Strange hum in the back
#1
Lead Lap
Thread Starter
Strange hum in the back
A couple of months ago I noticed a strange hum at 45 mph when the car was coasting--not at braking or acceleraating. First they said it was the brakes. At 67,000 miles I didn't really know. They were changed. It wasn't the brakes. The noise was still there. The mechanic rode in the car, climbed in the back of the RX and listened more. He determined it was the Differential. They ordered and changed the differential. The noise was still there only now it was at 30 mph only. Then they said it was the bearings. They changed one side. You guessed it, the noise was still there. They didn't even bother to return the car they ordered the other side. Now the car has been returned and it seems ok. I'm almost afraid to hear the noise. Anyone else experience this on a 1999 RX 300?
#2
Yes. I drove the LFA.
iTrader: (9)
Ive heard of this issue before.. its actually usually not the bearing itself, its the dust shield behind it. But its common practice to replace the bearing at the same time. Usually a simple squirt of bearing grease in there will stop the noise.. but whenever i come across the problem, replacement of the part is the first thing we do. I hope all those parts were replaced under warranty and you didnt have to pay for it all... good luck with the car, hope its trouble free from now on
#3
Lead Lap
Thread Starter
After 2 weeks of driving I've concluded that the hum is still there, but at 25 mph coasting--not accelerating or braking. They have no clue as to what it is. Any other suggestions?
#4
Yes. I drove the LFA.
iTrader: (9)
Originally posted by LexRexBlue
After 2 weeks of driving I've concluded that the hum is still there, but at 25 mph coasting--not accelerating or braking. They have no clue as to what it is. Any other suggestions?
After 2 weeks of driving I've concluded that the hum is still there, but at 25 mph coasting--not accelerating or braking. They have no clue as to what it is. Any other suggestions?
#6
Yes. I drove the LFA.
iTrader: (9)
Originally posted by LexRexBlue
They are Michelin Cross Terrain. They have been on the car almost a year now. What are cupped tires?
They are Michelin Cross Terrain. They have been on the car almost a year now. What are cupped tires?
#7
Lead Lap
Thread Starter
Thanks. I'll make sure they check when I bring the car in on Thursday. They are supposed to have a diagnostic mechanic drive with me to hear the noise. Would the sound from the cupping occur every time I'm at a specific speed, or just some times? It only occurs at odd times including every morning.
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#8
Lexus Champion
You may need to ask them to check the exhaust hanger or exhaust pipe. You may backed into something and slightly bend the exhaust pipe a little bit, enough for the exhaust pipe to tough the body or some part of the car and make this humming noise.
I don't know what else can make this humming noise beside Differential, wheel bearing and cupped tire. They did everything they could, except checking on the exhaust hanger or the tow hook on the right rear by the muffler.
You can ask them to rotate the tires from back to front, test drive the car and see if the noise goes from back to front. If the noise still in the back , then it's not the tires,not the rear diff, not the rear wheel bearings, because they already replaced them. Ask them to look at something obvious under the car. For example, bend exhaust pipe, bend heat shield, or any under body covers that not in place and touching the body of the car.
I don't know what else can make this humming noise beside Differential, wheel bearing and cupped tire. They did everything they could, except checking on the exhaust hanger or the tow hook on the right rear by the muffler.
You can ask them to rotate the tires from back to front, test drive the car and see if the noise goes from back to front. If the noise still in the back , then it's not the tires,not the rear diff, not the rear wheel bearings, because they already replaced them. Ask them to look at something obvious under the car. For example, bend exhaust pipe, bend heat shield, or any under body covers that not in place and touching the body of the car.
Last edited by VVT-i; 10-08-04 at 07:51 PM.
#9
Lead Lap
Thread Starter
Thanks. I'll print this up and run it by them. Fortunately, they are very nice at the Lexus service. If I wasn't planning on giving this car to my son to drive I'd probably just let it go since I have ordered a new one--even if it doesn't come until April!
#11
Lead Lap
Thread Starter
Ah Yes. The new car is supposed to be the hybrid. I'm hoping it'll arrive in Feb. instead of March because my son will be pressuring me for my car. I saw it at the Lexus Taste of Luxury, but I wonder how it will drive. I'm not so confident that this whole process will work out smoothly.
#12
Lead Lap
Thread Starter
The car was checked "cold". They heard the noise and now they believe it is the transmission! I hope this is it. Meanwhile I'm happy to drive a new RX loaner.
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