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Hey guys i'm looking for some help....my Z is out of warranty and im at 31k miles. At lower speeds ( Any help is greatly appreciated!!
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02-23-2014, 08:26 PM
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#1 (permalink) |
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Base Member
Join Date: Sep 2013
Location: detroit
Posts: 42
Drives: '09 370Z
Rep Power: 11  |
whining belt sounding noise at highway speed
Hey guys i'm looking for some help....my Z is out of warranty and im at 31k miles. At lower speeds (<50ish mph) my Z sounds normal, as in good exhaust noise and motor noise. Once I start to speed up and I am on the highway, i'm getting like a belt whining noise and its to the point where if i'm in 6th gear and give it just a little gas or even if i downshift to 5th to speed up a bit, I dont even hear the exhaust or motor, all I hear is a whining noise and it sounds terrible. Whats weird is that if I go through a puddle it seems to get worse...could this be a really bad wheel bearing issue or does it sound like possibly and intake problem?? Like i said im out of warranty and the dealership wants $120/hr
 Any help is greatly appreciated!!
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02-24-2014, 02:18 AM
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#3 (permalink) |
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Track Member
Join Date: May 2013
Location: Alpharetta, GA
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Drives: Airplanes
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Have you checked your supercharger?
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02-24-2014, 05:11 AM
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#4 (permalink) |
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Premium Member
 
Join Date: Nov 2010
Location: South Arkansas
Posts: 8,435
Drives: 2014 Challenger
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Take a passenger along for a ride and see if they can pinpoint the source.
As per DE.50, it could be the ECU (right side footwell). Could be the tires. I doubt it is a wheel bearing - they tend to have a "gritty" rumble/growl instead of a whine. Edit: could also be the fuel pump.
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Steering Lock Links - Search The370Z Bookmarklet - FSM @ NICOclub Mankind has progressed past the need for war but we haven't evolved that far. - NachoMahma Last edited by SouthArk370Z; 02-24-2014 at 08:26 AM. |
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02-24-2014, 10:06 AM
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#6 (permalink) |
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Base Member
Join Date: Sep 2013
Location: detroit
Posts: 42
Drives: '09 370Z
Rep Power: 11 |
i just did some research into what the ecu would sound like and from what I understand is that it would be a high pitched frequency noise. Mine is not like that. When i touch the gas or when i have cruise control on I dont hear exhaust or anything, I just hear like a belt noise.
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02-24-2014, 10:30 AM
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#7 (permalink) |
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A True Z Fanatic
 
Join Date: Jun 2010
Location: California
Posts: 10,709
Drives: 370Z T/S/N 6MT & XKE
Rep Power: 3842 |
Can the belt , fan be moved by hand without tools?
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02-24-2014, 10:37 AM
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#8 (permalink) |
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A True Z Fanatic
Join Date: Aug 2012
Location: Edmonton Alberta Canada
Posts: 2,089
Drives: 40th 370z
Rep Power: 131 |
Is it related to engine speed then? if so then that rules out everything like wheel bearings and tires.
If you are not moving and you rev up the engine do you hear the same sound?
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02-24-2014, 10:42 AM
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#9 (permalink) |
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Base Member
Join Date: Sep 2013
Location: detroit
Posts: 42
Drives: '09 370Z
Rep Power: 11 |
no its only when im moving and at higher speeds >50 mph. the noise drowns out all other noises and just whines. It started this winter so I didnt know if the car just doesnt like cold weather or what but it sounds bad.
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02-24-2014, 10:48 AM
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#11 (permalink) |
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Premium Member
Join Date: Nov 2010
Location: South Arkansas
Posts: 8,435
Drives: 2014 Challenger
Rep Power: 324197 |
Could be a lot of things, including trans or diff. You need to pinpoint the location of the noise.
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Steering Lock Links - Search The370Z Bookmarklet - FSM @ NICOclub Mankind has progressed past the need for war but we haven't evolved that far. - NachoMahma |
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02-24-2014, 10:50 AM
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#12 (permalink) | |
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A True Z Fanatic
Join Date: Aug 2009
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Quote:
probably not engine related... might be tranny related, but not sure if op tried going up to 7k rpm in 1st. that'll net you sub-50mph noise. no noise, then probably wheel bearings or something. |
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02-24-2014, 11:07 AM
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#15 (permalink) |
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A True Z Fanatic
Join Date: Aug 2012
Location: Edmonton Alberta Canada
Posts: 2,089
Drives: 40th 370z
Rep Power: 131 |
Does your car have a 3M bra on the front of it?
What about if you pop the car into neutral while moving and let the engine rpms go to idle, is the noise still there?
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2007 Chevy Duramax - EFILive Tuned By Me 2010 40th W/ Nav - Boosted Performance - UpRev Tuned By Me The Mrs. Ride -2012 335XI N55 BMW - Cobb Tuned By Me, Built by her My Build --> http://www.the370z.com/members-370z-...39s-build.html |
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.. or a/c inlet vent area.. 
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