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Rear end bouncing/goes by itself

 
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Old 12-14-2011, 08:22 AM
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Rear end bouncing/goes by itself

Hello,
I'm new here, and I would like to ask you guys for your opinion…

I have BB1 prelude (94), 2,2 with 4WS. On car are 17” wheels and brand new tires. I bought car with stock shocks and Eibach spring (Pro-Kit which lowers car for 30 mm or 1,2 inch). Car has approximately 125.000 miles, with first shocks (I guess?). Eibach springs are on for last 30.000 miles.

Where is the problem? I have feeling, that car goes by itself – particularly rear end. Especially when fast accelerating or at high speeds. Car is also very nervous when the road has some bumps, minor holes,…

As far as I know, 4WS is working fine. When I give contact 4WS light goes on, and when I start car light for 4WS goes off immediately. And stays off. So 4WS shouldn’t be an issue?

I found some posts, where you were talking about pro et. contra for lowering the car just with springs. But before I go and spent some serious money on coil overs or some aftermarket shocks (such as tokico blue, which are popular on this forum) I would like to hear your opinion.

Thank you!
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Old 12-14-2011, 09:47 AM
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Re: Rear end bouncing/goes by itself

sounds like your shocks are blown
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Old 12-14-2011, 10:01 AM
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Re: Rear end bouncing/goes by itself

If its bouncing like a Cadillac.... your shocks are blown.
Which is exactly what happens with lowering springs on stock shocks- your on borrowed time.
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Old 12-14-2011, 12:57 PM
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Re: Rear end bouncing/goes by itself

Sounds more like the previous owner installed hydraulics but only had the funds for the rear...hit them switches!!

...Stock shocks are blown, invest in some KYB AGXs or Koni Yellows if you want to not have to replace shocks every few months
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Old 12-15-2011, 02:54 AM
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Re: Rear end bouncing/goes by itself

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Originally Posted by eludeauthority View Post
...Stock shocks are blown, invest in some KYB AGXs or Koni Yellows if you want to not have to replace shocks every few months
“funny” thing is, that previous owner had AGXs, but he was even more complaining about bouncing?

After a lot of investigation, he came up, that one of wheels needed repair, but as far as I know, he didn’t try again to put agx back on. I still have those AGX at home (they came in “spare parts bag” with car), but I really don’t want to switch things before I’m “sure” that this will solve problem. But it looks like that will be the only way

As far as I know, he also replaced all bushings, but I’m not 100% sure about that…
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Old 12-15-2011, 03:00 AM
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Re: Rear end bouncing/goes by itself

stock shocks on lowering springs are bad news, so even if you put the agx's on and it doesnt fix it you're still gonna be better off.
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Old 12-15-2011, 03:06 AM
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Re: Rear end bouncing/goes by itself

I wonder if the rear wheel balance is heavily off causing the bouncing effect, especially after stating a wheel needs repair (heavily bent/cracked?). That paired with blown shocks will definitely cause your stated issue.

Maybe have your wheel balance checked on all 4 wheels and go from there.
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Old 12-15-2011, 03:59 AM
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Re: Rear end bouncing/goes by itself

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Originally Posted by eludeauthority View Post
I wonder if the rear wheel balance is heavily off causing the bouncing effect, especially after stating a wheel needs repair (heavily bent/cracked?). That paired with blown shocks will definitely cause your stated issue.

Maybe have your wheel balance checked on all 4 wheels and go from there.
Wheel which was bent was fixed. And 1 month ago all 4 wheels were balanced when I was changing summer tires to winter tires. But during balancing came out, that another wheel is slightly bent, but it was solved with weights and put on rear end. There is slight shake on steering wheel at 120 km/h, but nothing dramatic.
I guess the right to do list would be:
- Repair that one wheel which is slightly bent
- Change stock shocks to agx (I hope that they are all right!)
- Do alignment check
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Old 12-15-2011, 04:00 AM
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Re: Rear end bouncing/goes by itself

I forgot to mention - thank you all for your comments!
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Old 12-15-2011, 01:19 PM
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Re: Rear end bouncing/goes by itself

A very out of balance wheel can cause the damper to go bad. The force of the wheel spinning out of balance is being damped by the shock. This happening over and over will cause the oil to overheat and cause air bubbles near the piston. Which in turn does havoc to the piston.
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Old 12-15-2011, 02:57 PM
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Re: Rear end bouncing/goes by itself

I agree with this explanation as well… And will also effect on 4WS as well…

Anyone here using combo AGX shocks and Eibach springs perhaps? How does it feel?
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Old 12-15-2011, 08:37 PM
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Re: Rear end bouncing/goes by itself

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Originally Posted by sojara View Post
Anyone here using combo AGX shocks and Eibach springs perhaps? How does it feel?
Very good, and mine are at the stiffest dampening front and rear (4 front, 8 rear).
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Old 12-15-2011, 10:46 PM
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Re: Rear end bouncing/goes by itself

Make sure none of ur tires r separete
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Old 12-16-2011, 03:21 AM
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Re: Rear end bouncing/goes by itself

What do you mean with that?
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Old 12-19-2011, 05:04 PM
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Re: Rear end bouncing/goes by itself

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Originally Posted by eludeauthority View Post
Very good, and mine are at the stiffest dampening front and rear (4 front, 8 rear).
Which of AGX do you use?

I have at home those, marked with red square:

Last edited by sojara; 12-19-2011 at 05:30 PM.
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Old 12-19-2011, 07:45 PM
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Re: Rear end bouncing/goes by itself

Test them to make sure they are still good.

1)Any visible oil leaks? Look around the shaft seals.
2)Do they compress smoothly? No gritty or sticking
3)Do they return to full expanded?
If they are good, try them on the car.

Inspect the rear of the car for play in any of the arms and links. If you find any play in the links you should replace what ever is loose.
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Old 12-19-2011, 07:58 PM
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Re: Rear end bouncing/goes by itself

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Which of AGX do you use?
Well, the AGX's are on my Civic not the Prelude so I couldn't help you there.
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