[Solved] VW passat B6 2.0 tdi - jerking above 1800 rpm, no power and error p0299

Hi everyone,

There are many similar topics, but I have not found one that specifically matches my symptoms.

Namely, when accelerating above 1800 rpm, the car loses power and starts to jerk that it is impossible to drive.

Even at a standstill, when I try to gasp, you can feel these uneven revolutions and with the gas pedal fully depressed, the revolutions do not exceed 2500.

In addition, after connecting to the computer, error p0299, i.e. too low boost pressure, and in fact when pressing the gas pedal to the floor, it should be 2.5 bar, and the pressure does not exceed 1.5 bar.

The turbine bar works in full range, which means that the pear and the stuck vanes fall off. But in my opinion, if they were toasted, it would be rather overloading. Yes?

I changed the N75 valve from another car and you can't see any difference.

The cables are also rather inspected and there is no hole anywhere.

The pipe does not smoke because there is DPF, and it should not. Right?

DPF checked with the computer and also does not indicate that there is something wrong with it.

The injectors also work correctly according to the computer.

Does this mean that the turbine is dead? And if the turbine, what could have fallen there that I have such symptoms? Can he check anything else? What do you advise?

I removed the turbine inlet pipe and the impeller has no noticeable play and turns slightly.

At a standstill, you will not turn more than 2500 rpm because the computer cuts off, and the second - how did you check the boost pressure? Probably at a standstill, and this is a mistake, because then the real pressure will never come out, you have to drive preferably in 3rd gear and with gas in the floor you watch the situation develop. From the top-up, also subtract the bar, because remember that the sensor at a standstill shows about 1 bar - atmospheric pressure, so the top-up will temporarily be 1.5 bar, usually it fluctuates around 1.0-1.2 bar,

I checked while driving, the pedal in the floor and jerking above 1800 rpm, and the pressure fluctuates around 1.5 bar and immediately goes into emergency mode
and how to check the intercooler?

If you have 1.5 bar in the program, the actual boost is at 0.5 bar. Check the turbo-intercooler connections, check if it is not flooded with oil, or unbuttoned it, and if it does not whistle when gassing at a standstill. Also check the EGR valve if it is tight and the catalyst is not clogged. Check if the turbo control system is tight (pear and hose). If all this is operational, then suspect a turbocharger.

And the engine develops full speed at all? Because this jerking and lack of smoke would indicate a lack of fuel rather than air.

the wires, as I checked organoleptically, should be tight, but I do not like this jerking, because it is rather if there was a leak, it would be a lack of power and that's it, note.
probably the most sensible now would be to check the unit injectors, although at the first check the correction was close to 0, so hence the conclusion that they are OK, unless you have to check otherwise?

And if the turbine is screwed up and there is DPF, there will be smoking, will DPF not allow it, because it still puzzles me?

Does he pull the barbell on the turbine at the Stop at all? Did you check it? And dpf is not a magic creation, just an ordinary filter that collects I guess. If it is dry and cold, it will let out smoke when the turbine collapses. If it is clogged, nothing will be missed and you should look for a problem here. You can unscrew it at the turbo or skip it and try how the car drives.

When I stop, the barbell goes up and down in the range of ~ 1cm.
Komp shows that the DPF was burned out some 40 km ago and its filling value is 38%.
I'll try to unscrew it again then.
And how can egr be associated with these symptoms?

A leaky EGR valve will cause you to leak air under pressure into the exhaust and there will be no boost.

I cleaned the EGR and throttle, but it didn't change anything.
I was so wondering about this DPF, it looks like it's jammed heavily

From what I read, the maximum amount of ash is 60g, here it shows me 105.

And if I disconnect the DPF from the turbine, nothing will happen except that it will work louder?

Nothing will happen.

Clogged DPF for cleaning