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JR3800
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PostSubject: new noises ?   Wed Jul 02, 2014 1:27 am

hey everyone, two new noises has started with the rivi. first is a clunk that is only prominent after i come to a complete stop and just after I start to accelerate fairly lightly it makes a clunking noise, i thought it could possibly be a motor mount because they seem worn but its just after i start accelerating , and if i accelerate quicker form a stop it happens sooner but its always after the initial take off, has me quite confused.

the next noise is when im reversing and turning the wheel either way with my foot lightly on the brakes its like an intermittent rubbing/vibration noise but i can feel it through the brake pedal and steering wheel it becomes less prominent if i take my foot of the brakes while im reversing .

no idea where to start looking frown


Last edited by JR3800 on Wed Jul 02, 2014 1:28 am; edited 1 time in total (Reason for editing : terrible grammar lol)
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rivi95era
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PostSubject: Re: new noises ?   Wed Jul 02, 2014 8:14 am

Check the motor and trans mounts first. I have seen both of those symptoms caused by the mounts. Especially transmission mounts. Not sure if the 98 has one in the bottom of the trans like some other GM cars of that era.
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JR3800
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PostSubject: Re: new noises ?   Wed Jul 02, 2014 12:35 pm

will do , il check them out at work! thank god for having a pit so i can get underneath the car .
will report back later on when im off the clock
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AA
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PostSubject: Re: new noises ?   Wed Jul 02, 2014 3:45 pm

One problem per thread, please. This thread will focus on the "clunk" on acceleration. Please do a search or post another thread regarding your braking noise. Thx.

You can check the mounts by inserting a large pry bar to apply leverage near the mount and watch for slop.

_________________
'98 SC Riviera 268k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
EBC bluestuff/Hawk HP plus SS lines Brembo slotted discs DHP tuned Aeroforce Hidden Hitch


'05 GTO 49k miles 0-60: 4.8s 16.9 avg MPG Nelson Ledges Lap: 1:26
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rivi95era
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PostSubject: Re: new noises ?   Wed Jul 02, 2014 4:03 pm

AA wrote:
One problem per thread, please. This thread will focus on the "clunk" on acceleration. Please do a search or post another thread regarding your braking noise. Thx.

You can check the mounts by inserting a large pry bar to apply leverage near the mount and watch for slop.

no disrespect but I think that both noises are from the same issue, regardless if they are the mounts or not. Good advise with the pry bar. I like to have a helper in the car and rev it in both reverse and drive. Sometimes they won't rear their ugly head with out some twisting torque on it.
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AA
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PostSubject: Re: new noises ?   Wed Jul 02, 2014 4:19 pm

Okay, thanks for clarification. It read to me like two separate issues.

If this is the case, your issue could be the front brake pads and/or rotors. Usually if it can be felt through both the steering wheel and the brake pedal, while brake is applied, it is brake-related.

(I don't believe it's related to your clunk, but could be. Check that your caliper bracket bolts are tight.)

_________________
'98 SC Riviera 268k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
EBC bluestuff/Hawk HP plus SS lines Brembo slotted discs DHP tuned Aeroforce Hidden Hitch


'05 GTO 49k miles 0-60: 4.8s 16.9 avg MPG Nelson Ledges Lap: 1:26
Because fun
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JR3800
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PostSubject: Re: new noises ?   Thu Jul 03, 2014 11:24 am

will check the caliper bolts! / and to report on the mounts the front mount that i was going to replace with hockey pucks eventually, seems to be the worse. With just a pry bar i can get quite a lot of movement from it the other ones seem pretty stiff.
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Abaddon
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PostSubject: Re: new noises ?   Thu Jul 03, 2014 12:00 pm

The factory mounts move a lot with a pry bar, especially the front one. It's a "hollow" mount. It only has rubber connecting in two places, and the rest is empty space. It's designed that way for comfort. Now, if the rubber is separated or split, it will move more and cause a clunk. I would have somebody brake torque the engine while you watch under the hood. Chances are, you'll find exactly which mount is bad that way......
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rivi95era
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PostSubject: Re: new noises ?   Thu Jul 03, 2014 12:53 pm

Abaddon wrote:
The factory mounts move a lot with a pry bar, especially the front one. It's a "hollow" mount. It only has rubber connecting in two places, and the rest is empty space. It's designed that way for comfort. Now, if the rubber is separated or split, it will move more and cause a clunk. I would have somebody brake torque the engine while you watch under the hood. Chances are, you'll find exactly which mount is bad that way......
precisely! lecture
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JR3800
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PostSubject: Re: new noises ?   Thu Jul 03, 2014 1:51 pm

Will do! I work tomorrow il have my coworker brake torque it while im in the pit, would have done it today but I took the day off work since its my birthday smile 21! I'm legal in the states now if i ever visit.
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rivi95era
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PostSubject: Re: new noises ?   Thu Jul 03, 2014 2:11 pm

beer
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JR3800
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PostSubject: Re: new noises ?   Sun Jul 06, 2014 10:45 am

it seems to be the rear motor mount that's making the clunk will replace asap!
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rivi95era
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PostSubject: Re: new noises ?   Sun Jul 06, 2014 10:53 am

Good job on locating it. Motor and trans mounts cause all sorts of funny noises and vibrations while driving especially at highway speeds in OD.
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