Audi A4 2.5 TDI 150km Turbine Control: Upper Position Issue, Flow Meter, Boost Sensor, Zero Errors

Hello. Listen, I have such a problem with my A4, namely that the turbine bar is still in the upper position. I connected to the computer with zero errors, replaced the flow meter, boost sensor, turbine and nothing, the problem is still there. I am asking you for help.

You did not enter the year and engine code.

damek115 wrote:

I connected to the computer with zero errors

If the bar is standing there will be a problem with the top-up, which will be automatically registered by the driver as an error.

damek115 wrote:

I replaced the flow meter, boost sensor, turbine and nothing problem exists.

Anything you checked before replacing? Vacuum, wires ...?

Yes, I start the car and the bar rises immediately, connecting the wires is ok, when I disconnect the power from the solenoid valve, it lowers.

Added after 3 [minutes]:

I do not remember the year of the car, engine code 98. The barbell is working, the vacuum pump is ok too.

Hi

Everything fine.

You're looking for a hole in the whole ...

damek115 wrote:

Yes, I start the car and the bar rises immediately, connecting the wires is ok, when I disconnect the power from the solenoid valve, it lowers.

So what's the problem? If you would like to see the barbell work so much, take someone, let him talk to you and watch.

damek115 wrote:

I changed the flow meter, boost sensor, turbine and nothing problem still exists

Hard to believe ...

mario77 listen to your opinion there is no problem since the car is idling and the turbine is pushing the pressure on it.

Added after 4 [minutes]:

Ttomek, if it were correct, I wouldn't be looking for a problem. I know how it worked before and how the car ran

damek115 wrote:

listen in your opinion, there is no problem if the car is idling and the turbine is pushing it with pressure

Listen, I would suggest you read up on how the turbine and wastegate work.

damek115 wrote:

anyway, I wouldn't look for a problem, I know how it worked before and how the car ran

So how did it work before and how did the car work? What's wrong now?
As you stated yourself at the beginning, there are no mistakes. You can easily view the current boost pressure and compare it with the set one plus any logs.

You posted a photo ok, it's cool, now see how the bar is set, if it is raised to the maximum, all exhaust gases go to the rotor and when lowered, it collapses partially into the exhaust. And in my case, the barbell all the time up and down will not even move, although I would ask for a glaskal and nothing until the car is turned off or disconnected from the electric valve, it will drop.

Added after 7 [minutes]:

Previously, this bar at idle was in the lower position after screwing the engine to 2500 rpm it was in the upper position and after 3000 rpm above it fell down and released the pressure in the exhaust system, and now it is not, the pressure is released through the air filter.

Connect the car to the computer, enter block 11 where you can see the boost pressure, set pressure and N75 control and you will see how it should be.
You can also check the boost pressure sensor if it is cheating you.
The barbell is to be pulled out at idle speed.
The turbines drive the exhaust gases.
The boost pressure is regulated by adjusting the vacuum applied to the bulb. As the engine speed increases, the exhaust gas flow velocity increases, which makes the turbine spin faster.
At idle, the exhaust gas speed is too low, so the EDC will drive the N75 almost to the maximum and then the bar deflects to the maximum. If the turbine reaches the set pressure, the EDC closes N75.
As the revs increase, the speed of the turbine increases. This increases the boost and EDC limits the opening of the N75 so that the turbine does not spin too fast, because it exceeds the set pressure.
Make a dynamic log 11 and you can start measuring it even from the start of the car and there you will see if it is ok.
The bar is to be lifted at the stop.
If the bar was lifted throughout the entire range of revolutions, you would have a saved error about reloading.

And what is the pressure at idle?

Around atmospheric.

Such as EDC wants and it can be seen in the measuring blocks.
You have the set and current pressure displayed there.
Make logos of dynamic block 11 from the moment the car is started to its acceleration in 3rd gear to the end, you will see how it works.
The exhaust gas speed is too slow at low revs to accelerate the compressor so that it starts pumping what the controller wants.