Super strange Transmission noise

[virgilio992]

Hello Folk! Sorry to bother you, but i'm experiencing a super-strange problem with my late 2010 Toyota Yaris 1KR-FE with 5 gears manual (yep, i'm european).
It's super hard to explain, that's why i will upload a video ASAP if requested. That's what's happening: when i reach an high number of revs (over 3500-4000 rpm) i hear a strange "cartoony" noise that disappears all by itself ( around 3-5s). Sometimes i hear it when i change gear but, most of the time, it's on the high revs. It doesn't happen all the times, but it's worrying! Personally i suspect a gearbox\transmission issue. My Toyota has 54 000 km (about 37 000 miles), it happens with ALL the gears except the 4th and 5th. I have NO problem inserting the gears, it's all fluid as usual. The problem started around december when i changed my brake fluid, coul be related? Hope you will help me sorting this out,

Andrew

[virgilio992]

https://www.youtube.com/watch?v=eo94ID3kKnI
here's the video, you can hear it (it's not quite easy unfortunately) between 0:09 and 0:11.. it sounds like this https://www.youtube.com/watch?v=fan15rky1pg
please guys help me, i'm going nuts!!! :frown:

[CTScott]

It does sound odd. Are you sure it is the transmission and not the exhaust that is making the noise?

[virgilio992]

mmmh i've never thought about it! How can i verify if it's my exhaust? It isn't a rattling sound by the way.....

[CTScott]

mmmh i've never thought about it! How can i verify if it's my exhaust? It isn't a rattling sound by the way.....

Rev the engine in neutral to see if you still hear the noise.

[virgilio992]

it doesn't :frown: i noticed that i can hear the noise after a 20-30 mins driving :iono: it's hard to hear it before that amount of time! PS: can't go to a toyota dealership, it's more than an 100 miles away!

[CTScott]

it doesn't :frown: i noticed that i can hear the noise after a 20-30 mins driving :iono: it's hard to hear it before that amount of time! PS: can't go to a toyota dealership, it's more than an 100 miles away!

It might not happen until it heats up. Once you start hearing the sound, then try the revving in neutral.

[virgilio992]

i'll try tomorrow morning! (GMT +1 ! ) if it does the noise revving in neutral, what could be the solution? :\

[CTScott]

i'll try tomorrow morning! (GMT +1 ! ) if it does the noise revving in neutral, what could be the solution? :\

If it does it in neutral it could be a crack in the manifold or bad gasket between the manifold and exhaust.

[virgilio992]

Ok i checked out and it DOES the noise revving in neutral! What can i do to fix this out? At least i think we can exclude a gearbox problem!

[CTScott]

Ok i checked out and it DOES the noise revving in neutral! What can i do to fix this out? At least i think we can exclude a gearbox problem!

That's good that it is not the gearbox. It is likely exhaust related, so now it is a matter of figuring out where it leaks when hot. You can try shining a light while someone else revs the car (once it is hot) or you can bring it to a shop where they can put it up on a lift to look from under.

[virgilio992]

Thank you so much! I will try to shine a light with the help of a buddy of mine... unfortunately in italy it costs 50$ just to lift up your car..... :thumbdown: i hope that the it would be cheap to solve it out :bow:

[CTScott]

Thank you so much! I will try to shine a light with the help of a buddy of mine... unfortunately in italy it costs 50$ just to lift up your car..... :thumbdown: i hope that the it would be cheap to solve it out :bow:

If your remove the aluminum heat shield from the exhaust manifold you will be able so see better.

Out of curiosity, in what part of Italy are you located?

[virgilio992]

I'll see ASAP! :biggrin:
i'm actually here:
http://s18.postimg.org/5cjb4dked/pianta_italia_regione.jpg (http://postimg.org/image/5cjb4dked/)

[CTScott]

I'll see ASAP! :biggrin:
i'm actually here:
http://s18.postimg.org/5cjb4dked/pianta_italia_regione.jpg (http://postimg.org/image/5cjb4dked/)

Ah, very good. I have never been that far south on the eastern side of Italy, except passing by there on a cruise ship.

[virgilio992]

you should, the place is beautiful except for people's bad actitude