What is this humming sound.....?.
#1
What is this humming sound.....?.
My ES is closer to 250k.
It started emitting a humming noise (under the hood - more precisely on passenger side) about a month back. Two weeks prior to that I had both front shocks replaced with after market one.
I hear the humming sound when I start the car (not in motion) and on any lever (park, drive, reverse etc) position. When in motion I don't hear, may be due to other road noise - not sure.
This is driving me crazy. When I open the hood, I could feel it is coming from passenger side closer to the firewall.
I recorded it posted in youtube :
. Recorded using mobile phone, might want to increase the speaker volume to listen to the humming sound.
What is causing this?. How to fix it?. Any suggestions....?
It started emitting a humming noise (under the hood - more precisely on passenger side) about a month back. Two weeks prior to that I had both front shocks replaced with after market one.
I hear the humming sound when I start the car (not in motion) and on any lever (park, drive, reverse etc) position. When in motion I don't hear, may be due to other road noise - not sure.
This is driving me crazy. When I open the hood, I could feel it is coming from passenger side closer to the firewall.
I recorded it posted in youtube :
What is causing this?. How to fix it?. Any suggestions....?
#3
Thanks ES300NZ for the quick response. I will have transmission checked immediately.
I am not sure if this leads to any clue - I hear this humming sound very clearly when I sit inside, not when standing outside next to the hood (bonnet)!. This is driving me crazy.....
I am not sure if this leads to any clue - I hear this humming sound very clearly when I sit inside, not when standing outside next to the hood (bonnet)!. This is driving me crazy.....
#5
Lexus Champion
You could try eliminating a few things yourself before taking it into the shop.
First, check the transmission fluid, when warm. The level should be at HOT with the car on in Park, and the color should be red. If its brown or black, it needs to be changed.
Next, jackup and support the car from the front so the front wheels are in the air. Chock the back wheels so the car doesn't move. Run through the gears and let the wheels spin (to eliminate the road noise) to see if the noise is speed or RPM dependent, or just an occurrence at idle.
Then remove the alternator belt, and power steering belt. If the noise disappears you can narrow it down to a bad power steering pump bearing or alternator or A/C bearing, or the belt was on too tight.
If the noise is coming from the right side of the motor with the belts off, its probably something under the timing belt cover, like a water pump or idler bearing.
I also noticed your HVAC fan was running...if you turn it off does the noise go away? Especially since you hear the noise more inside the car and outside right near the firewall...
First, check the transmission fluid, when warm. The level should be at HOT with the car on in Park, and the color should be red. If its brown or black, it needs to be changed.
Next, jackup and support the car from the front so the front wheels are in the air. Chock the back wheels so the car doesn't move. Run through the gears and let the wheels spin (to eliminate the road noise) to see if the noise is speed or RPM dependent, or just an occurrence at idle.
Then remove the alternator belt, and power steering belt. If the noise disappears you can narrow it down to a bad power steering pump bearing or alternator or A/C bearing, or the belt was on too tight.
If the noise is coming from the right side of the motor with the belts off, its probably something under the timing belt cover, like a water pump or idler bearing.
I also noticed your HVAC fan was running...if you turn it off does the noise go away? Especially since you hear the noise more inside the car and outside right near the firewall...
#7
Driver School Candidate
As goofy as this sounds, these methods works as you need to refine how you listen to the noise as sound bounces all around in an engine compartment.
1) Take a section of hose, like a garden hose diameter about 3ft long, hold one end to your ear and take the other end and move around the engine in different spots(ac compressor, power steering pump, alternator, intake, etc) to listen for the noise this will help pin point the area. Just make sure to stay clear of the belts.
2) For bad bearing noises, use a wooden post (dowel about 1", 1x1 or even a 2x4) and put the it on the part you want listen to. Place your ear on the board...does not need to be on the end, can be along side. The wood conducts the noise.
3) Get a mechanical stethoscope instead of option 2. They are cheap.
http://www.harborfreight.com/mechani...ope-69913.html
Video for help.
1) Take a section of hose, like a garden hose diameter about 3ft long, hold one end to your ear and take the other end and move around the engine in different spots(ac compressor, power steering pump, alternator, intake, etc) to listen for the noise this will help pin point the area. Just make sure to stay clear of the belts.
2) For bad bearing noises, use a wooden post (dowel about 1", 1x1 or even a 2x4) and put the it on the part you want listen to. Place your ear on the board...does not need to be on the end, can be along side. The wood conducts the noise.
3) Get a mechanical stethoscope instead of option 2. They are cheap.
http://www.harborfreight.com/mechani...ope-69913.html
Video for help.
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#8
Lead Lap
iTrader: (1)
As goofy as this sounds, these methods works as you need to refine how you listen to the noise as sound bounces all around in an engine compartment. 1) Take a section of hose, like a garden hose diameter about 3ft long, hold one end to your ear and take the other end and move around the engine in different spots(ac compressor, power steering pump, alternator, intake, etc) to listen for the noise this will help pin point the area. Just make sure to stay clear of the belts. 2) For bad bearing noises, use a wooden post (dowel about 1", 1x1 or even a 2x4) and put the it on the part you want listen to. Place your ear on the board...does not need to be on the end, can be along side. The wood conducts the noise. 3) Get a mechanical stethoscope instead of option 2. They are cheap. http://www.harborfreight.com/mechani...ope-69913.html Video for help. Video Link: https://www.youtube.com/watch?v=6mpNRJ7m-c8
#10
Driver School Candidate
Join Date: Oct 2018
Location: South Carolina
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2007 lexus is250
I'm having the same problem. I hear it mostly when I park.the car. Sometimes I hear it when the AC is on. I have listened around the engine to find where it's coming from. The air intake trembles (I'm assuming from this noise) and I followed the air intake up to the top of the engine where there is more plastic. That also seems to have noise coming from it.
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