vibrating car?
So today, it seems like my car has started vibrating.. at first it would do it only when coasting in nuetral. But the it started through all the gears. it isn't too bad but definitely different from the other recent problems I've been having
It kinda feels like the car is running rough, but it hasa good idle and zips up to redline fast. I thouht I should add, earlier today I did some donuts.. and a little while before the vibrating thing I raced a mustang.. I have an NA s5. |
My vote goes for rear U-Joint.
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My first thought.. buuut upon searching I foun that it usually happened when they were at a certain speed..
I JUST REMEMBERED! I recently thought my diff mount was broken(but found that it wasn't) because when engaging reverse or going slow in 1st the car would jolt and shake back and fourth quite violently. Maybe this caused the u-joint to go bad? Or maybe its the same thing? |
Jack the car up and start checking. Vibrations could be a number of things from tires, brakes, steering to drivetrain.
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It feels like its from the tranny or the wheels.. I noticed that it vibrates a lot around 25-30mph and when in nuetral and doesn't vibrate when at a stop. Which rules out the driveshaft.. maybe somethings messed up in the tranny? But why would it only vibrate when moving? That means it has to be the alignment right? But why would it start vibrating out of nowhere?
I'm not sure but I really need some help. |
Originally Posted by beachFC
(Post 11094575)
Which rules out the driveshaft.. maybe somethings messed up in the tranny? ?
I'm not sure but I really need some help. Your post was actually 100% wrong! If it doesnt vibrate at a stop (driveshaft NOT moving)... it would be the driveshaft - or at least something that moves when the car moves. GO CHECK THE DRIVESHAFT. |
Originally Posted by MIDNFauciUSN
(Post 11094598)
JEEZUS. Take the 30 minutes and go check the driveshaft/u-joint.
Your post was actually 100% wrong! If it doesnt vibrate at a stop (driveshaft NOT moving)... it would be the driveshaft - or at least something that moves when the car moves. GO CHECK THE DRIVESHAFT. I'm sure you aware what nuetral is. The driveshaft would hardly be moving at all |
Originally Posted by beachFC
(Post 11094604)
JEEZUS. I did. And didn't find anything suspect. The driveshaft wouldn't have any stress on it if I was in nuetral which is when it vibrates most. My post is not 100% wrong.
I'm sure you aware what nuetral is. The driveshaft would hardly be moving at all So yes, it is. |
And I personally have never had a vibration out of misaligned wheels - but I'm not saying that it isn't possible. As long as they're balanced, shouldn't be an issue. Maybe you threw a weight off of your wheels when you were tearing up your car doing donuts. I doubt that too... but who knows how long they've been on there (I obviously dont).
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Originally Posted by MIDNFauciUSN
(Post 11094607)
Last I checked, when you're in neutral, driveshaft speed is a function of rear wheel speed... not transmission speed.
So yes, it is. |
Originally Posted by beachFC
(Post 11094630)
That is exactly what I mean.. at 20mph the driveshaft wouldn't really be moving much.. and the speed definitely wouldn't match with the speed and intensity at which it was vibrating
It doesn't sound like you've pulled the u-joint off of the diff flange yet... have you? |
Originally Posted by MIDNFauciUSN
(Post 11094632)
At 20 mph, the driveshaft would definitely be spinning fast enough to make a fucked up u-joint vibrate.
It doesn't sound like you've pulled the u-joint off of the diff flange yet... have you? |
just spend the 30 minutes and eliminate it. Then move to the other stuff.
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Originally Posted by MIDNFauciUSN
(Post 11094643)
just spend the 30 minutes and eliminate it. Then move to the other stuff.
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I gave you a list of things to check. Does it vibrate at all while in neutral and at a stop (0 mph)?
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Originally Posted by JerryLH3
(Post 11094973)
I gave you a list of things to check. Does it vibrate at all while in neutral and at a stop (0 mph)?
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I had u joint trouble, but I had to take it off to see what the trouble was, no good just looking at it, or even just twisting the staff. The mechanic said not the driveshaft, but vibration continued, so I took the driveshaft off at home and both end u joints were shot.
New bearings are really hard to find, a wierd size, I wound up getting a used vert driveshaft with good bearings, if and when that goes I will have to take my old driveshaft and have the yokes bored out to fit a regular size bearing cup at a local shop. Donuts and racing Mustangs? You remind me of a young guy who bought a Porsche 944 and blew the diff completely doing donuts. And whined all over the Rennist board You have a 23 year old car treat it nicely, go get a Civic if you want to drive like an idiot! |
If it only vibrates when moving, regardless of speed, it's somewhere AFTER the transmission....the driveshaft, rear end, brakes, wheels, tires, etc.
Go replace your u-joint(s), then come back. |
Originally Posted by mbonner
(Post 11095275)
I had u joint trouble, but I had to take it off to see what the trouble was, no good just looking at it, or even just twisting the staff. The mechanic said not the driveshaft, but vibration continued, so I took the driveshaft off at home and both end u joints were shot.
New bearings are really hard to find, a wierd size, I wound up getting a used vert driveshaft with good bearings, if and when that goes I will have to take my old driveshaft and have the yokes bored out to fit a regular size bearing cup at a local shop. Donuts and racing Mustangs? You remind me of a young guy who bought a Porsche 944 and blew the diff completely doing donuts. And whined all over the Rennist board You have a 23 year old car treat it nicely, go get a Civic if you want to drive like an idiot! i'm aware that the car is 20+ years old. but the motor and diff are not. and from what i remember the rx7 was a sports car? am i wrong? :scratch: oh and i know i'm not mistaken about the 13b being able to handle quite a bit of abuse as well. i didn't know i was supposed to baby my Rx fucking 7, if i wanted a bitch car i wouldv'e bought a geo metro.. thanks :icon_tdow and ps. i personally hate civics. and donuts are quite fulfilling :lol: |
I give up. I suppose really you need an adult with electical and mechanical skills to drive over and fix your car and you are unwilling to take advice from knowledgeable posters here on tho board?
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Originally Posted by mbonner
(Post 11095309)
I give up. I suppose really you need an adult with electical and mechanical skills to drive over and fix your car and you are unwilling to take advice from knowledgeable posters here on tho board?
i can fix what ever the problem is on my own as far as mechanical shit goes. as for electrical, i am fuckin clueless |
Dude, four people say your u-joints.
Check/replace your fucking u-joints then come back if it persists! |
Originally Posted by Jet-Lee
(Post 11095442)
Dude, four people say your u-joints.
Check/replace your fucking u-joints then come back if it persists! This is going in circles. Dude, we've tried to help you - in about 15 replies. You've yet to check the u-joint and report back. I give up. |
Oh my lord. I have checked the damn u joint. That was one of the first things I checked. I said that earlier.
When I said "driveshaft" I checked the ujoints. I didn't completely disassemble them because fuck that. And they seem to be fine. I asked what ELSE could it be. Since it seems to be none of the regular "ujoint blah blah blah" shit |
You're not listening, or reading.
Originally Posted by mbonner
(Post 11095275)
I had u joint trouble, but I had to take it off to see what the trouble was, no good just looking at it, or even just twisting the staff.
There's not much else it could be, short of out-of-balance wheels, and the car still be driveable. If it was your transmission, it wouldn't be driveable. If it was your rear end, it wouldn't be driveable. If it was your brakes, it wouldn't be stoppable. Change your u-joints, then come back. It's not a difficult thing to do. The u-joint is a weak link in any RWD vehicle. If there's any sort of vibration, it's always the first thing suspect. It's cheap to replace, and preventative maintenance if nothing else. Just do it. |
" I didn't completely diassemble them because fuck that. And they seem to be fine" Well, guys, I guess he is just not "helpable" I suggest we just let him get on with it, I'm outta here.
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Originally Posted by mbonner
(Post 11096289)
" I didn't completely diassemble them because fuck that. And they seem to be fine" Well, guys, I guess he is just not "helpable" I suggest we just let him get on with it, I'm outta here.
decided i'm just going to replace everything.. the whole "preventative maintenance" thing got me thinking.. might as fuckin well thanks guys |
Seriously?! All this fucking argument and resistance from you, for you to just up and decide to replace it all??
I smell bullshit. |
Originally Posted by Jet-Lee
(Post 11097105)
Seriously?! All this fucking argument and resistance from you, for you to just up and decide to replace it all??
I smell bullshit. |
Is it still vibrating?
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Originally Posted by Jet-Lee
(Post 11097408)
Is it still vibrating?
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Then no.
Replaced the u-joints yet? |
Originally Posted by Jet-Lee
(Post 11097415)
Then no.
Replaced the u-joints yet? |
Let's cut through all the BS.
Originally Posted by beachFC
(Post 11094575)
It feels like its from the tranny or the wheels.. I noticed that it vibrates a lot around 25-30mph and when in nuetral and doesn't vibrate when at a stop. Which rules out the driveshaft.. maybe somethings messed up in the tranny? But why would it only vibrate when moving? That means it has to be the alignment right? But why would it start vibrating out of nowhere?
I'm not sure but I really need some help. With the car stationary and in neutral, it doesn't vibrate. You have a bad u-joint. Pull the driveshaft and inspect the joints. Any amount of slop, stiffness or "crunchyness" indicates a bad joint. Very common issue as these cars age since the u-joints are non-servicable from the factory. At this point you can buy a new OEM shaft, replace the joints yourself (pain in the ass), have a local driveline shop do it, or buy a new aftermarket shaft from the local driveline shop or Mazdatrix. There, done. |
Originally Posted by Aaron Cake
(Post 11097758)
Let's cut through all the BS.
So you're saying that it vibrates when the car is moving a lot between 25 and 30 MPH. With the car stationary and in neutral, it doesn't vibrate. You have a bad u-joint. Pull the driveshaft and inspect the joints. Any amount of slop, stiffness or "crunchyness" indicates a bad joint. Very common issue as these cars age since the u-joints are non-servicable from the factory. At this point you can buy a new OEM shaft, replace the joints yourself (pain in the ass), have a local driveline shop do it, or buy a new aftermarket shaft from the local driveline shop or Mazdatrix. There, done. |
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