Humming noise - JeepForum.com

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post #1 of 47 Old 03-14-2012, 05:35 PM Thread Starter
WJMay
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2000 WJ 
 
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Location: acworth
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Humming noise

So every time I step on the gas, there's this humming noise that gets progressively louder. When I let go of the gas, it goes away. Does anyone want to shed some light on this?

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post #2 of 47 Old 03-14-2012, 06:41 PM
duanewhatley
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I have this too. Hope you get an answer.
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post #3 of 47 Old 03-14-2012, 06:46 PM
cherokee00SE
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2000 WJ 
 
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i have something like this too, although id describe mine as more of a whine. ill be watching this thread as well
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post #4 of 47 Old 03-14-2012, 07:09 PM
Jcurl
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2001 WJ 
 
Join Date: Dec 2010
Location: Cypress
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I am having something similar also mine started after I put an IRO 6.5" la kit. It's mainly at low speed like 20 mph with my foot off the gas its like a roar. Someone please help us.
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post #5 of 47 Old 03-14-2012, 07:11 PM
duanewhatley
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1999 WJ 
 
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Mine stops when you let off the gas. 4.7, 45re, 2.5 inch Rusty's lift, 245,75,16 bfg all terrains. Replaced all fluids except front diff, gonna do that Friday.
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post #6 of 47 Old 03-14-2012, 07:39 PM
speedyjeep
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Quote:
Originally Posted by duanewhatley View Post
Replaced all fluids except front diff, gonna do that Friday.
I think this could be the problem, or at least i hope it is...i have the same type of noise coming from under the chassis and it sounds like the diff is time for a change and i also plan to change my diff fluid + transfer case fluid friday morning

'00 Jeep Grand Cherokee Limited 4.7L V8 4x4,
-Shocks = Edelbrock 3321(Front)/34404(Rear)
-Direct fit high-flow magnaflow catalytic converter
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post #7 of 47 Old 03-14-2012, 07:41 PM
duanewhatley
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Quote:
Originally Posted by speedyjeep View Post
I think this could be the problem, or at least i hope it is...i have the same type of noise coming from under the chassis and it sounds like the diff is time for a change and i also plan to change my diff fluid + transfer case fluid friday morning
I'm hoping your right.
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post #8 of 47 Old 03-14-2012, 08:13 PM Thread Starter
WJMay
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Lol! Well I'm glad I'm not the only one with this problem! No answer yet?!?!?
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post #9 of 47 Old 03-14-2012, 08:21 PM
peytonimor7
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Front diff could possibly be the problem but not as likely I don't think... seeing as how when you gas it (if you have the 247) then 4x4 shouldn't really kick in on dry pavement going straight. Could be a wheel bearing as well. I've heard a good many people say they have a whine in their belt and it could maybe be power steering, but you're going straight so not as likely. My power steering whines like hell... I also noticed when park today I was turning the wheel listening to the PS and my RPM's were fluctuating... doesn't sound good especially with the hellish whine.

I'd say your best bet would be a wheel bearing or the belt.

l 04 WJ l OME HD+3/4" spacers l Bilstein 5100 l 245/70/17 Firestone M/Ts l IRO A-Arm & CAs F & R l
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post #10 of 47 Old 03-14-2012, 08:58 PM
tvann
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1999 WJ 
 
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I have the same exact problem as well posted a thread about it maybe a week ago. I changed the diff fluid and checked the diff gears and bearings and they all seem to be in good shape. Cleaned it up and put fresh fluid but the sounds still there. Hope we all find an answer.
Btw what drive shaft do you guys have?

Its better to be dead and cool than alive and uncool.
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post #11 of 47 Old 03-14-2012, 10:24 PM
OTownDaddy
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I have the same issue. I would describe it as a "woooo" that seems to progress in pitch with the RPMs. I've changed everything fluid wise. I also have a whine (power steering/alternator/water pump area) but that's not it. I'm starting to think that it is the air intake possibly. Maybe something like the air being taken in and it woooos or whistles.

It would be so cool if someone had an answer, just to know.

2007 XK Limited 4x4 | QD-II | 18" wheels (gotta dump these for some 17s) | The rest is stock
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post #12 of 47 Old 03-14-2012, 10:30 PM
MoparMan1990
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1992 XJ Cherokee 
 
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Same here!!! From the front changed fluid gears looked good no play in either wheel removed the ds still doing it just not as loud
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post #13 of 47 Old 03-14-2012, 10:54 PM
USFORCES
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Find a good mechanic to drive it maybe he could tell you, it's worth a shot my buddy that's been a mechanic a long time can tell me stuff just by driving it that I didn't even know was bad or what the problem was, lol

04 Overland on 33's, Lift & tires= 8" over stock.
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post #14 of 47 Old 03-15-2012, 12:23 AM
Overdoseland
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Quote:
Originally Posted by OTownDaddy View Post
I have the same issue. I would describe it as a "woooo" that seems to progress in pitch with the RPMs. I've changed everything fluid wise. I also have a whine (power steering/alternator/water pump area) but that's not it. I'm starting to think that it is the air intake possibly. Maybe something like the air being taken in and it woooos or whistles.

It would be so cool if someone had an answer, just to know.

I also have that noise, seems like it's coming from the rear. Someone mentioned possibly carrier or pinion bearings. Could also be u-joint? I'm not sure but today when I had my 02 Overland jacked up and started. I hear that distinct woowoowoo sound coming from my exhaust pipe. I'm thinking maybe the baffles inside the muffler is making that noise.

When I'm driving, the noise progresses when accelerating and I hear it intermittently when coasting sometimes so I'm probably thinking more like a bearing somewhere in the driveline. I just did all the fluid change except for the coolant and my gears in the diffs look fine. Transfer case fluid was almost black. I'm thinking of bringing it into a driveline specialist to have them look at it unless someone knows foresure whats making that noise.
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post #15 of 47 Old 03-15-2012, 06:19 AM
speedyjeep
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ive also heard that this is a pretty common problem with jeeps our model and that its nothing to worry about...but if your like me, the only noise you wanna hear should come from the engine when you hit the throttle

'00 Jeep Grand Cherokee Limited 4.7L V8 4x4,
-Shocks = Edelbrock 3321(Front)/34404(Rear)
-Direct fit high-flow magnaflow catalytic converter
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