Please help me diagnose this noise...
#1
Please help me diagnose this noise...
Okay, so here's the description:
- Hum/moan type sound from rear end. Kind of sounds like a swarm of bees caught in a coffee can.
- Doesn't change pitch or volume with changing speed.
- I hear it mostly over my left shoulder.
- Starts around 25 mph. Constant after that.
- No change on acceleration or deceleration.
Any suggestions? I'm just as interested to know what it CAN'T be. Tranny? Differential? Tire Noise? Wheel Bearing? Exhaust? If anyone can rule anything out I'd be grateful. It's driving me freaking nuts. It's going in on the 30th.
- Hum/moan type sound from rear end. Kind of sounds like a swarm of bees caught in a coffee can.
- Doesn't change pitch or volume with changing speed.
- I hear it mostly over my left shoulder.
- Starts around 25 mph. Constant after that.
- No change on acceleration or deceleration.
Any suggestions? I'm just as interested to know what it CAN'T be. Tranny? Differential? Tire Noise? Wheel Bearing? Exhaust? If anyone can rule anything out I'd be grateful. It's driving me freaking nuts. It's going in on the 30th.
#2
RE: Please help me diagnose this noise...
ORIGINAL: richmod
- Hum/moan type sound from rear end. Kind of sounds like a swarm of bees caught in a coffee can.
- Doesn't change pitch or volume with changing speed.
- Hum/moan type sound from rear end. Kind of sounds like a swarm of bees caught in a coffee can.
- Doesn't change pitch or volume with changing speed.
Seriously though...
If it is actually constant with speed and kicks in at 25MPH, I would be tempted to guess groaning fuel pump... I am fresh from 5 days of driving a loaner (wife's car being repaired - not the mustangs), with such a thing, so I am sensitive to this one...
If it increases with turns and or it varies with speed, then clutch pack (TSBs on that) or possibly ventrilaquist power steering pump... Either of those WILL vary with speed though, so my"final answer" (er random out of the air guess) is fuel pump...
If you pull out your rear seat and pop the lid off the access to the fuel pump and it gets a louder that would give you an answer...
#3
RE: Please help me diagnose this noise...
Not to hijack a thread, but I figured while this is up I might as well add a noise for those that are reading, so there doesn't need to be a "Help me identify this noise II" (Sorry Richmond, I have no clue btw.)
A rattle undernearth the car, beneath the shifter/console as a rough estimate. When I accelerate going up a slight hill it sounds like thin metal just vibrating like crazy against something.
While trying to locate the sound I also gradually accelerated and brought the RPMs up to 4k before shifting, and the same sound was achieved.
Initially I thought it was the heat shields, and it may be as the bolts holding them on aren't placed very well. While I was beneath the car, I tightened everything I could, but everything seemed to be snug. I tried pulling, shaking, and pushing on everything that came to mind. The heat shield was the only thing to "rattle" when I tapped it. I did a few small alterations on it "Just bending it slightly. -- Not to the point where you can see it bend, though -- and then tapped it and it was a solid sound, so I figured the problem was fixed. Wrong.
I'm up for suggestions,
Thanks.
PS, Sorry again Richmond, but I figure it's better to keep this all in one area rather then a forum full of 10 posts on the same topic.
A rattle undernearth the car, beneath the shifter/console as a rough estimate. When I accelerate going up a slight hill it sounds like thin metal just vibrating like crazy against something.
While trying to locate the sound I also gradually accelerated and brought the RPMs up to 4k before shifting, and the same sound was achieved.
Initially I thought it was the heat shields, and it may be as the bolts holding them on aren't placed very well. While I was beneath the car, I tightened everything I could, but everything seemed to be snug. I tried pulling, shaking, and pushing on everything that came to mind. The heat shield was the only thing to "rattle" when I tapped it. I did a few small alterations on it "Just bending it slightly. -- Not to the point where you can see it bend, though -- and then tapped it and it was a solid sound, so I figured the problem was fixed. Wrong.
I'm up for suggestions,
Thanks.
PS, Sorry again Richmond, but I figure it's better to keep this all in one area rather then a forum full of 10 posts on the same topic.
#4
RE: Please help me diagnose this noise...
ORIGINAL: cekim
If it is actually constant with speed and kicks in at 25MPH, I would be tempted to guess groaning fuel pump... I am fresh from 5 days of driving a loaner (wife's car being repaired - not the mustangs), with such a thing, so I am sensitive to this one...
If it increases with turns and or it varies with speed, then clutch pack (TSBs on that) or possibly ventrilaquist power steering pump... Either of those WILL vary with speed though, so my"final answer" (er random out of the air guess) is fuel pump...
If you pull out your rear seat and pop the lid off the access to the fuel pump and it gets a louder that would give you an answer...
If it is actually constant with speed and kicks in at 25MPH, I would be tempted to guess groaning fuel pump... I am fresh from 5 days of driving a loaner (wife's car being repaired - not the mustangs), with such a thing, so I am sensitive to this one...
If it increases with turns and or it varies with speed, then clutch pack (TSBs on that) or possibly ventrilaquist power steering pump... Either of those WILL vary with speed though, so my"final answer" (er random out of the air guess) is fuel pump...
If you pull out your rear seat and pop the lid off the access to the fuel pump and it gets a louder that would give you an answer...
#5
RE: Please help me diagnose this noise...
Initially I thought it was the heat shields, and it may be as the bolts holding them on aren't placed very well. While I was beneath the car, I tightened everything I could, but everything seemed to be snug. I tried pulling, shaking, and pushing on everything that came to mind. The heat shield was the only thing to "rattle" when I tapped it. I did a few small alterations on it "Just bending it slightly. -- Not to the point where you can see it bend, though -- and then tapped it and it was a solid sound, so I figured the problem was fixed. Wrong.
Mike
PS. Sorry for the answer hijack as well.....
#6
RE: Please help me diagnose this noise...
ORIGINAL: Menace
A rattle undernearth the car, beneath the shifter/console as a rough estimate. When I accelerate going up a slight hill it sounds like thin metal just vibrating like crazy against something.
A rattle undernearth the car, beneath the shifter/console as a rough estimate. When I accelerate going up a slight hill it sounds like thin metal just vibrating like crazy against something.
#7
RE: Please help me diagnose this noise...
ORIGINAL: richmod
never heard of a groaning fuel pump. I'll try anything at this point.
never heard of a groaning fuel pump. I'll try anything at this point.
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