What is this part and is what's making my noise? - Lexus IS Forum
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post #1 of 46 (permalink) Old 02-25-2017, 08:38 AM Thread Starter
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What is this part and is what's making my noise?

Hello all!

So I'm not a mechanic at all but today I decided to do my brakes and I noticed a problem.

Some background, I've been hearing a sort of "clunk" noise whenever I reverse out from my parking spot. Basically when I park at work, I have to turn into my spot and I end up with my wheels turned all the way left at times. When I leave and I reverse, when I turn the wheel the other way to reverse out, almost as soon as I turn, I hear a "clunk." Then when I'm out and i turn again, I'll hear it one more time.

Rarely do I hear it on the road. I think it's during extreme turns but funny thing is i can't always reproduce it.

I thought maybe tie rod ends but today as I changed my brakes I noticed the piece in the photos was a little messed up. Any help? I have no clue what this piece is or what it does. Would it cuz the "clunk" noise?

Last edited by noloc4545; 03-01-2017 at 07:37 PM.
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post #2 of 46 (permalink) Old 02-25-2017, 12:53 PM
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That is the Front Lower Control Arm (rear position) There are 2 lower control arms. The other (front) position, is what you have support underneath your jackstand.

The bushing in that control arm is definitely done. You can either replace the whole arm or if you have access to a hydraulic press. You can just buy the stand alone bushing, press out the old ones, and then press in the new one.

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post #3 of 46 (permalink) Old 02-25-2017, 04:39 PM
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I highly recommend the figs LCA2 bushing. Its a poly bushing and will not deform on braking. If you notice inner tire wear, that can result from bad LCA2 bushings.

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post #4 of 46 (permalink) Old 02-26-2017, 09:00 PM Thread Starter
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Thanks guys! I don't have a press so I'll just buy the entire arm.

I saw a video, seems pretty simple.

Remove screws, pull out, put new one in (bang with rubber mallet), rescrew and go.
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post #5 of 46 (permalink) Old 02-27-2017, 09:30 AM
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Make sure you get an alignment after replacing the arm. The No. 2 arm bushing is probably so bad that it has caused your alignment to go off.

Also, I'm curious how many miles you have on the car?

02' Manual w/MKIII LSD and no sunroof.
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post #6 of 46 (permalink) Old 02-28-2017, 01:06 PM Thread Starter
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Originally Posted by Piggity View Post
Make sure you get an alignment after replacing the arm. The No. 2 arm bushing is probably so bad that it has caused your alignment to go off.

Also, I'm curious how many miles you have on the car?
Yea. I discovered the problem a little late. Installed new rotors brakes last week. A couple of hours ago had new tires put in. And I'm still waiting for the dang parts to come in for this. They were suppose to arrive today but Amazon is slacking right now which sucks. Is a few days of uneven/equal parts going to screw me over?

I have a 147k. Runs like a champ.
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post #7 of 46 (permalink) Old 02-28-2017, 03:35 PM
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It shouldn't be a problem.

02' Manual w/MKIII LSD and no sunroof.
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post #8 of 46 (permalink) Old 02-28-2017, 04:25 PM
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If they have been that way for a while. You may need to replace the lower ball joints also. Happened to me.
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post #9 of 46 (permalink) Old 02-28-2017, 05:40 PM Thread Starter
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Quote:
Originally Posted by 01 SolarYellow View Post
If they have been that way for a while. You may need to replace the lower ball joints also. Happened to me.
Err...other than a visual inspection, how could I determine this?
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post #10 of 46 (permalink) Old 03-03-2017, 08:09 PM
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Hey got a question on the right rear tire you mentioned having a forward and rear control arm . All I'm able to find is a control arm for the front end. I have no clue if it matters or not. This is my first car I'm building I come from trucks and jeeps. So any help would be appreciated
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post #11 of 46 (permalink) Old 03-03-2017, 09:53 PM
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Well you can pry and see if you get any up and down movement. But that is no garantee. Mine did not move any amount I coud tell. But as soon as I replaced them the issue went away.
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post #12 of 46 (permalink) Old 03-06-2017, 10:01 AM Thread Starter
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Originally Posted by 01 SolarYellow View Post
Well you can pry and see if you get any up and down movement. But that is no garantee. Mine did not move any amount I coud tell. But as soon as I replaced them the issue went away.
I visually inspected them and they looked fine. I didnt want to poke at them though.

Also, changed my LCA#2 as of right now, I havent heard the noise when I pull out from the parking lot.

To refresh, any time I parked at work, I basically do a u-turn into my spot so my wheel is 100% turned to the left. When I pull out I have to straighten out and when I turn the wheel to the right, it immediately makes a "clunk" or "pop" sound like two metal parts just popped into place. but I have to turn hard right to back out as well and when I turn again from that, it pops again.

So that SEEMS to be gone now.

My problem (mentioned in another post) is that Im getting bad vibration from stopping "hard." The LCA fix seemed to have improved that a little bit as I no longer feel the vibration in my brake pedal or wheel. Where prior to the change, I could feel it well in both.

I have nEW rotors and brakes and did the break-in process as described to the best of my ability.

So any ideas on what else could cause that?

Last edited by noloc4545; 03-06-2017 at 11:13 AM. Reason: ***I CAN SPELL I PROMISE***
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post #13 of 46 (permalink) Old 03-06-2017, 11:11 AM
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Tie rods and lower ball joints. Its time to take a closer look
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post #14 of 46 (permalink) Old 03-06-2017, 11:14 AM Thread Starter
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Originally Posted by IM QUIKR View Post
Tie rods and lower ball joints. Its time to take a closer look
You think those are causing the vibration when I brake?
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post #15 of 46 (permalink) Old 03-07-2017, 09:14 AM Thread Starter
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Quote:
Originally Posted by IM QUIKR View Post
Tie rods and lower ball joints. Its time to take a closer look

So I ordered tie rods (inner & outer) and lower ball joints.

This morning I took it to my local shop down the road (local...no name brand) and they lifted the car up and checked everything for me. They moved the tire left and right and other things aside from visual inspections.

They said everything looks good, sounds good, feels good.

That it must be warped rotors....

Im going to contact summit racing (where I got the rotor/brake sets) about a refund/replacement.

Any thoughts?
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