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XTrail76 Profile
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Date Registered: 08-2011
TOTAL POSTS: 69
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Intermittent cracking noise coming off boost


hi there

okay i have recently started hearing this noise, it sounds like a bit of a crack, like an exhaust touching something or a boost relief valve with a stuck spring, or even a concentrated diesel engine rumble in one spot. only happens when i take my foot off the gas pedal, and it is intermittent. sometimes coming off small boost it'll do it, most times coming off full throttle nothing is heard.

car has done just over 2000 kms, has the provent fitted. doubt the noise is from the provent.

thoughts?
3/Oct/2011, 1:46 pm Link to this post Send Email PM   Send Private Message Blog
 
Army1 Profile
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Date Registered: 11-2010
TOTAL POSTS: 11
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Re: Intermittent cracking noise coming off boost


I have heard the same noise and thought it could be the movement of the VGT vacuum operated vane actuator snapping back with sudden RPM changes.
6/Oct/2011, 1:53 pm Link to this post Send Email PM   Send Private Message Blog
 
XTrail76 Profile
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Date Registered: 08-2011
TOTAL POSTS: 69
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Re:


this noise, comes and goes... it's very very intermittent

happens more when cold... though one day after a half an hour drive it came up again, then after hearing it twice or so, it disappears again..

the other theory is a relief valve somewhere..
7/Oct/2011, 2:22 pm Link to this post Send Email PM   Send Private Message Blog
 
nickv1980 Profile
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Date Registered: 08-2012
TOTAL POSTS: 13
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Re: Intermittent cracking noise coming off boost


For the first time ever i heard mine make this noise today ... i dont generally get on the gas pedal hard for the first 5 mins of driving but today i gave it a bit of extra juice the car was cold and in between gear changes or feathering the throttle from 0 to half it would intermittently make a cracking sort of a sound but once the car warmed up it was gone ..

Being fairly experienced with turbo cars its defiantly slight turbo compressor surge due to the VGT /wastgate being a tad lazy to react sometimes but after it was warm no noise at all. emoticon

Last edited by nickv1980, 28/Nov/2012, 12:40 pm
28/Nov/2012, 12:32 pm Link to this post Send Email PM   Send Private Message Blog
 
race777 Profile
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Date Registered: 06-2012
Location: qld
TOTAL POSTS: 12
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Re: Intermittent cracking noise coming off boost


did that noise sound like repeating blows of air, after letting off the accelerator about 2000 rpm

---
sam

2009 t31 diesel xtrail
9/May/2013, 5:10 pm Link to this post Send Email PM   Send Private Message Blog
 
konazz Profile
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Date Registered: 08-2012
Location: Canberra, ACT
TOTAL POSTS: 479
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Re:


I'm pretty sure i get a Bzzzzzz (getting softer) noise every time I switch the car off. Definitely coming from the upper section of the engine bay on the passenger side. It sounds like something to do with air...

---
Michael K
2012 X-Trail Series IV Diesel TS
Member X-2600 (C)
Mods: Pedders Lift Kit, Bash Plates, 16" X-trail Steel Rims, 235/70/16 A/T Tyres, Heavy Duty shock absorbers
9/May/2013, 10:46 pm Link to this post Send Email PM   Send Private Message Blog
 
Toddyh03 Profile
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Date Registered: 08-2011
Location: Lalor Park, NSW
TOTAL POSTS: 1663
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Re: Intermittent cracking noise coming off boost


The buzz is the tuber boost solenoid. Nothing to worry about. Just releasing pressure.

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Toddyh X-2048 (c)
New: Challenger
Old: 2010 T31 Diesel modified
My XTrail
10/May/2013, 6:27 am Link to this post Send Email PM   Send Private Message Blog
 
race777 Profile
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Date Registered: 06-2012
Location: qld
TOTAL POSTS: 12
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Re: Intermittent cracking noise coming off boost


i can only easily hear my noise happen when under load at 1700 to 2000rpm you let off the accelerator, and the noise is very distinctive 5-6 progressively less noisy "chuzz" sounds and that noise is still made well after it's up to operating temperature. no noise at all when not under load, ie to repeat in driveway i have to stall it up to that rpm and let off to hear it . any thoughts on what is causing this, i thought something on the turbo, but i'm not that familiar with these little xtrail engines, i do know that this sound has only been happening for the last maybe month.


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sam

2009 t31 diesel xtrail
11/May/2013, 11:31 am Link to this post Send Email PM   Send Private Message Blog
 
Toddyh03 Profile
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Date Registered: 08-2011
Location: Lalor Park, NSW
TOTAL POSTS: 1663
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Re: Intermittent cracking noise coming off boost


It's just the turbo spooling down. 1700-2000rpm is just where the turbo starts to pick up. Thats why you hear the noise at those revs.

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Toddyh X-2048 (c)
New: Challenger
Old: 2010 T31 Diesel modified
My XTrail
11/May/2013, 11:49 am Link to this post Send Email PM   Send Private Message Blog
 


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