High Pitched Whine (Not Rear End)

[heavymetals]

Originally Posted by ssmith100

Heavy,

Is the pump in the tank or external???? At idle is the pressure a lot lower than during acceleration ????? To me that's what it sounds like but it doesn't do it all the time.

Shane

Pressure is not a lot lower at acceleration or deceleration as the pump runs off the battery.

I had one friend who had a whine like what you describe comming out of one speaker.

Turned out to be a noisy alternator and a bad filter on the amplifier side.

Will be interesting to find out what is causing your complaint.

[ssmith100]

No Maggie here. I do have my system all upgraded but I've shut down power to my aftermarket amps and I still have the noise regardless. It only sounds like it's coming from the right rear of the car though.

Flo,

Is that where yours sounds (right rear) like it's coming from??

I don't really think it's the fuel pump but that's what the sound kinda sounds like. It's very strange that no one else has this problem. On the way home tonight it whined for about the first 20 miles and then just stopped while cruising on the highway about 85. It the strangest thing I've ever seen (heard).

Shane

[keeksv]

Shane:

Does the sound change/go away when you apply the brakes?

Doesn't sound like the fuel pump. May want to give some more thought to the possibility of the half shaft on that side--that is the one that breaks quite often. Did you get new shafts with your diff?

[Florian]

Originally Posted by ssmith100

No Maggie here. I do have my system all upgraded but I've shut down power to my aftermarket amps and I still have the noise regardless. It only sounds like it's coming from the right rear of the car though.

Flo,

Is that where yours sounds (right rear) like it's coming from??

I don't really think it's the fuel pump but that's what the sound kinda sounds like. It's very strange that no one else has this problem. On the way home tonight it whined for about the first 20 miles and then just stopped while cruising on the highway about 85. It the strangest thing I've ever seen (heard).

Shane

Shane,

Yup, right rear...and out of nowhere, the noise will pop up, usually heavy acceleration and/or shifting, which leads me to believe its the rear. Usually dies after a stoplight/sign, etc. But for the life of me, I cant figure it out. It does sound metallic though.

F

[Rich H]

Originally Posted by Florian

Shane,

Yup, right rear...and out of nowhere, the noise will pop up, usually heavy acceleration and/or shifting, which leads me to believe its the rear. Usually dies after a stoplight/sign, etc. But for the life of me, I cant figure it out. It does sound metallic though.

F

EXACTLY what I'm currently experiencing. This problem has been getting gradually worse for the last 1000 miles or so. Started out as a faint mechanical rubbing noise coming from the right rear. Sounds like a warped brake rotor rubbing since it is not a single constant tone. It warbles just as you described. But applying the brakes does not change anything. It occurs at almost any speed above ~30 mph. Doesn't correlate with vehicle or outdoor temp. Comes and goes at will but usually turning right sharply will kill the noise for a while. I'm thinking right rear halfshaft or wheel bearing - it doesn't sound like the rear end. Definitely not a speaker or fuel pump issue.

[Florian]

Originally Posted by Rich H

EXACTLY what I'm currently experiencing. This problem has been getting gradually worse for the last 1000 miles or so. Started out as a faint mechanical rubbing noise coming from the right rear. Sounds like a warped brake rotor rubbing since it is not a single constant tone. It warbles just as you described. But applying the brakes does not change anything. It occurs at almost any speed above ~30 mph. Doesn't correlate with vehicle or outdoor temp. Comes and goes at will but usually turning right sharply will kill the noise for a while. I'm thinking right rear halfshaft or wheel bearing - it doesn't sound like the rear end. Definitely not a speaker or fuel pump issue.

My guess was either the diff carrier bearing or half shaft bearing, guess well find out when it fails.


F

[Rich H]

Originally Posted by Florian

My guess was either the diff carrier bearing or half shaft bearing, guess well find out when it fails.


F

I likely will try to have a dealer listen to it if, and when, the noise becomes more constant. I could use the rear diff bushing replaced as a minimum anyway due to driveline clunking after 23,000 miles on the odometer.

[ssmith100]

Rich H and Flo,

I'm thinking more and more like it's a bearing. The tone does change at times. I believe all my bushing are new since the new rear end carrier came with new bushings. Halfshafts are still original. The sound does sound metallic in nature though. My rear brakes are also starting to squeel a little now and then. The rotors and pads only have about 10,000 miles on them though. Car has 47,000 now. Hopefully one of us soon will find out what it is.

Shane

[ssmith100]

Bumping this. Can anyone verify if the halfshafts have a bearing in them???

Shane

[Lindsay Cadillac]

Originally Posted by ssmith100

Bumping this. Can anyone verify if the halfshafts have a bearing in them???

Shane

Here's an exploded view of the axle shaft... They don't have a bearing in them... The balls marked #4 & #15 don't spin like they would in a bearing...

[ssmith100]

James,

Any ideas !!!!! This is driving me crazy.

Shane

[JOEYCTS-V]

Weird, I noticed a very similar noise that seemed to have started after I installed a 160° thermostat. Coincidence?

[Lindsay Cadillac]

Without hearing the noise it's kind of hard to say... The only TSB dealing with that kind of noise is from the front, specifically the engine compartment, I attached a copy...

Maybe the center support bearing in the driveshaft... Has anyone tried to get the car up in the air and see if you can hear the noise from underneath?? That might at least help pinpointing the area of where it's coming from...

[ssmith100]

Water pump TSB was done. The tech didn't sound to enthused to get the car on the lift and try it that way. He said that it would probably need a load on it to find the problem. Of course when he rode in the car it didn't do it. It sure sounds like it's coming from the right rear from in the car. I''ll see what he says about the center support bearing in the driveshaft.

Thanks as always James.

Shane

[Lindsay Cadillac]

Does it only make the noise while the car is moving??

Does the noise change with vehicle speed??

Like I already said... I'd be getting it up in the air trying to find where it's coming from...