[Solved] Corolla E12 1.6 2002. - vibrations on the floor and engine hum

Good evening, I wanted to present the problem because neither I nor my mechanic can handle it. It is a Toyota Corolla e12 1.6 110km car and driving at a rotational speed of 3.5 thousand (in fifth gear about 120 km / h), in this range it is impossible to drive the engine hums and there are vibrations on the floor, you have to drive either slower or faster. The mechanic looked at the exhaust system, engine cushions and claims that everything is ok. Anyone with a problem how to solve it?

And the catalyst is there?

A part vibrates and transfers it to the floor, just as if the wheels are unbalanced at a certain speed, the vibrations are transferred to the steering wheel. It could be a broken bearing or cushions under the engine, or whether the effect occurs when the engine is stationary at this speed.

The catalyst is there. After today's tests, engine hum and vibration on the floor occur at 3200-3300 rpm in each gear. There is no problem on idle. It is difficult to diagnose because I commute to work every day and I have no way to leave the car with a mechanic for longer. The car has no power drop. I can also exclude tires / rims because it was the same on summer ones

I have a question if you have already solved your problem because I have a similar one and I don't know what it might be

Do you have any play on the long driveshaft.
Maybe your inner joint is damaged and the driveshaft gets run out

I just checked the internal joint and it has slack and the rubber is cracked after that, I made an appointment with the mechanic after November 11 and we will see if it helps

Hi, have any of the men dealt with the problem with me it started the same? best regards

I warmly welcome. Anyone else interested in solving the problem described in the post? I am asking because I see the last post from February. I had the same and after many months I solved the problem and it was prosaic. Metal covering the fuel tank was vibrating. The front lug securing it to the chassis has broken off (actually rusted). Putting even a stick between the tank and this plate (let it not be loose) resulted in the complete silence that I had been looking for for several months and the lack of vibration. Of course, you have to add an ear in a more professional way than with a stick. I know, it seems strange because the plate is not very thick, the vibrations seem to come from the vicinity of the engine and for these reasons I did not even look for the causes of the vibrations that appeared in me at 2800-3000 in all gears when the valve timing was just changed. Let me know if I helped anyone. Best regards.

The reason was the metal sheet protecting the tank from temperature

The reason was the metal sheet protecting the tank from temperature