Strange rattle (b-r-r-r-r-iiiing) from front suspension
#1
Instructor
Thread Starter
Strange rattle (b-r-r-r-r-iiiing) from front suspension
So, I hit a stupid curb that is really badly placed (tons of tire marks on it) but luckily the curb was not high, and then I hear this metallic rattle like when you put a ruler over the age of the desk and pull on it and it rattles like the diving board in a swimming pull... very fast rattle, and I felt a bit of a vibration in the steering wheel as that was going on, and it took maybe even two seconds to fully settle. Something felt too loose definitely.
That did not feel right, so I am wondering if anyone here has any clues what it could be?
I had a mechanic who used to own the same 1st gen ls400 like mine put it on a lift before this happened, and all he said was that right upper control arm is due for a change, although not terrible yet...
Could it be just the UCAs then?
Another thing, don't know if it is related: but my right rotor is warped, and sometimes it produces more vibration sometimes less, depending on the speed and whether the road is perfectly flat or not. If it is bumpy, brakes vibrate lots more, but on a nice smooth road, it is not that bad. It is also quite bad on downhill.
UCAs or something else? (and rotors obviously)
That did not feel right, so I am wondering if anyone here has any clues what it could be?
I had a mechanic who used to own the same 1st gen ls400 like mine put it on a lift before this happened, and all he said was that right upper control arm is due for a change, although not terrible yet...
Could it be just the UCAs then?
Another thing, don't know if it is related: but my right rotor is warped, and sometimes it produces more vibration sometimes less, depending on the speed and whether the road is perfectly flat or not. If it is bumpy, brakes vibrate lots more, but on a nice smooth road, it is not that bad. It is also quite bad on downhill.
UCAs or something else? (and rotors obviously)
#2
Lexus Test Driver
iTrader: (3)
If you want guesses, anything in the front suspension could cause that. From a loose bolt to a worn out joint.
Get the front in the air and start checking it our. Look for my coilover how too thread, I posted a video of how to check ball joints that is far more definitive that the ol shake test.
Get the front in the air and start checking it our. Look for my coilover how too thread, I posted a video of how to check ball joints that is far more definitive that the ol shake test.
#4
Instructor
Thread Starter
I don't think anything is broke, it would take quite a hit, and I was only doing 25-30mph and the curb is only some 4 inches or so... but something's definitely loose.
I guess I will replace the UCA and see if that improves things first. I looked underneath myself, and could not find anything loose, even bushings (that I could see) seemed fine.
I guess I will replace the UCA and see if that improves things first. I looked underneath myself, and could not find anything loose, even bushings (that I could see) seemed fine.
#6
Instructor
Thread Starter
Yeah, UCAs are bad, so they have to go anyway, just didn't think they would be the culprit in this case, but maybe they are... its just so damn hard to tell what it could be, it all seems rock solid. Maybe that noise was normal?
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#8
Instructor
Thread Starter
First there was a professional mechanic who just happened to own this exact same car (1990 ls400), and he said I only need new UCA - he just tested it while it was on the lift, by pushing the wheel with his hands.
Then I looked again on my parking, and nothing else seemed to move (I got underneath it so I could not see as well as he could)
Then I looked again on my parking, and nothing else seemed to move (I got underneath it so I could not see as well as he could)
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