Chassis droning question

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Old 14 Nov 2005, 05:56 pm   #1 (permalink)
mechosu@hotmail.com
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Default Chassis droning question

I wanted to throw this one out there and see what others think. I
have a FWD 4cyl camry which when the accelerator is pressed, it makes
a droning sound inside the cabin (i.e. a low frequency constant
vibration of the chassis often associated with bad tires). When you
let off the throttle, the droning goes away. Hit the throttle and it
comes back. Secondly, when I come to a stop at a traffic light,
sometimes I get a faint jerk. I don't know if is the engine or the
transmission, but I occassionally feel the slightest jerk (most
passengers would never notice it, even if I stated right afterwards
"did you feel that?"). Lastly, if I have the vehicle in neutral, and
I turn on the A/C, the car will vibrate a bit. My current thoughts
are that this has to be the rear engine mount. Why the rear...because
I already replaced the front. It actually made it worse, which makes
me think that the new one is fighting the older worn out one.
Therefore, as the throttle is pressed, the engine will be torqued onto
the rear engine mount. I plan to rotate the tires here shortly, to
see if it moves to the back. However chassis vibration is very
difficult to determine, since it manifests itself throughout the
vehicle. Am I wasting my time with the mount or is there any other
components that might exhibit this symptom?
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Old 14 Nov 2005, 07:36 pm   #2 (permalink)
m Ransley
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Default Re: Chassis droning question

It could be a few things, motor mount , differential, did you ever
check its oil? CV joint, bad belts, there are many more things that can
make noise

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Old 14 Nov 2005, 08:25 pm   #3 (permalink)
mechosu@hotmail.com
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Default Re: Chassis droning question

The thing that I was getting out was that the noise only occurs with
the throttle pressed, not while coasting or braking. The car vibrates
in nuetral only with the A/C on, so I highly doubt any transmission
related issues and the oil was changed over the weekend. I suspected
the CV joints, but these were replaced less than a year ago and the
boots are in great condition and they have plenty of grease. In fact,
I have driven the car near a wall and you can usually hear all sorts
of rotational related noises due to the sound waves reflecting off of
the wall. The car sounds great externally, but it is mostly internal
cabin noise related to the chassis picking up vibration. I am not
questioning, but I am looking for logical alternatives to help me do
some more investigation before I tackle this project. I don't really
know much about the history of the car, much more than about 2 years
ago.

On Mon, 14 Nov 2005 19:36:49 -0600, ransley@webtv.net (m Ransley)
wrote:

> It could be a few things, motor mount , differential, did you ever
>check its oil? CV joint, bad belts, there are many more things that can
>make noise

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Old 14 Nov 2005, 08:50 pm   #4 (permalink)
Jason James
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Default Re: Chassis droning question


<mechosu@hotmail.com> wrote in message
news98in15dfopfiidnfrdkpv3s1ncql503l9@4ax.com...

I have always noticed a soft droning noise (its barely audible ) associated
with a slight vibration as well thru the whole car at speeds less than
50mph, and most noticeable at about 40 mph. I have done 20,000 ks in this
'96 model (manual) and have always done the appropriate manitenance ie g/box
oil replaced, diff, cam-belt etc. The engine doesnt look like its running at
idle its so smooth,..but the droning is there on throttle on. On power-off,
the droning drops to almost nothing. Tyres are OK. The noise didnt change
when I had new tyres on the front and the old front to the rear.

I can only put it down to some resonance thing,..maybe in the
exhaust,...assuming its the same thing you have. The CVs are OK as well.

Jason


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Old 14 Nov 2005, 09:23 pm   #5 (permalink)
Merritt Mullen
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Default Re: Chassis droning question

In article <o98in15dfopfiidnfrdkpv3s1ncql503l9@4ax.com>,
mechosu@hotmail.com wrote:

> I wanted to throw this one out there and see what others think. I
> have a FWD 4cyl camry which when the accelerator is pressed, it makes
> a droning sound inside the cabin (i.e. a low frequency constant
> vibration of the chassis often associated with bad tires). When you
> let off the throttle, the droning goes away. Hit the throttle and it
> comes back.


Sounds very similar to what I am experiencing on my 2000 Avalon with
72,000 miles. Except I would describe the sound as similar to an electric
motor winding up. It is most distinct between 30-40 mph and is related to
car speed, not engine speed. Just like you it is apparent when
accelerating (pressing the accelerator), but goes away when take your foot
off the gas. I suspect front wheel bearings, and I plan to take it to the
dealership for diagnosis.

My old 87 Camry with 135,000 miles also did that, but I just attributed it
to old age in that case. I don't think a 72,000 mile Avalon should make
that sound.

Merritt
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Old 15 Nov 2005, 08:37 am   #6 (permalink)
Daniel
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Default Re: Chassis droning question

Not sure if this is the same as your condition, but I was getting a
hydraulic droning sound under acceleration which I attributed to the
transmission.
Now when I drain the fluid I use Mobil 1 synthetic ATF with 8 oz. of
Lucas transmission fix and I haven't heard that sound for years.
Lucas contains no solvents or particulate additives and can be
considered a maintenance product for new units also.
Obviously just my opinion.

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Old 15 Nov 2005, 06:57 pm   #7 (permalink)
Rob
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Default Re: Chassis droning question

I would look at the mount on top of the engine too. I had a droning
problem that drove me nuts until I found it. With the hood up stand
next to the drivers side and have someone put it in gear, AC on,
holding the foot brake, then have them push the gas pedal. You should
be able to find it. Oh my problem was the air filter box!
I had to remove it and put a thick sponge under it and retighten it.
A simple fix, hope yours is too.

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Old 15 Nov 2005, 10:35 pm   #8 (permalink)
Hachiroku
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Default Re: Chassis droning question

On Mon, 14 Nov 2005 18:56:27 -0500, mechosu wrote:

> I wanted to throw this one out there and see what others think. I
> have a FWD 4cyl camry which when the accelerator is pressed, it makes
> a droning sound inside the cabin (i.e. a low frequency constant
> vibration of the chassis often associated with bad tires). When you
> let off the throttle, the droning goes away. Hit the throttle and it
> comes back. Secondly, when I come to a stop at a traffic light,
> sometimes I get a faint jerk. I don't know if is the engine or the
> transmission, but I occassionally feel the slightest jerk (most
> passengers would never notice it, even if I stated right afterwards
> "did you feel that?"). Lastly, if I have the vehicle in neutral, and
> I turn on the A/C, the car will vibrate a bit. My current thoughts
> are that this has to be the rear engine mount. Why the rear...because
> I already replaced the front. It actually made it worse, which makes
> me think that the new one is fighting the older worn out one.
> Therefore, as the throttle is pressed, the engine will be torqued onto
> the rear engine mount. I plan to rotate the tires here shortly, to
> see if it moves to the back. However chassis vibration is very
> difficult to determine, since it manifests itself throughout the
> vehicle. Am I wasting my time with the mount or is there any other
> components that might exhibit this symptom?


Have you checked the exhaust? I had the same thing in a Supra, couldn't
find anything until I found a Quarter sized hole in the exhaust system.

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Old 16 Nov 2005, 05:21 pm   #9 (permalink)
mechosu@hotmail.com
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Default Re: Chassis droning question

Good point about the exhaust. It is easy enough to check by having
somebody rev the engine up while listening for leaks. I will have to
try this when it warms up a bit. The flexible bellows with the steel
overbraid shows some signs of wear, but it wouldn't explain the
vibration when parked with the A/C on. I still think it is a mount,
though. I put the automatic shift selector into drive and then switch
to reverse and you can feel and see the engine rock back, so I am
sold. It isn't too bad when I first get in and start the engine up,
but when it has been driven for a while, you can really feel it. I
just noticed this today, when I backed into a parking spot. I
replaced the dog bone and front mount and the tranny mount is solid
rubber that has no signs of cracks or fatigue. The rear mount is one
of the last links, which exception to the drive train, axles, and
struts. The previous caretaker replaced the struts about two years
ago so solve that inadequate cushioning in the shock tower (waste of
money) and the CV joints are pretty new also. I will post an update,
when I have an answer.

On Wed, 16 Nov 2005 04:35:39 GMT, Hachiroku <Trueno@ae86.GTS> wrote:

>On Mon, 14 Nov 2005 18:56:27 -0500, mechosu wrote:
>
>> I wanted to throw this one out there and see what others think. I
>> have a FWD 4cyl camry which when the accelerator is pressed, it makes
>> a droning sound inside the cabin (i.e. a low frequency constant
>> vibration of the chassis often associated with bad tires). When you
>> let off the throttle, the droning goes away. Hit the throttle and it
>> comes back. Secondly, when I come to a stop at a traffic light,
>> sometimes I get a faint jerk. I don't know if is the engine or the
>> transmission, but I occassionally feel the slightest jerk (most
>> passengers would never notice it, even if I stated right afterwards
>> "did you feel that?"). Lastly, if I have the vehicle in neutral, and
>> I turn on the A/C, the car will vibrate a bit. My current thoughts
>> are that this has to be the rear engine mount. Why the rear...because
>> I already replaced the front. It actually made it worse, which makes
>> me think that the new one is fighting the older worn out one.
>> Therefore, as the throttle is pressed, the engine will be torqued onto
>> the rear engine mount. I plan to rotate the tires here shortly, to
>> see if it moves to the back. However chassis vibration is very
>> difficult to determine, since it manifests itself throughout the
>> vehicle. Am I wasting my time with the mount or is there any other
>> components that might exhibit this symptom?

>
>Have you checked the exhaust? I had the same thing in a Supra, couldn't
>find anything until I found a Quarter sized hole in the exhaust system.

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Old 16 Nov 2005, 07:35 pm   #10 (permalink)
Justa Lurker
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Default Re: Chassis droning question

95 and 99 Camry LE, both 4 cyl auto & approx 100000 miles. Oil changes
every 3000 miles.

I have experienced the "droning" sound myself on several occasions,
clearly audible when sitting in the driver seat.

Seemed to be coming from right side of car.

Stopped when my mother-in-law opened the passenger side door and got out.
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