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  #51  
Old 08-05-2016, 07:09 PM
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If anyone wants my old control arms to put new bushings in, I'll make you a deal.

I think that heat accentuates the failing bushings. This morning, when my mechanic checked out my X, we only got it to make the thump noise once, but he could see the play in it when looking at it while I turned the wheel. Temps were over 90 F here today, and when I went to run some errands late afternoon after it was out in the sun all day, it was making that sound on every turn. I assume this is because the rubber softens in the heat.
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  #52  
Old 08-12-2016, 10:11 PM
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New control arms and ball joints are in; noise is gone!

If anyone wants my old, OEM control arms to re-pack with new bushings, you can have them for the cost of shipping (they are very heavy, but should fit in a large USPS flat-rate box)
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  #53  
Old 03-19-2018, 08:48 AM
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Well, I replaced my upper control arms (thrust arms) in Aug, 2016, and now, only 15,000 miles later, the thumping sound on sharp turns at slow speeds has returned. I suspect it is the thrust arm bushings again, already. I haven't had a chance to inspect them yet but will today. I bought the Lemforder thrust arms from RMEuropean - now I wish I had got them from FCP, as I believe they offer a lifetime guarantee.

If it isn't the thrust arm bushings, what else should I look at for sharp turn thumping? CV joints?

In Dec, 2017, I replaced the lower control arms (wishbones) and the sway bar end links when I was getting another thumping/clicking sound on slight turns on uneven surfaces at slow speeds and braking vibration when braking at 50-60 mph. When it was up on the lift at that time, the CV boots didn't appear to have any cracks, etc..

Since I still have my old thrust arms, I think I might get the Powerflex urethane bushings. I read in one of the threads that bimmerworld will repack these into my control arms for $10, but I couldn't find anything about that on their site. Does anyone know about this? I think my indy mechanic mentioned someone local that will pack bushings also, so I could check on that.
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  #54  
Old 03-19-2018, 12:09 PM
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Quote:
Originally Posted by TiminIndy View Post
Well, I replaced my upper control arms (thrust arms) in Aug, 2016, and now, only 15,000 miles later, the thumping sound on sharp turns at slow speeds has returned. I suspect it is the thrust arm bushings again, already. I haven't had a chance to inspect them yet but will today. I bought the Lemforder thrust arms from RMEuropean - now I wish I had got them from FCP, as I believe they offer a lifetime guarantee.

If it isn't the thrust arm bushings, what else should I look at for sharp turn thumping? CV joints?

In Dec, 2017, I replaced the lower control arms (wishbones) and the sway bar end links when I was getting another thumping/clicking sound on slight turns on uneven surfaces at slow speeds and braking vibration when braking at 50-60 mph. When it was up on the lift at that time, the CV boots didn't appear to have any cracks, etc..

Since I still have my old thrust arms, I think I might get the Powerflex urethane bushings. I read in one of the threads that bimmerworld will repack these into my control arms for $10, but I couldn't find anything about that on their site. Does anyone know about this? I think my indy mechanic mentioned someone local that will pack bushings also, so I could check on that.
I have Powerflex bushings in the thrust arms, the Purple ones, you can now get different color Powerflex bushings for different stiffness however, the Purple on 19"s with the sport suspension is firm enough for me. I don't want it any firmer.
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  #55  
Old 03-19-2018, 04:29 PM
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Bimmerworld said they can press the bushings in for me, but only if I buy new thrust arms, which are $150 each from them. Hopefully I can find someone local to do it for me on my old ones - doesn't sound like something I care to do myself.
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  #56  
Old 03-20-2018, 03:41 PM
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My noise was motor mounts. Noise went away and never came back.

Edit.....Oops add thrust bushings as well
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Last edited by Quicksilver; 03-21-2018 at 03:03 PM.
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  #57  
Old 03-20-2018, 10:16 PM
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I inspected my CV boots and control arms today. All of the CV boots are fully intact and clean as a whistle. The thrust arm bushings still look like new, but I didn't have anyone around to turn the wheel so I could see what they look like on sharp turns. I know that the sharp turn noise was fixed last time by replacing these, but I just find it hard to believe that the Lemforder thrust arm bushings would fail after 19 months and 15,000 miles.

Then I started thinking it might be the tie rod ends. The ball joints on the end of those look fine, but those are the only ball joints up front that haven't been recently replaced.
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  #58  
Old 03-20-2018, 11:52 PM
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the thrust bushings when fail will allow the wheels to move quite a lot (over half an inch) when braking at slow speeds; you can feel the 'thump' but you can just stick a camera phone out the window and at 5mph hit the brakes hard and the wheel will visibly move back quite a bit. It makes a soft thump and shouldn't repeat or have much effect from steering only braking.

A creaking click-click especially if when not moving is almost certainly a ball-joint, and tie rod would be my #1 suspect. If the tie rod ball is covered with a rubber boot and you are anticipating replacement already anyhow, cut a small slit in the rubber boot, shoot some WD 40 in there and the clicks/clunks will vaporize if it's that ball joint.

I had that problem on a previous car and the WD40 fix worked for a month or two while i saved up for the replacement parts.
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