Hi guys, I have searched and found somethings, but nothing similar to what my problem is. I have a 92 Civic Si Hatch. Stock rotors but I have a B series swap. I have had this engine for a little bit now but I just yesterday my car started vibrating under thottle. After 2k from 1st gear the car starts to vibrate just slightly. It does this under throttle through every gear and stops as soon as I let off the throttle or put my car in neutral. I now it's not the wheels, but someone suggested it might be the axles. Others have told me it might be the hubs or rack n pinion. I am trying to get down to the exact thing it might be and not have to change more than one thing if it is not necessary. If anyone has had this problem or have an Idea on what it might be. Any input is helpful.

 

Anyone? or does anyone know how to check when a half shaft goes out?

 

im thinking axles

 

that is absolutely all it does? vibrates under accel.? does it get worse as rpms climb in neutral? roll down a steep hill in neutral- does it get worse as speed increases?

i dont know what it is? axle, motor mount, tranny, motor, series of small potholes, a bunch of smurfs?

 

What kind of engine mounts are you using? rubber...urathane??? I know race mounts make everything vibrate under acceration or engine braking. Just a thought?

 

I am using Stock mounts and it was fine before, it just started doing this the day after I launched on it a few times for practice. It only does this under accel. I can take it pretty high and put it in neutral and it will stop vibrating. If I let off throttle but still in gear i can feel it a little. It does seem to get a little worse as rpms climb.

 

I recently got my car tuned and got launch control so I was practicing my launch with it. I did take air out of the tires cause my motor has good torque and tends to spin the tires forever. Does anyone know what are ways of telling if your intermediate shaft is bad?

 

It could also be tires.

If your tires are worn unevenly or bad, your car make shake under acceleration

 

I dont think it will be my tires because even if im doing 60 or 70 only when Im on the throttle I can feel the vibration. As soon as I go in neutral it stops.

 

I know.. its weird... but I'm not talking out my ***

same thing was happening to me...

only under throttle would I experience this,

Turns out it was the tires.

don't be lazy, take your *** out side and see if your front tires look funny.

 

my mothers car had the same problem and it also turned out to be bad tires...so i guess if you rotate your tires you can maybe see if its the front tires good luck

 

ITS NOT THE TIRES, NOTHING ABOUT THE TIRE CHANGES SUDDENLY WHEN YOU HIT THE GAS.

you have a bad rear engine mount or bad inner tripod/cv joint going bad. check for slop in your axles inner cv's, and check motor mounts.

 

Well the rear motor mount was filled in with urethane so it's pretty much solid. The other motor mounts seem to be good. If by inner tripod/cv joint going bad you mean, axles I think that's what it's gonna be. Since my axles were not new I think that's gonna be the problem. But is there any way to check it without taking them out.

 

Not really...
but its free to check your tires.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by schardbody &raquo;</TD></TR><TR><TD CLASS="quote">ITS NOT THE TIRES, NOTHING ABOUT THE TIRE CHANGES SUDDENLY WHEN YOU HIT THE GAS.
</TD></TR></TABLE>

except that you are applying a load / torque to them.

Tell me that a tire is not dynamic, and I will show you a picture of a tire that flexes under throttle


Tires are often the cause of shaking or vibration. Especially on lowered cars that have not been properly aligned.

Notice that I am not ruling out any of your suggestions. I am offering the expericence that I have seen and fixed on several cars.
It may be something else other than tires. But its the first thing I look at.

You don't have turn a wrench or spend any money on this. All you have to do, is drag your *** outside, turn the whell and look at the tire.

If the tires are worn (especially if they are unevenly worn) you can swap the rears to fronts if the rears are good tires. Most people on this board can rotate their tires. But not everyone can remove engine mounts and axles, let alone diagnose if they are a good or not.

 

if someone cant diagnose a bad axle then they have no business working on a car.

 

i will bank on the axles. i had the same exact problem with my h22 accord. i thought it was the mounts and the tires. checked all the mounts and they were ok. changed the tires and it kept up. i just pulled the axles out last fall and it turned out that the inner cv joint on the passenger side was loose like my friends sister. the axle actually had lateral play. the joints was smashed to pieces lol. however it never made any noise. anyway, check your axles.

btw: i may not have too many posts but ive been on here for quite a while and im not a noob, i do know what im talking about.........
cheers and good luck

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by gofastmobile &raquo;</TD></TR><TR><TD CLASS="quote">i will bank on the axles. i had the same exact problem with my h22 accord. i thought it was the mounts and the tires. checked all the mounts and they were ok. changed the tires and it kept up. i just pulled the axles out last fall and it turned out that the inner cv joint on the passenger side was loose like my friends sister. the axle actually had lateral play. the joints was smashed to pieces lol. however it never made any noise. anyway, check your axles.

btw: i may not have too many posts but ive been on here for quite a while and im not a noob, i do know what im talking about.........
cheers and good luck</TD></TR></TABLE>

exactly right, inner cv play is the most common source of this problem. i have yet to see a tire cause a vibration on acceleration only, soley because its NOT POSSIBLE, the dynamics of the tire do not change during acceleration, the load changes, but in a way that its decreased, which would if anything make a tire vibration less noticeable while accelling.

 

like i said my mothers car was tire problems. changed the tire problem went away!!! i dont claim to know everything but i do know that this happend and can happen. might not be the problem but its worth checking.

 

Thanx for all the help guys. Today I checked the tires but they seem to be fine. No lumps Nothing noticeable. But I did grab a hold of the half shaft or driver side axle and tried to move it back and forth and it did have some play. I checked my friends and his was pretty solid. I have heard of axles binding but don't really know whats the cause of that. what do you guys think?

 

in and out play isnt really bad, you need to check it for up and down play. most cases its the passenger side for some reason, but check em both, only takes a second.

 

It's not in and out it's Up and down. Going from the floor up. Im planning on changing the axle three days from now cause this is my daily driver. Do you think anything might mess up if I wait that long?

 

nah, just dont be launching the crap out of it and you should be ok. also once the axle is off the intermediate shaft i would check the intermediate shaft bearing, if its bad it will cause the axle to do the same thing again.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by schardbody &raquo;</TD></TR><TR><TD CLASS="quote">nah, just dont be launching the crap out of it and you should be ok. also once the axle is off the intermediate shaft i would check the intermediate shaft bearing, if its bad it will cause the axle to do the same thing again. </TD></TR></TABLE>

x2

 

how can you tell if the intermediate shaft bearing is bad? seized up or something?