Need Help Diagnosing This Sound - ZR-1 Net Registry Forums

jcruz · 02-03-2018

Looking for help diagnosing the sound heard in the video.

The video is of me moving the car back and forth in my garage next to the rear wheel on the driver side. 1992.

At this point the car is sidelined and I don't feel it's safe to drive.

Any help would be appreciated!

John

https://vimeo.com/254120397

S.hafsmo · 02-03-2018

On mine the mount for the brake hose had gotten bent slightly, causing the hose to touch the wheel. At least it's easy to check.

TX '90 ZR1 · 02-03-2018

I'm not an expert at this, but my first thought was a u-joint binding.
I'd get the rear up in the air, remove the tires and see if you can duplicate the sound turning the assembly by hand.
Could be numerous things, but I think with the tires off you should be able to track it down.
Let us know what you find out.

jcruz · 02-03-2018

I'll do the two checks above.

Strangely enough, when I put a different set of rims/tires on, the sound & feeling isn't as pronounced. Still there, just not as bad.

Thanks!

lfalzarano · 02-03-2018

Put it on a lift in neutral and manually rotate the tire. Mark the tire at 12 o’clock when you hear the noise. It might be in more than one spot on the rotation. Once the marked spots can duplicate the noise, use a stethoscope to pinpoint the source of the noise from the rim to the differential. Good luck. [emoji481]

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Ronstar · 02-03-2018

My money is on u joint

jcruz · 02-03-2018

Quote:

Originally Posted by Ronstar

My money is on u joint

Noted. U joint is primary suspect #1. Will do more testing tomorrow!

Ccmano · 02-03-2018

Quote:

Originally Posted by Ronstar

My money is on u joint

I tend to agree, also check the parking brake assembly.
H

Young1 · 02-04-2018

U joint or wheel bearing. Crunchy Munchy

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jcruz · 02-04-2018

So, I got the car up on stands this morning, ready to manually turn the wheel and see what was going on. The first thing I notice is that the driver rear wheel is loose! OMG, like really loose

I could rock it back and forth and 4 lugs came off by hand.

Took the wheel off and turned by hand...no noise. So, I guess the sound was due to the loose wheel?

I'm feeling very lucky! I guess when I swapped the wheels last time I must have missed tightening these lugs down (I was in a bit of a hurry). Oh man.

Thanks all for the feeback

John

02-03-2018	#2
S.hafsmo Join Date: Nov 2016 Location: Norway Posts: 397	Re: Need Help Diagnosing This Sound On mine the mount for the brake hose had gotten bent slightly, causing the hose to touch the wheel. At least it's easy to check. __________________ - '90 ZR-1

02-03-2018	#3
TX '90 ZR1 Join Date: Oct 2017 Location: TX Posts: 2,038	Re: Need Help Diagnosing This Sound I'm not an expert at this, but my first thought was a u-joint binding. I'd get the rear up in the air, remove the tires and see if you can duplicate the sound turning the assembly by hand. Could be numerous things, but I think with the tires off you should be able to track it down. Let us know what you find out.

02-03-2018	#4
jcruz Join Date: Mar 2010 Location: Fort Myers, FL Posts: 343	Re: Need Help Diagnosing This Sound I'll do the two checks above. Strangely enough, when I put a different set of rims/tires on, the sound & feeling isn't as pronounced. Still there, just not as bad. Thanks! __________________ 1992 #043, Aqua/Gray 40k miles

02-03-2018	#5
lfalzarano Join Date: Feb 2011 Location: Clayton, North Carolina Posts: 1,133	Re: Need Help Diagnosing This Sound Put it on a lift in neutral and manually rotate the tire. Mark the tire at 12 o’clock when you hear the noise. It might be in more than one spot on the rotation. Once the marked spots can duplicate the noise, use a stethoscope to pinpoint the source of the noise from the rim to the differential. Good luck. [emoji481] Sent from my iPhone using ZR-1 Net Registry __________________ Lou[COLOR="Red"][B][SIZE="4"][/SIZE][/B][/COLOR]

02-03-2018	#6
Ronstar Join Date: Jul 2012 Location: Michigan Posts: 182	Re: Need Help Diagnosing This Sound My money is on u joint __________________ Ron Thompson 1990 421ci ZR-1 2010 ZR1 (stock)

02-03-2018	#1
jcruz Join Date: Mar 2010 Location: Fort Myers, FL Posts: 343	Need Help Diagnosing This Sound Looking for help diagnosing the sound heard in the video. The video is of me moving the car back and forth in my garage next to the rear wheel on the driver side. 1992. At this point the car is sidelined and I don't feel it's safe to drive. Any help would be appreciated! John https://vimeo.com/254120397 __________________ 1992 #043, Aqua/Gray 40k miles

02-04-2018	#9
Young1 Join Date: Sep 2016 Location: Ocala, FL Posts: 900	Re: Need Help Diagnosing This Sound U joint or wheel bearing. Crunchy Munchy Sent from my iPhone using ZR-1 Net Registry __________________ Steve Young 1991 ZR-1 Quasar Blue Metallic/Black #729 Second Owner 1991 ZR-1 Dark Red Metallic/Black #2040 SOLD 1990 ZR-1 Dark Red Metallic/Saddle #1670 SOLD Double your happiness.....complain half as much.