Noise from the back of the car - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

fiberwire · 06-19-2017, 11:44 AM

Hi,

While driving on the freeway when I let the gas off I can hear a horrible loud and vibrating noise coming from the back of the car. As soon as I hit clutch it goes away. I release the clutch and the noise comes back. I step on the gas and the noise goes away.

Any ideas what could be wrong? The noise started after getting back my car from bush replacement...

ZaK687 · 06-19-2017, 12:37 PM

what kind of differential do you have? checked axles for wear? everything torqued down properly?

fiberwire · 06-19-2017, 12:45 PM

Its the stock one. (Sorry forgot to mention, its an S13 sr20det). Well it was at the mechanic, I can only assume (and hope) that he torqued down everything properly..

Any ideas how to start ruling things out? Does the fact that there is no noise while driving at low speed mean anything?

ZaK687 · 06-19-2017, 01:09 PM

hmm, is your rear gutted at all on the inside? could be that your car is just resonating now that the subframe is solid. the fact that the sound is at high speed supports the idea that its resonating, check your driveshaft and diff mounts. Thats what I looked at first when I got vibrations from the rear.

Standard · 06-20-2017, 11:04 PM

Check your u-joints and carrier bearing for excessive play

koukizhang · 07-14-2017, 11:18 AM

If you have solid subframe bushings or differential bushings, it'll make that sound.

Jefro240 · 07-14-2017, 12:11 PM

Solid subframe bushings allow for the resonating frequency of the differential to be heard. But it is just noise. You should not have any vibration unless you have a drive shaft or axle shaft seizing up. ie, something out of balance. Unless a bearing in the diff is shot @ which point be careful because you do not want it blowing a part while driving.

fiberwire · 07-14-2017, 12:41 PM

Quote:

Originally Posted by Jefro240

Solid subframe bushings allow for the resonating frequency of the differential to be heard. But it is just noise. You should not have any vibration unless you have a drive shaft or axle shaft seizing up. ie, something out of balance. Unless a bearing in the diff is shot @ which point be careful because you do not want it blowing a part while driving.

Exactly. If it was only noise I wouldnt mind. Its waaaay too much vibration. Above 100km I feel like the rear left wheel is going to come off. (at least that's where I believe it is coming from)

What the fuck could that f****cking mechanic have done wrong again

Jefro240 · 07-14-2017, 02:15 PM

Quote:

Originally Posted by fiberwire

Exactly. If it was only noise I wouldnt mind. Its waaaay too much vibration. Above 100km I feel like the rear left wheel is going to come off. (at least that's where I believe it is coming from)

What the fuck could that f****cking mechanic have done wrong again

Any impact marks on the rim or tire? Perhaps they took it for a joy ride. Slide into a curb & damaged the wheel bearing.

If you are sure its the left rear. Inspect the Wheel Bearing & Axle Shaft. Jack it up & turn it by hand etc & see if she grinds or makes any noise. Could have lost a wheel weight from the rim & now its out of balance.

06-19-2017, 11:44 AM	#1
fiberwire Join Date: Mar 2017 Location: EU Posts: 9 Trader Rating: (0) Feedback Score: 0 reviews	Noise from the back of the car Hi, While driving on the freeway when I let the gas off I can hear a horrible loud and vibrating noise coming from the back of the car. As soon as I hit clutch it goes away. I release the clutch and the noise comes back. I step on the gas and the noise goes away. Any ideas what could be wrong? The noise started after getting back my car from bush replacement...

07-14-2017, 12:11 PM	#7
Jefro240 Leaky Injector Join Date: Jun 2005 Location: Eastern Hemisphere Posts: 123 Trader Rating: (0) Feedback Score: 0 reviews	Solid subframe bushings allow for the resonating frequency of the differential to be heard. But it is just noise. You should not have any vibration unless you have a drive shaft or axle shaft seizing up. ie, something out of balance. Unless a bearing in the diff is shot @ which point be careful because you do not want it blowing a part while driving. __________________ \| 92 S13 Hatch \| 92 S13 Coupe \| 95 S14.5 \|

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06-19-2017, 12:37 PM	#2
ZaK687 Zilvia Addict Join Date: Apr 2013 Location: LIVERMORE, CA Posts: 838 Trader Rating: (16) Feedback Score: 16 reviews	what kind of differential do you have? checked axles for wear? everything torqued down properly?

06-19-2017, 12:45 PM	#3
fiberwire Join Date: Mar 2017 Location: EU Posts: 9 Trader Rating: (0) Feedback Score: 0 reviews	Its the stock one. (Sorry forgot to mention, its an S13 sr20det). Well it was at the mechanic, I can only assume (and hope) that he torqued down everything properly.. Any ideas how to start ruling things out? Does the fact that there is no noise while driving at low speed mean anything?

06-19-2017, 01:09 PM	#4
ZaK687 Zilvia Addict Join Date: Apr 2013 Location: LIVERMORE, CA Posts: 838 Trader Rating: (16) Feedback Score: 16 reviews	hmm, is your rear gutted at all on the inside? could be that your car is just resonating now that the subframe is solid. the fact that the sound is at high speed supports the idea that its resonating, check your driveshaft and diff mounts. Thats what I looked at first when I got vibrations from the rear.

06-20-2017, 11:04 PM	#5
Standard Zilvia Addict Join Date: Apr 2014 Location: Milwaukee Age: 31 Posts: 810 Trader Rating: (11) Feedback Score: 11 reviews	Check your u-joints and carrier bearing for excessive play

07-14-2017, 11:18 AM	#6
koukizhang Zilvia Member Join Date: Jun 2014 Location: AZ Posts: 296 Trader Rating: (0) Feedback Score: 0 reviews	If you have solid subframe bushings or differential bushings, it'll make that sound.