Engine buzz under load?

[Yury]

Since I am relatively new to Yaris and don't always know what's normal and what's not...
Whenever I accelerate, somewhere around 2000 rpm my engine sound changes. It gets this buzzy component to it. It's steady and is not a rattle or clank or tap-tap, just a steady buzz.
If I just rev up while standing the engine sound remains a consistent purr.

The car is 3 years old but very low mileage - 25000 km (~15000 miles).

Normal?

Thanks.

[A-Dingo-Ate-My-Baby]

is it a hissing ?
a whining ?
a purring ?
a scraping ?
a squealing ?
a muffled whine/purr/scrape/buzz/squeal ?
a gear noise ?
a creak ?
a "nya, nya" ?
a "ohm, ohm, nya, nya"
or "who, whu, wuuu, wuuu" (Bubb Rubb)


Here are all the possible sounds:

Bad Bearing in Timing Belt Tensioner: woh woh woh woh
Boiling Coolant: bllgh blllgggh blllllgggghh
Brake Booster Failing: hissssssssss ssss ss
Clutch Release Bearing on the Way Out: jee je je jeee
Clutch Screech: screek, screek, screek
Connecting Rod that went through the Engine Block: clicketta clicketta clicketta
Dieseling: blubBLUBblubBLUB
Engine Knock: tuckaTHUCKtuckaTHUCKtucka
Engine Reving Up and Down: vooRRRR, vooRRR, vooRRR
Fly Wheel: gurrEENK, gurrEENK, gurrENK
Loose Belt: YEEeeEEeeEEeeEEeeEEee!
Low Coolant: bwwob bwwwobbubwub
Misfire: puhVRooPuhHoo puhVROOpuhHOO
Sticky Lifters: dicka, dicka, dicka, dicka
Water Pump: grrgula, grrgul,grrgula, vum wum wum wum wum
Weak Battery: wurrrrRRRRrrrrwuRRRrrr
Wiper Transmission Sound: eee eee eeee eeee
Vacuum Leak: vwishhhhhhhhhhhhhhhhhh

[Yury]

I'd say a constant muffled buzz. If I had the radio on at a reasonable level I would not notice it.
none of your sounds match really.

[Altitude]

Maybe it's air wooshing past the throttle plate.

[Kaykogi]

Originally Posted by A-Dingo-Ate-My-Baby

is it a hissing ?
a whining ?
a purring ?
a scraping ?
a squealing ?
a muffled whine/purr/scrape/buzz/squeal ?
a gear noise ?
a creak ?
a "nya, nya" ?
a "ohm, ohm, nya, nya"
or "who, whu, wuuu, wuuu" (Bubb Rubb)


Here are all the possible sounds:

Bad Bearing in Timing Belt Tensioner: woh woh woh woh
Boiling Coolant: bllgh blllgggh blllllgggghh
Brake Booster Failing: hissssssssss ssss ss
Clutch Release Bearing on the Way Out: jee je je jeee
Clutch Screech: screek, screek, screek
Connecting Rod that went through the Engine Block: clicketta clicketta clicketta
Dieseling: blubBLUBblubBLUB
Engine Knock: tuckaTHUCKtuckaTHUCKtucka
Engine Reving Up and Down: vooRRRR, vooRRR, vooRRR
Fly Wheel: gurrEENK, gurrEENK, gurrENK
Loose Belt: YEEeeEEeeEEeeEEeeEEee!
Low Coolant: bwwob bwwwobbubwub
Misfire: puhVRooPuhHoo puhVROOpuhHOO
Sticky Lifters: dicka, dicka, dicka, dicka
Water Pump: grrgula, grrgul,grrgula, vum wum wum wum wum
Weak Battery: wurrrrRRRRrrrrwuRRRrrr
Wiper Transmission Sound: eee eee eeee eeee
Vacuum Leak: vwishhhhhhhhhhhhhhhhhh

This is the best thing I have ever seen in my life.

[Kaykogi]

Originally Posted by A-Dingo-Ate-My-Baby

"who, whu, wuuu, wuuu" (Bubb Rubb)

Especially this one.

[Yury]

another thing that comes to mind is leafs rustling. but steady, no variation to it.

[Yury]

Just test drove a colleague's Echo. Found the same sound. It was less prominent but it was there. Her Echo sounds a little quieter altogether maybe that's why there was it was less.

Anyhow, I will chalk it up as normal for this engine.

[josh044]

I have the same thing on mine. I've never owned a car with a timing chain, and I don't think you're supposed to hear a timing chain, but this is how I'd describe it. It's what I think timing chain noise would sound like.

[Yury]

Originally Posted by josh044

I have the same thing on mine. I've never owned a car with a timing chain, and I don't think you're supposed to hear a timing chain, but this is how I'd describe it. It's what I think timing chain noise would sound like.

i've been thinking the same thing exactly.

[CoryM]

The timing chain on my car is audible as well. It's a whirring noise that gets faster as engine rpm goes up. It sounds a lot like the whine of an alternator charging hard if you have ever heard that.

Cheers.
Cory

[Yury]

Originally Posted by CoryM

The timing chain on my car is audible as well. It's a whirring noise that gets faster as engine rpm goes up. It sounds a lot like the whine of an alternator charging hard if you have ever heard that.

Cheers.
Cory

like in this video http://www.youtube.com/watch?v=FGGoHOjeVn4 starting аt sec 8? that sounds similar to my engine :)

[CoryM]

No. Chains sound like this maxima. You can hear it most as the engine rpm is coming down after the throttle snap. A whine.

http://www.youtube.com/watch?v=paPZ-...eature=related

In his case the plastic the chain rubs against is worn or broken off the tensioner and is now on the metal so is louder than normal. Our yarii chains are a little noisy but seems normal.
Cheers.

[Yury]

Originally Posted by CoryM

No. Chains sound like this maxima. You can hear it most as the engine rpm is coming down after the throttle snap. A whine.

http://www.youtube.com/watch?v=paPZ-...eature=related

In his case the plastic the chain rubs against is worn or broken off the tensioner and is now on the metal so is louder than normal. Our yarii chains are a little noisy but seems normal.
Cheers.

so what am I hearing then...mine sounds much like in the link I posted, except that I have to be accelerating, not just revving.

EDIT: although I must say that the noises in these 2 videos are not that far apart tone wise, esp accounting for the variations of the recording equipment/environment

[Yury]

Dropped by a dealer this morning. They tightened up exhaust heat shields, but that didn't make much difference.
Also showed it to my mechanic. He pronounced it normal, and said that what I am hearing is a sound of the air intake. I drove around this this in my head and I agree that this sound may be described as air rushing in through a small opening. Psychology is a funny thing :)
He did mention that the intake design on these is 'tricky' (he said that in russian, but that's the best translation)

[TOLMACH]

Originally Posted by Yury

Dropped by a dealer this morning. They tightened up exhaust heat shields, but that didn't make much difference.
Also showed it to my mechanic. He pronounced it normal, and said that what I am hearing is a sound of the air intake. I drove around this this in my head and I agree that this sound may be described as air rushing in through a small opening. Psychology is a funny thing :)
He did mention that the intake design on these is 'tricky' (he said that in russian, but that's the best translation)

Yuriy,

I have the same sound.

What exactly did mechanic say about the intake? (I speak some Russian)

Pavel

[Yury]

Pavel,

He said "это нормально, я пытался разобраться и там интейк хитрый." Which is pretty close to my english translation :)
He said that 1.8 engines had the sound as well.

The more I drive it the more I hear this as whooshing air.
Also, look at the shape of the throttle body gasket:



I can totally see this mesh at the bottom making interesting noises and kinda concur with my mechanic.

[TOLMACH]

Thanks ))

I have a 2 yo car with circa 40k on the odomoter and hear this strange sound as well. I am glad I found this thread cause my mechanical skills do not go beyond installing car speakers.