11:05
EGR valve is on the drivers side, near the back of the motor just about where the head joins the block. Has electrical wires and connector protruding from it.
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FollowupID: 369768

Reply By: Disco200Tdi - Tuesday, May 31, 2005 at 10:40

Tuesday, May 31, 2005 at 10:40
Check that all you intercooler hose clamps are tight. Any place for air to escape will cause the turbo to whistle. Also check for any holes at the same time.

I recently found a hole in one of my silicone intercooler hoses that made the turbo whistle, went away after fixing.

John D
AnswerID: 113692

Reply By: Member - Jeff M (WA) - Tuesday, May 31, 2005 at 10:52

Tuesday, May 31, 2005 at 10:52
Do you have a snorkel, very common to have air rushing sounds from the snorkel...
AnswerID: 113697

Follow Up By: Member - Glenn D (NSW) - Tuesday, May 31, 2005 at 16:23

Tuesday, May 31, 2005 at 16:23
Mine became heaps more noticable after fitting the snorkle and getting rid of that stupiud bit of rubber over the inlet.

The sound varies under load revs etc

Not sure if the 3.0 has variable vanes in the turbo though ?

Glenn.
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FollowupID: 369823

Reply By: lux - Tuesday, May 31, 2005 at 11:53

Tuesday, May 31, 2005 at 11:53
Hissing noise from the turbo means that it’s working. The turbo's impeller spins at extreme rev's, this makes a whistling noise when turbo kicks in with acceleration as the boost builds.
AnswerID: 113709

Follow Up By: DEANO WA - Tuesday, May 31, 2005 at 12:12

Tuesday, May 31, 2005 at 12:12
Lux, its not the sweet sound of a turbo screaming that we're talking about, this is a distinct 'problem' sound.
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FollowupID: 369779

Reply By: hoffy - Tuesday, May 31, 2005 at 12:11

Tuesday, May 31, 2005 at 12:11
Farside,
It's quite normal. Mine did the same and the Dealer told me it is the variable vanes in the turbo working at different angles dependent on load and acceleration.
If you try backing off the throttle a bit and then accelerating again you will hear the sound change.

Happy motoring,
Graeme.
AnswerID: 113712

Reply By: Michael O'Reilly - Tuesday, May 31, 2005 at 12:38

Tuesday, May 31, 2005 at 12:38
A loud squealing hiss like a deranged kettle and it could be the gasket in the pipe near the EGR valve. Did one up at Narrabri earlier this year. Mechanic there said the retaining bolts "fall out" of the GU's and the high gas pressures stuff the gasket, sometimes even warping the pipe. Prob needs a new bolt firstly and also maybe a new gasket.
AnswerID: 113717

Reply By: Paul.S - Tuesday, May 31, 2005 at 16:36

Tuesday, May 31, 2005 at 16:36
Some info,
A good mate of mine had some strange noises out of his GU 3.0. 12 months old Travelled 20,000k and let go. Nissan replaced short motor under warranty.
Have they still got problems their not telling us about???
AnswerID: 113756

Reply By: Member - toohey - Tuesday, May 31, 2005 at 17:04

Tuesday, May 31, 2005 at 17:04
gid'ay farside
mine starts the turbo whistle around about 3000revs under acceleration back off just a touch it stops,it still whistles at 3500 to 4000 same deal back off abit it stops,hold at any of these rev ranges not accelerateing no whistle,has been like this from new.my opinion is its air being sucked in under acceleration,i have a snorkel fitted with the cyclone pre cleaner removed.hope this info helps.regards toohey
AnswerID: 113759

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