2001 Corolla Engine Noise

My 2001 corolla has 72K miles on it. Recently I ham hearing some
unusual noise. After every stop, when I hit the gas pedal I hear the
noise. I gets louder with the Air Conditioner on. Anybody has any
thoughts what the problem might be? How to fix it?

On May 11, 11:44 am, zkhond... (AT) gmail (DOT) com wrote:

My 2001 corolla has 72K miles on it. Recently I ham hearing some
unusual noise. After every stop, when I hit the gas pedal I hear the
noise. I gets louder with the Air Conditioner on. Anybody has any
thoughts what the problem might be? How to fix it?

I'm no expert... Ray O is the expert. I recently had some noise when
idle and more when I accelerated. It ended up being I needed the
serpentine belt replaced as well as the tensioner. Sound went away.
Hopefully Ray O has some good advice for you. :-)

What kind of noise is it?

Since you stated that the noise changes if the A/C is on or off, maybe you
should be looking at the belts.




<zkhondker (AT) gmail (DOT) com> wrote

My 2001 corolla has 72K miles on it. Recently I ham hearing some
unusual noise. After every stop, when I hit the gas pedal I hear the
noise. I gets louder with the Air Conditioner on. Anybody has any
thoughts what the problem might be? How to fix it?

<zkhondker (AT) gmail (DOT) com> wrote

My 2001 corolla has 72K miles on it. Recently I ham hearing some
unusual noise. After every stop, when I hit the gas pedal I hear the
noise. I gets louder with the Air Conditioner on. Anybody has any
thoughts what the problem might be? How to fix it?

Noises are very difficult to diagnose without hearing them first hand,
especially without a description of the noise, a description of the
frequency, amplitude, duration, where the noise is coming from, etc.

Is the sound a rattle, squeal, clunk, clatter, buzz, squeak, whine? If it
is a whine, leave the kids and mother-in-law at home. (just kidding)


--

Ray O
(correct punctuation to reply)

On 11 May 2007 11:44:21 -0700, zkhondker (AT) gmail (DOT) com wrote:

My 2001 corolla has 72K miles on it. Recently I ham hearing some
unusual noise. After every stop, when I hit the gas pedal I hear the
noise. I gets louder with the Air Conditioner on. Anybody has any
thoughts what the problem might be? How to fix it?

Hmmm - gets louder with the AC on...

You really can't diagnose odd sounds over the net, but if you have a
"mechanic's stethoscope" you may be able to isolate it down - it looks
like a doctors stethoscope from the ears down to the Y point, but it
has a mechanical pickup and a metal probe sticking out. You touch the
probe to the suspected bad accessory or pulley, and if there are any
mechanical noises like a bad bearing rumble or moan, you'll hear them.

My first thought would be to check the AC clutch pulley bearings
carefully for wear and end-play, since the loading and thrust vectors
change when the AC is on.

The pulley turns on a ball bearing that rides on an enlarged "nose"
of the compressor body front housings, then the magnet coil hidden
under the pulley attracts the flex plate with the clutch facing, the
flex-plate pulls in and spins the compressor input shaft - it's a
marvel of packaging.

--<< Bruce >>--

Is the sound a rattle, squeal, clunk, clatter, buzz, squeak, whine?

It starts with a buzz and sometimes changes to a rattle. Thanks.

ZK

<zkhondker (AT) gmail (DOT) com> wrote

Is the sound a rattle, squeal, clunk, clatter, buzz, squeak, whine?

It starts with a buzz and sometimes changes to a rattle. Thanks.

ZK

To refresh everyone's memory, especially mine, here are the original post
and my response:
**********

My 2001 corolla has 72K miles on it. Recently I ham hearing some
unusual noise. After every stop, when I hit the gas pedal I hear the
noise. I gets louder with the Air Conditioner on. Anybody has any
thoughts what the problem might be? How to fix it?

Noises are very difficult to diagnose without hearing them first hand,
especially without a description of the noise, a description of the
frequency, amplitude, duration, where the noise is coming from, etc.

Is the sound a rattle, squeal, clunk, clatter, buzz, squeak, whine? If it
is a whine, leave the kids and mother-in-law at home. (just kidding)
***********

Where is the buzz or rattle coming from? Is it from the dashboard, under
the car, engine compartment, back of the car?

Doe the buzz or rattle happen as soon as you start the car or does it have
to warm up a bit?

--

Ray O
(correct punctuation to reply)

Response to Ray O:

The buzz comes from the engine compartment. Its more pronounced when
the car has not warmed up. In the morning when I change gear from P to
R/D the buzz starts (no buzz at P or N). It gets louder when I hit the
gas pedal, I don't hear it after 1 or 2 seconds. It keeps doing this
every time I hit the gas pedal after a stop. As I said earlier it is
louder (sometimes like a rattle) with the A/C on . I am thinking it
might be a loose belt, but not sure. Since it does it only on driving
gear I couldn't check the exact location, but it is from under the
hood. Thanks.

ZK

On May 18, 8:01 am, zkhond... (AT) gmail (DOT) com wrote:

Response to Ray O:

The buzz comes from the engine compartment. Its more pronounced when
the car has not warmed up. In the morning when I change gear from P to
R/D the buzz starts (no buzz at P or N). It gets louder when I hit the
gas pedal, I don't hear it after 1 or 2 seconds. It keeps doing this
every time I hit the gas pedal after a stop. As I said earlier it is
louder (sometimes like a rattle) with the A/C on . I am thinking it
might be a loose belt, but not sure. Since it does it only on driving
gear I couldn't check the exact location, but it is from under the
hood. Thanks.

ZK

I still stand by loose belt or bad pully.

<zkhondker (AT) gmail (DOT) com> wrote

Response to Ray O:

The buzz comes from the engine compartment. Its more pronounced when
the car has not warmed up. In the morning when I change gear from P to
R/D the buzz starts (no buzz at P or N). It gets louder when I hit the
gas pedal, I don't hear it after 1 or 2 seconds. It keeps doing this
every time I hit the gas pedal after a stop. As I said earlier it is
louder (sometimes like a rattle) with the A/C on . I am thinking it
might be a loose belt, but not sure. Since it does it only on driving
gear I couldn't check the exact location, but it is from under the
hood. Thanks.

ZK

Check:
Make sure there are no unsecured wire harnesses or electrical connectors in
the engine compartment
Make sure the heat shield over the exhaust manifold is not buzzing
Check the clip that holds the hood prop rod down
Some Corollas make normal valvetrain noise. Check the oil level.
Check the accessory drive belt pulleys
Check any heat shields over the exhaust system
--

Ray O
(correct punctuation to reply)