How a TDI engine VNT turbo works and how they fail and cause limp mode or low power

Hello. Just got my vnt cleaned on my b6 passat bkp engine with dsg because of overboosting as vnt was stuck. How can i prevent this from happening again ? I usually drive
around town. Do i need to redline it often to work the vnt vanes ? Or just regular driving is enough ?

My question is how to check the the smart actuator3 pins for resistance. .

The last part when you said it has hesitation would this cause a big judder at all? Really need help thanks in advance

Most of the time vacuum solenoid failed, and brings torbo to overheat and failed, I just bought a replacement turbo cartridge of the eBay and fix my turbo , but the problem was turbo actuator vacuum solenoid failure.

I assume these are the turbos on an ALH TDI?

How do you disassemble that type of turbo? It has no screws like the rest of them

+1 subscribe from me. Information is simple, yet clear. And the guy gets straight to the point. Lovely.

I just want to know why is my turbo making a wistel sound when I accelerate
Plz can u help me

Would this be for an 06-08 as well?

could these be the issue. my engine does this weird thing where near max load it accelerates faster when the throttle is not pushed in all the way. its not the sensor. i tested it and it read 100% when the pedal was pushed to max. i believe its either that or a faulty injector but my soot emission levels are so low that i believe the injectors are good. the intake valves would use some walnut cleaning but that doesnt really explain it

Interesting video, my vw tdi is being thrown into limp mode almost daily now because of overboost, will be taking it off soon and checking it out.

Nice vid but wish you showed how to remove turbo

Nice video! Loved how well spoken you are. I hate watching someone explain something and every other word is uhm….uhm….uhm…. thanks for the great video.

شكرا جزيلا

excelente video lo felicito

Excellent video. Really logically explained with excellent detail. Thank you.

Excellent video... great detailed explanation

Im grateful for this video
Thank you

Time to get to the dealership under deiselgate warranty. Surging, actuator cel code, and loss or power

bonjour esque la valeur de pression qui fait bouger la tige c'est la même à la sortie du turbo ? Je veut dire pression a point de début déplacement de tige =Pression de soufflement turbo?

Kolay gelsin bana transporter T5 1.9 105 HP orjinal turbosunu gönderir misin kargoyla Türkiye/Antalya adresine

I bought a new Mazda cx30 turbo, will I have to worry about this.

Hi I'm having a similar limp mode problem, except it works some times when I start it and other times not. Of the problems you explained which could be the most likely?

Perfect video. Will help me to solve half of my car problems.

Nice explanation. Now I can start diagnosing. 👍

Very good detailed video. Thanks for making it clear.

Can a sticky VNT cause high DPF pressure. I have mine cleaned and reads 40 mb to 300 on high revs & the soot goes up like crzy as revs goes up. I dont know what else to check. Thanks

TRULY USEFUL

Excellent video and easy to understand

So I’m pretty sure the exhaust blows around the outer shell and when the veins open, the flow is basically shot directly into the turbo fins to build boost fast. In the video you stated they close to build boost and open to divert around which is how a normal turbo works.

I think the most common problem is a vacuum leak.

Hoping you can help me out. I have a 2011 Audi a3 tdi and have code p0299 underboost. Audi replaced the turbo about 1000 miles ago due to failure. The car drives perfectly when the temperature is below 40f outside, but as soon as the weather gets warmer, I start getting issues. The car will take off from a stop and all of a sudden surge with a little power, then throw the glow plug light into limp mode. I've tested the boost actuator, it holds vacuum, tested the solenoid when running and it shows vacuum. I can't visually see cracks in any pipes, but am unsure of how to do a boost leak test. This car has had multiple egr and dpf issues in the past that audi has been unable to fix. Any ideas as to what I should do? I'm tired of going into limp mode on the freeway and having to shut the car off and restart.... Thank you so much for the videos!!!

Amazing video.

Amazing video

Great video, just getting started playing with VW tdi, really appreciate concise, information dense videos.

Thank you!

My wolksvagen goes on limp mode every now and then I switch of and restart the car and it works fine do you think might be this the problem?

hey, how the hell you get the VNT ring out of one of these?

How to adjust the stop screw then?

What mean limp mode ??

👍👍👍👍

Excellent explanation thank you

Didn’t mention a bad vacuum pump. No vacuum, no brakes, no boost.

The N75 boost controller solenoid is another key part of the system that you did not mention at all.

Am i right ? more vacuum means more boost ? I have install new actuator, and i get boost at approx 2000rpm, i think the boost should come approx 1600rpm, maybe i can adjust on this rod ? (No error codes)

Awesome video! Thanks for sharing this. Question about the 4 - 10mm bolts that surround the housing of the control ring... they dont seem to hold the two parts of the turbo together.. i broke off two of them by accident and was still able to open up my turbo for a well deserved clean.. but now i wonder what their function is

is there a way to clean it whitout taking it off?

Every video is about low boost. What causes too much boost. My MAP and wires are good but I get P0238

What a FANTASTIC video!!! I am dealing with a 2005 2.0L TDi Passat with weird running conditions that are being affected by the turbo. What year and engine size turbo are you working on in this video?

Mueller Port