Question about 1999 Lexus RX 300

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Noise coming from control arm i av recently change all front parts an control arm bushing but noise still there. The noise comes mostly wen vehicle is moving slowly, the year of my vehicle is 1999

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Have you replaced the bushings on the sway bar and Strut/shock tower?? When driving slow, is the noise constant or only when bumps are hit?

Posted on Aug 05, 2010

  • kennethphill Aug 08, 2010

    no haven't change the sway bar because they dont need changing an yes i have change the strut/shock tower. the noise comes from the control arm bushing it self wen the nut is loosen no sound comes form it but wen its tighten the noise comes back they have moisture the nut but the noise dont go away. the noise is there even when the vehicle is not driving, wen u rock the vehicle you hear the noise. it has gone on the alinement stand a lot an wen it gose up on it they rock the wheel it self and we hear the noise

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4 main things to check on your particular vehicle. 1. Check your stabilizer bar bushings, make sure there's no play. 2. Your bottom control arm bracket which hold the non-serviceable bushings is probably the culprit. 3. Upper control arm. 4. Ball joint. Most likely it's your bottom control arm bracket. Spray some silicone on each bushing one at a time to narrow down what it is.

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Look into it, but it could be a noise generated from the strut and not from the control arm (or A arm). If it is the control arm that is squeaking, the culprit will most likely be the control arm bushing. I can't tell yo uoff the top of my head but many control arm bushing on newer vehicles are not replaceable and the entire control arm must be replaced as a unit. You might be able to simply buy a bushings and have them replaced. But keep in mind that while you will save part money that way, you will end up paying more for labor. You will also need to have the vehicle aligned after any work is performed to the front end.

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How to change upper control arm on 1996 Honda Civic DX ?


UPPER CONTROL ARM:

Do not disassemble the upper arm. If the ball joint or bushings are faulty, or the upper arm is damaged, the entire upper arm must be replaced.
  1. Raise and support the vehicle safely.
  2. Remove the front wheels. Support the lower control arm assembly with a floor jack.
  3. Separate the upper ball joint from the steering knuckle using a ball joint separator tool.
  4. Remove the self-locking nuts from the upper arm anchor bolts. Remove the upper arm from the vehicle.

Do not disassemble the upper arm. If the ball joint or bushings are faulty, or the upper arm is damaged, the entire upper arm must be replaced.
To install:
Use new self-locking nuts when installing the upper arm and strut.
  1. Install the upper control arm assembly into the strut tower.
  2. Connect the upper ball joint.
  3. Install the front wheels and lower the vehicle.
  4. With all four of the vehicle's wheels on the ground, torque the upper control arm nuts to 47 ft. lbs. (65 Nm). Torque the castle nut to 32 ft. lbs. (44 Nm); then, only tighten it enough to install a new cotter pin.
  5. Tighten the wheel nuts to 80 ft. lbs. (110 Nm).
  6. Check and adjust the vehicle's front end alignment.
The bushings on the front lower control arms are replaceable on most models.
This procedure requires the use of a press and may be above the skill range of the average driveway enthusiast. It is recommended that this procedure be done by a qualified machine shop if you are not skilled in the proper use of a press.
  1. Remove the lower control arm that is in need of new bushings.
It is recommended that both the left and right lower control arm bushings be replaced at the same time. The vehicles handling may become unstable if there are new bushings on one side of the car and worn ones on the other.
  1. Set up the control arm in a press.
  2. Using a impact socket of the correct length and size, press out the old bushing.
  3. Install the new bushing by slowly using the press to push it into the control arm.
  4. WARNINGExcessive force could cause the bushing to bend or tear so be careful.
  5. Once the bushing is properly seated in the control arm, remove the arm from the press and install it on the vehicle.

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Loud clunking noise in front end over bumps


This is most likely one or both of these:

The intermediate steering shaft loses lubrication and develops a clunk - this is an engineering deficiency in many GM products dating back to the early 90s.

and/or

The electrically assisted steering column actually has plastic gears in it which wear down quickly, get sloppy and cause clunking through the steering wheel.

If your car is out of warranty, this will be expensive.

GM knows about both of these issues, and continues to engineer these problems into their products.

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