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Help! "Thumping" noise
Thread Starter
Racer
Joined: May 2012
Posts: 363
Likes: 0
From: Peabody MA
Help! "Thumping" noise
I autocrossed my bone stock 92 yesterday and it was a blast, but I drove the car pretty damn hard. I noticed afterwards that there seems to be a slight bump that seems to occur with every rotation of the wheels.
At slow speeds, under 30, it's pretty noticeable. At normal speeds it's hardly noticeable, but above 85 the car seems to vibrate more than usual.
I think I could have messed up something with my brakes, or maybe a wheel bearing, but I'm obviously not sure. It's not a major problem, it's just a little annoying considering it is my only car/daily driver. Does anyone know what this could be?
Car: stock 1992 coupe, 6-speed, suspension components are all original and I believe the brake rotors are as well. Help please, thanks!
At slow speeds, under 30, it's pretty noticeable. At normal speeds it's hardly noticeable, but above 85 the car seems to vibrate more than usual.
I think I could have messed up something with my brakes, or maybe a wheel bearing, but I'm obviously not sure. It's not a major problem, it's just a little annoying considering it is my only car/daily driver. Does anyone know what this could be?
Car: stock 1992 coupe, 6-speed, suspension components are all original and I believe the brake rotors are as well. Help please, thanks!
Thread Starter
Racer
Joined: May 2012
Posts: 363
Likes: 0
From: Peabody MA
Now that you mention it, I did manage to lock up and slide once yesterday.... I'll go check my tires for that. Hopefully that's all it is.
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Le Mans Master
Joined: Aug 2007
Posts: 8,735
Likes: 412
From: WV
..... Tom , If you have to pay someone to do the job it's big $$$$..If you read his post above he doesn't even own a jack.......WW
Last edited by WW7; Apr 1, 2013 at 11:20 AM.
Thread Starter
Racer
Joined: May 2012
Posts: 363
Likes: 0
From: Peabody MA
I think I can get my hands on a jack, they're around. I'm going to jack it up today and look for flat spots on the tires. Is there any chance I could have a warped rotor? After a few hard runs with a novice driver slamming the brakes maybe that could happen?
How would I inspect the U-joints?
Thanks for the help guys, I need it!
How would I inspect the U-joints?
Thanks for the help guys, I need it!
Le Mans Master
Joined: Aug 2007
Posts: 8,735
Likes: 412
From: WV
Your right , it could be a rotor, C4s warp rotors pretty easily..... Once you get it off the ground you can check for a warped rotor by spining the wheel and listening for the sound of the rotor touching the brakes...This should be easy to tell.... With the ujoints you have to do the same thing , spin the wheel and listen to the ujoints to see if one is making a noise..You may have to get the axle straight to get it to make a noise...It may not do it while hanging down with pressure off the suspension.. You also may be able to feel the flat spot on the tire with your hand, if thats the problem....Good luck....WW
Last edited by WW7; Apr 1, 2013 at 12:30 PM.
1994 Admiral Blue ZZZZZR1
Joined: Sep 2007
Posts: 2,688
Likes: 127
From: Jarrettsville, md
Northeast Events Coordinator
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
I autocrossed my bone stock 92 yesterday and it was a blast, but I drove the car pretty damn hard. I noticed afterwards that there seems to be a slight bump that seems to occur with every rotation of the wheels.
At slow speeds, under 30, it's pretty noticeable. At normal speeds it's hardly noticeable, but above 85 the car seems to vibrate more than usual.
I think I could have messed up something with my brakes, or maybe a wheel bearing, but I'm obviously not sure. It's not a major problem, it's just a little annoying considering it is my only car/daily driver. Does anyone know what this could be?
Car: stock 1992 coupe, 6-speed, suspension components are all original and I believe the brake rotors are as well. Help please, thanks!
At slow speeds, under 30, it's pretty noticeable. At normal speeds it's hardly noticeable, but above 85 the car seems to vibrate more than usual.
I think I could have messed up something with my brakes, or maybe a wheel bearing, but I'm obviously not sure. It's not a major problem, it's just a little annoying considering it is my only car/daily driver. Does anyone know what this could be?
Car: stock 1992 coupe, 6-speed, suspension components are all original and I believe the brake rotors are as well. Help please, thanks!
Have you changed your tires? (Original?). How many miles on your cr?
I've heard of ltpws (tire sensors) coming lose and making a lot of noise
Have you done anything recently to your car?
David
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
Thread Starter
Racer
Joined: May 2012
Posts: 363
Likes: 0
From: Peabody MA
Your right , it could be a rotor, C4s warp rotors pretty easily..... Once you get it off the ground you can check for a warped rotor by spining the wheel and listening for the sound of the rotor touching the brakes...This should be easy to tell.... With the ujoints you have to do the same thing , spin the wheel and listen to the ujoints to see if one is making a noise..You may have to get the axle straight to get it to make a noise...It may not do it while hanging down with pressure off the suspension.. You also may be able to feel the flat spot on the tire with your hand, if thats the problem....Good luck....WW
Tires aren't very old. The fronts are almost new and the rears probably have 25k on them. Gotta switch them this week.
Haven't done a thing to it!
Any more advice or ideas is appreciated!
Le Mans Master
Joined: Aug 2007
Posts: 8,735
Likes: 412
From: WV
Thanks. Yeah I'm going to jack it up today and hopefully find out what's going on. Something tells me it's a warped rotor because when I brake, even softly, it feel like the brakes are varying in pressure even though my foot is staying put. It is definitely with each rotation of the tires.
117k miles. I've had ASR and ABS lights on for a few months now, maybe there has been a slight persisting problem and autocross made it a bigger problem. Hopefully I'll find out today.
Tires aren't very old. The fronts are almost new and the rears probably have 25k on them. Gotta switch them this week.
Haven't done a thing to it!
Any more advice or ideas is appreciated!
117k miles. I've had ASR and ABS lights on for a few months now, maybe there has been a slight persisting problem and autocross made it a bigger problem. Hopefully I'll find out today.
Tires aren't very old. The fronts are almost new and the rears probably have 25k on them. Gotta switch them this week.
Haven't done a thing to it!
Any more advice or ideas is appreciated!
.If your going to continue autocrossing you may want to look into slotted rotors, they dissipate the heat faster.. The guys that are into autocrossing regularly usually go to a larger brake system ( bigger slotted rotors , larger Hawk pads)...
...WW
Last edited by WW7; Apr 1, 2013 at 01:57 PM.
Drifting
Joined: May 2012
Posts: 1,336
Likes: 15
From: Mechanicsburg PA
Central PA Events Coordinator
St. Jude Donor '12-'13
117k miles. I've had ASR and ABS lights on for a few months now, maybe there has been a slight persisting problem and autocross made it a bigger problem. Hopefully I'll find out today.
Tires aren't very old. The fronts are almost new and the rears probably have 25k on them. Gotta switch them this week.
Haven't done a thing to it!
Any more advice or ideas is appreciated!
Tires aren't very old. The fronts are almost new and the rears probably have 25k on them. Gotta switch them this week.
Haven't done a thing to it!
Any more advice or ideas is appreciated!
ASR/ABS light? No fluid change? Didn't inspect the brakes in advance? Rear tires already with significant mileage...
First notion: If budget is non-existent, don't race your daily driver. Period.
Do you have an adrenaline junkie personality? Would not have placed the car on ANY road let alone an AutoX track until the car is deemed reliable and mechanically sound.
Sounds like the car was not prepped or race-ready. Let alone be road worthy.
Am not trying to be hard on you... its not that entertaining to me to be pushing around a Corvette to be in that mechanical sub-par condition.
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
OP, when you get the jack to do your inspection of the wheel bearing/u-joints, etc., maybe consider (if you haven't already) jackstands, throw a rim under it...whatever. Something.