1999 Lexus RX 300 Front Knock

1999 LEXUS
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RX300
  • MEMBER
  • 1 POST
HI
I HAVE AN RX300 THE PASSENGER SIDE FRONT MAKES A LOUD KNOCKING SOUND WHEN I HIT A BUNP.
1. IF I GO SLOWLY OVER A SPEED BUMP CAR BOUNCE'S UP AND DOWN FINE NO NOISE
2. WHEN I HIT A BUMP OR POT HOLE A NORMAL SPEEDS I GET A LOUD KNOCKING SOUND
3. I HAVE GONE BACK AND FORTH OVER BUMPS TO TEST THE FACT THAT THE KNOCKING DOES NOT HAPPEN WHEN THE BRAKES ARE APPLIED
4.THE STEERING WHEEL HAS STARTED TO WOBBLE SLOWLY AND SEEMS TO BE GETTING WORSE
5. I HAVE HAD THE TIRE OFF 3 TIMES AND CAN NOT FIND ANYHTHING LOSE :IE BALL JOINTS CV JOINTS TIE RODS ETC
1999 LEXUS RX300 AWD 127K MILES
THANKS IN ADVANCE FOR ANY HELP
Jan 28, 2007 at 3:38 AM
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2CARPRO JACK
  • ✓Experienced Mechanic
  • 11,533 POSTS
Could be the top strut mount. Toyotas should have them replaced anytime struts are done on the car. its basically a bearing/pivot plate on top of the strut that allows it to turn
Jan 28, 2007 at 11:33 PM

Suggested Repair

Inspect the passenger-side front strut mount (the bearing/pivot plate on top of the strut) and replace it if worn, especially if the struts have been serviced.

Conversation Summary

The owner of a 1999 Lexus RX 300 AWD with 127,000 miles reports a loud passenger-front knock over bumps at normal speed, but not when going slowly or while braking. The steering wheel has also begun to wobble and is getting worse. Ball joints, CV joints, and tie rods were checked and found tight. The expert suggests a worn top strut mount, which should be replaced whenever struts are serviced.

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