Humming noise on a 99
06-18-19, 10:56 PM
#1
Racer
Thread Starter
Humming noise on a 99
All major fixes done. Last repair besides hunting the noise is rear brakes. Have the rotors and pads but haven't done them yet. Will be done next weekend.
Now to tackle a humming noise. I have this noise that gets louder the faster I go from 45 and up. Replaced one bad wheel bearing checked the others. Got new tires. Balanced twice. Replaced front rotors and brakes. Replaced engine and tranny mounts. Had rims checked for bends. Replaced tranny filter and fluid twice. Replaced drive shaft center mount. Had drive shaft checked. Diff fluid changed. Replaced all ripped bushings in pairs. However a similar noise presents itself when revving at idle. I'ma rev at 2500 rpm tomorrow morning and see if it sounds the same. Could be a pulley? Edit: While some vibration no noise.
When at around 60 to 70 the noise turning to a groaning hum and changes pitch from high to low then back to high and repeat the whole time. It sounds like it's coming from the front.
Edit: I put it in neutral while at 70 noise remains
Edit: should note I didn't do these repairs based on the noise, they were needed as they were bad or worn/ripped.
Now to tackle a humming noise. I have this noise that gets louder the faster I go from 45 and up. Replaced one bad wheel bearing checked the others. Got new tires. Balanced twice. Replaced front rotors and brakes. Replaced engine and tranny mounts. Had rims checked for bends. Replaced tranny filter and fluid twice. Replaced drive shaft center mount. Had drive shaft checked. Diff fluid changed. Replaced all ripped bushings in pairs. However a similar noise presents itself when revving at idle. I'ma rev at 2500 rpm tomorrow morning and see if it sounds the same. Could be a pulley? Edit: While some vibration no noise.
When at around 60 to 70 the noise turning to a groaning hum and changes pitch from high to low then back to high and repeat the whole time. It sounds like it's coming from the front.
Edit: I put it in neutral while at 70 noise remains
Edit: should note I didn't do these repairs based on the noise, they were needed as they were bad or worn/ripped.
Last edited by Sin1UZFE; 06-19-19 at 09:16 AM.
06-18-19, 11:08 PM
#3
Racer
Thread Starter
06-19-19, 07:12 AM
#4
If it is at one certain speed, or thereabout (say 50mph), it could be your differential. I have the same problem and it only happens at 65mph, because the old lady who owned it before me always drove the car at that speed (on highway). Probably had her cruise setup like that and used it at the same speed for 20 years.
At the advice of my mechanic, I just live with it, although, I will replace the differential eventually, especially if the hum become worse.
And, no, it does not sound like it's coming from the back (low frequency sounds are hard to determine where they come from due to their long soundwaves. That's why we use only one subwoofer in our home theaters), although when my son sits in the back seat, he says that to him it sounds like it's coming from the back.
At the advice of my mechanic, I just live with it, although, I will replace the differential eventually, especially if the hum become worse.
And, no, it does not sound like it's coming from the back (low frequency sounds are hard to determine where they come from due to their long soundwaves. That's why we use only one subwoofer in our home theaters), although when my son sits in the back seat, he says that to him it sounds like it's coming from the back.
06-19-19, 07:36 AM
#5
Racer
Thread Starter
If it is at one certain speed, or thereabout (say 50mph), it could be your differential. I have the same problem and it only happens at 65mph, because the old lady who owned it before me always drove the car at that speed (on highway). Probably had her cruise setup like that and used it at the same speed for 20 years.
At the advice of my mechanic, I just live with it, although, I will replace the differential eventually, especially if the hum become worse.
And, no, it does not sound like it's coming from the back (low frequency sounds are hard to determine where they come from due to their long soundwaves. That's why we use only one subwoofer in our home theaters), although when my son sits in the back seat, he says that to him it sounds like it's coming from the back.
At the advice of my mechanic, I just live with it, although, I will replace the differential eventually, especially if the hum become worse.
And, no, it does not sound like it's coming from the back (low frequency sounds are hard to determine where they come from due to their long soundwaves. That's why we use only one subwoofer in our home theaters), although when my son sits in the back seat, he says that to him it sounds like it's coming from the back.
06-19-19, 08:08 AM
#6
Moderator
Why don't you set up a microphone to places where you suspect? I always do this way and I can find the sound source easily and quickly. To use a stereo microphone is quite effective. It is also a good idea to share the sound to us. Someone might give you some good information.
06-19-19, 08:09 AM
#7
Racer
Thread Starter
Why don't you set up a microphone to places where you suspect? I always do this way and I can find the sound source easily and quickly. To use a stereo microphone is quite effective. It is also a good idea to share the sound to us. Someone might give you some good information.
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06-19-19, 10:05 AM
#8
Racer
Thread Starter
Dropped it off to another mechanic for a $85 diagnosis
Says it's this
https://www.ebay.com/p/4l60e-Rear-Pl...l65e/851748497
Anyone know it's part number?
Says it's this
https://www.ebay.com/p/4l60e-Rear-Pl...l65e/851748497
Anyone know it's part number?
Last edited by Sin1UZFE; 06-19-19 at 12:00 PM.
06-20-19, 10:15 AM
#9
Interesting... but yet you can hear it at idle and when in neutral while doing 70 MPH. Not sure what the planetary gear does, but don't think it would be engaged when in park and in neutral when you still hear the noise.
But if the tech had it up on the rack and in drive and could isolate the noise to that instead of just guessing then I guess that could be the culprit. Based on your description, I would not have looked at that. More like a bearing in the idler arm or alternator or PS pump. Good luck with the repair.
But if the tech had it up on the rack and in drive and could isolate the noise to that instead of just guessing then I guess that could be the culprit. Based on your description, I would not have looked at that. More like a bearing in the idler arm or alternator or PS pump. Good luck with the repair.
06-20-19, 10:19 AM
#10
Racer
Thread Starter
Interesting... but yet you can hear it at idle and when in neutral while doing 70 MPH. Not sure what the planetary gear does, but don't think it would be engaged when in park and in neutral when you still hear the noise.
But if the tech had it up on the rack and in drive and could isolate the noise to that instead of just guessing then I guess that could be the culprit. Based on your description, I would not have looked at that. More like a bearing in the idler arm or alternator or PS pump. Good luck with the repair.
But if the tech had it up on the rack and in drive and could isolate the noise to that instead of just guessing then I guess that could be the culprit. Based on your description, I would not have looked at that. More like a bearing in the idler arm or alternator or PS pump. Good luck with the repair.
06-20-19, 10:20 AM
#11
Racer
Thread Starter
Since work is on surface streets and 5 miles away I was not able to get an audio recording. But once I get on the freeway I will
06-22-19, 09:07 PM
#12
Racer
Thread Starter
What are the chances there is an issue with ebrake? Rubbing on the rotor etc. Something that wasn't mentioned
Don't think one can tell from this recording but here it is
https://drive.google.com/file/d/1Onctf470MGUErLVw0kZF7fZScUr023gn/view?usp=drivesdk
Paid attention and it does sound it's coming from the front. Namely the left. Kinda feels like the bearing is the culprit but two different mechanics say they are good.
Don't think one can tell from this recording but here it is
https://drive.google.com/file/d/1Onctf470MGUErLVw0kZF7fZScUr023gn/view?usp=drivesdk
Paid attention and it does sound it's coming from the front. Namely the left. Kinda feels like the bearing is the culprit but two different mechanics say they are good.
Last edited by Sin1UZFE; 06-22-19 at 09:14 PM.
06-23-19, 07:09 PM
#13
Pole Position
What are the chances there is an issue with ebrake? Rubbing on the rotor etc. Something that wasn't mentioned
Don't think one can tell from this recording but here it is
https://drive.google.com/file/d/1Onc...w?usp=drivesdk
Paid attention and it does sound it's coming from the front. Namely the left. Kinda feels like the bearing is the culprit but two different mechanics say they are good.
Don't think one can tell from this recording but here it is
https://drive.google.com/file/d/1Onc...w?usp=drivesdk
Paid attention and it does sound it's coming from the front. Namely the left. Kinda feels like the bearing is the culprit but two different mechanics say they are good.
06-23-19, 08:44 PM
#14
Racer
Thread Starter
Not the E-brake. The mechanic definitely would have heard that while it was on the lift. Plus, that would be a scraping, not humming. If it sounds like a bearing in one of the pulleys you can always just take off the belt and take it for a short drive to see if it's gone. You wont have power steering and battery wont charge but a little drive wont hurt.
A few weeks ago an AC line snapped off and hit the belt hard enough to knock it off, I drove it 3 miles home and still heard it. I'ma take to another mechanic to check on friday
Last edited by Sin1UZFE; 06-23-19 at 09:37 PM.
06-23-19, 09:19 PM
#15
Racer
Thread Starter
Couldn't hear anything tho. Had the wife hold it at 2500rpm. Maybe someone with more ls experience can tell.
Last edited by Sin1UZFE; 06-23-19 at 09:37 PM.