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

See www.myturbodiesel.com/wiki/lim... for details on fixing limp mode. If the problem is carbon buildup or rust inside the turbo control ring or vanes, you can clean it out. Actuators can also be replaced for most models.

[@pag1ele]

Excellent. Clear, concise and to the point. Why can't all instructional videos be like this?

[@pradeepdhamija569]

First time I have seen that clear and well lighted with perfect sound, most of all very very good informative video. Thanks

[@KnightsTemplarChurch]

That was what I was looking for. Peace be with you. Thank you for the explanation.

[@the2120company]

lovely !! this material is simply fantastic. i just made my turbo work 2 days ahead your video. thank you!

[@scopex2749]

BRILLIANT!! I have been a Volvo man for many years and know them inside out! Just bought a cheap Transporter to build a luxury camper but the power keeps dying? So now I have to learn all about these engines! My mate is the chairman of the VW Transporter owners club and told me about this fault they all get. thank you!

[@boazkyle]

Thanks for a clear explanation without taking ages.

[@EdwinHenryBlachford]

thanks dude. very clear. to quote Albert Einstein "If you can't explain something clearly to your Grandmother, you don't understand it yourself"..

[@TriangleSquare52]

what if she has bad hearing

[@tylerguy12]

Not quite correct, but you are close enough “If you can't explain it to a six year old, you don't understand it yourself.” ― Albert Einstein

[@v6raj]

@@TriangleSquare52 shout

[@DorkyThorpy]

I haven't heard that one, very good.

[@davidneale5994]

Thank you so much. Your video was just what I have been searching for. I have an under boost on my VW Amarok BiTurbo, triggering Limp Mode. This video explains it very well.

[@ebokobena4021]

Thanks for sharing. I now understand perfectly how the VNT works. It can't be clearer than this.

[@enmiredbythelazy4401]

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

[@randallhenry188]

probably the best video I've seen on here! did not know TDI was variable pitch turbo.

[@gayletammy]

Great video. Very informative & very well done. Thanks!

[@jonathancolling2284]

Excellent Video ! Its great to get clarity with such direct and accurate information. Thanks ! :)

[@trekp1]

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

[@BMACVAGS]

nice video

[@averagesavage8195]

Just goes to show how amazing the turbo actually is good video bro

[@isacchris1]

That's awesome it reminds me of the verbal output transmission fluid pump in a 4L60E automatic transmission. Awesome video!!

[@burnercan]

Full marks, sir. Excellent information and presentation quality!

[@allanhughes7859]

Thank you so much for explaining this I have had several problems and this now makes it clear THANK YOU FOR TAKING THE TIME TO SHARE THIS

[@Maxim.Teleguz]

How did you fix the several problems

[@allanhughes7859]

@@Maxim.Teleguz I sold it !

[@MrTeknown]

Pretty nice video. I got my turbo checked after I got overboost error. It had over .8 bar boost over the demanded boost. The turbo geometry wasnt working properly, i had some oil in the compresor, but not a huge amount and the scroll was hard to move by hand, it was stuck at the first glance. I got it upgraded to gt2052v and it's a day and night different, cannot wait to get back in my car tomorrow.

[@Blake953]

This guys a genius. Makes it look way easier than it is. So how do you take the turbo out, dismantle it like that, clean it, fix / solve the limp mode problem then put it all back together? Do you run a garage, if so where are you located?

[@SimuProChannel]

Great video, explained all the things visually that i couldn't understand on text form. Thanks

[@deanmalking1987]

Exactly what i was looking for!! Thanks man

[@dalex8126]

many thanks for an informative video. Volvo I just got is the first car I've had with a VNT (& im getting turbo related fault code),it's good to know what I'm dealing with before stripping down & a video is worth a thousand words

[@streetcultureautoperforman4593]

Hi guys I am flitting a hx 40 turbo set up on a audi b6 tdi wih holset hx need some information on the set up really Will appreciate all the information thx

[@passatokc7081]

Once again, very good video and clear explanation of the subject. Thanks.

[@techdavey3486]

BE VERY CAREFUL! For instance I know someone who ended up paying a Main Dealer £3,500 to cure an intermittent Limp Home problem. Parts changed were injectors - but that didn't do it! On the next visit they changed the camshaft! (why?) but that didn't do it! The cylinder head was then changed but that didn't do it either! Next they replaced the turbo.but the vehicle was still the same. Eventually they did cure the problem but they would not say what they had done! I would guess that they replaced the injector wiring harness and its cradle because on the 110 BHP VAG 1.9 turbo-diesel these are service items. Allegedly the intense vibration can make the conductors crack inside the plastic so the wiring loom should be replaced every 30,000 miles. Not many people know that but it really is no joke when a customer ends up paying $5000 for what is basically the Main Dealer's DIY apprenticeship scheme. Take care!.

[@techdavey3486]

+Jane Gerrard A real beauty of cack-handedness was when a lady drove her VW Passat turbo diesel to the local HGV service station for some advice. "My engine is making a funny noise" she said. The HGV mechanics were all ready to dive in but the boss said hold your horses. He asked whether any work had been done on the car recently. "Oh yes" was the answer "the garage put a new cam-belt in it." Right he said. What you have got to do is take the car back and tell them to do the job properly. Its the age old problem of "Can't get the right staff anymore!" Other horror stories have been to do with Emissions particularly with petrol driven vehicles. In one case a perfectly good car was scrapped after a bozo "mechanic" swapped the catalytic converter. A great deal of money was spent for nothing as the emissions were exactly the same after the cat costing £180 ($250) had been changed. The owner of the car didn't want any more bills like that so for the car it was Game Over. At the time there was a scrappage scheme to get rid of thirsty clunkers but the new car used more fuel than the old one! With emissions faults favorites should be spark plugs, HT leads (the carbon string type really ought to be changed after two years or 30,000 miles) air filter and especially the front oxygen sensor/Lambda sensor. If the emission failure is excess oxides of nitrogen, suspect a higher than normal burn temperature. Running ever so slightly lean will do this. If the car has a MAF (Mass Air Flow sensor) that employs an electrically heated wire to measure the flow, the fault may be the odd milligram of dirt, dust, oil or pollen burnt onto the hot-wire. In England the clever solution is to use a kids paint-brush and oven cleaner. One removes the MAF then carefully paints oven cleaner onto the wire. Leave overnight. In the morning rinse the MAF wire with water then shake out any excess water. Refit to car, emissions now perfect, cost just pennies and time. Incidentally scanning the car is a waste of time and money with this fault as the ECU (computer) doesn't know! It is in fact the old Golden Rule of computers, RUBBISH IN = RUBBISH OUT. To sum up, those who are not savvy are likely to be hit with bills for all manner of spare parts which are not needed. It could even be a case of fraud if the used parts which were perfectly OK end up being sold online. Take care!

[@TheRandomActivity]

Tech Davey trust car dealers said no one ever

[@richarddale76]

Don't trust VW

[@automobileupdate4879]

U can send any turbo genuine from india $1500

[@rickydub6950]

Excellent video! Thank you for enlightening us tdi guys!

[@morosso1968]

nice and easy, loud and clear!

[@CliveHenry]

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

[@obviouslytwo4u]

awesome dude , got a stop screw problem found that out because of you , 5 star love

[@Pawliukaz]

Very good demonstration. Thanks for making this video. Thumbs up!

[@gpooleii]

Excellent descriptive video! Well done and thank you

[@DashCamsMTL]

thank you for posting this video. Mine is in limp mode but you do hear the turbo spool up. it lacks a lot of power. 250K kms.

[@ryanpillay2679]

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

[@critical_mass8279]

Nice video, thank you. Made me understand what the issue is with my Crafter turbo.

[@KG5RK]

Excellent tutorial ! Thank you

[@sandboundchris]

Very good detailed video. Thanks for making it clear.

[@user-pv2oe1bq1s]

this was an excellent explanation. I've had a new turbo installed and i still get the P2563 error. Now i believe this to be a wiring/electrical fault with the connector/loom or a fuse. The car stalls. The car was sat for a while and I noticed bedding for a mouse/rat in the engine bay. So there could even be a chewed wire.

[@SheldonMorrison17]

Did you ever figure out what was causing it? I'm getting the same error code right now.

[@servicefast3266]

Very informative, Thanks.

[@romrock2]

Thank you for another Great video ... What are some common Diagnostic codes associated with this problem

[@MotorcycleEnhancements]

Well detailed video. I have a spare one that I will open up and check everything you pointed out.

[@OuttaHere7]

One time my intercooler pipe got a hole in it and I experienced power loss. Took quite a while to find! I was glad it wasn't the turbo!

[@TheXabixu]

Superb video, very professional!

[@Sam-ws2if]

Excellent video and easy to understand

[@SurNavComms]

Very Informative, I now know how to diagnose my problem, hopefully it's external to the turbo and not expensive!

[@lloydmorrisonii1373]

Outstanding video! Thank you for sharing.

[@marcelmichaud4673]

everything should have a turbo,great job,thanks dude!!!!!

[@Antoniostubeio]

great video thank you for educating and sharing...

[@danbierschbach7743]

fantastic video bud.. very well explained.

[@johnmoser2689]

Excellent video... great detailed explanation

[@mkknight5652]

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

[@Lashaitaly]

Great and 100% correct info. Thanks. You rock!

[@scratchbuildermodels254]

A great explanation 👍🏻

[@bicksbarn]

Excellent video! Thank you.

[@1busterchops]

Thanks this was very insightful

[@makeminealarge1]

Very well explained, thanks for sharing.

[@Martini-nv9hh]

Brilliant and very informative

[@casualelectronicsissues1384]

glad I found this vid. super informative. troubleshooting intermittent power loss vw tdi '09. no cel/faults: only power fluctuations.

[@casualelectronicsissues1384]

re researching intermitt powerloss w no fault codes... thought it was intercooler water/ice, because all cold-starts are rough and sputter, but recent hose drain+inspection didnt show water or ice. there's a sound variation when accelerating that sounds like turbo or exhaust are being intermittently blocked or modulated aggressively. not happy with local dealer and mechanics.

[@27jezus]

Nice explanation pal...good video. I have a limp mode every bloody times I put my foot down. i wonder if a turbo cleaning would fix my problem.

[@irishsetter48]

Excellent video. Thank you.

[@MarcHess]

Very well done, thanks!

[@Carnutzjoe]

Great video. This explains a lot.

[@jurijavsenak]

Nice explanation. Now I can start diagnosing. 👍

[@maneki9neko]

Very nicely done.

[@astevo1983]

thanks. very helpfull video. Would really like to see a video on how to use turbo cleaning products like innotec, if you're planning anymore.

[@streakyfish]

Excellent explanation thank you

[@MegaJasperdog]

Thanks for posting ...good video.

[@Archer28M]

Were informative. Thank you.

[@Keewee2foot]

Very helpful thank you. Is it possible to clock/rotate the compressor housing on a Garrett gt2052v that has vnt? Or can it not be done because of the actuator and vnt system? Thank you!

[@baliiteee]

thanks for this video, very nice!

[@MrChri01]

Hi i came across a toyota hilux with this same issue 2010 hilux . Exhaust cabon built up in hot side around those vane

[@abz124816]

Great explanation

[@shallowkal]

Thank you, learned alot.

[@ANDREASRIAL]

Great explanation. Thanks

[@MrChrisgilbert1977]

Great video man. Thanks for the wisdom :-) Do you know much about the HDI engine turbos? Cheers.

[@miketaylor6282]

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.

[@GasBunny]

Great video!

[@WhosthatTeamAFC]

Amazing video.

[@garrettberglund5876]

Amazing video

[@THEGREATONE420]

you da man... very nicely explained bro.

[@amana1480]

Thanks for the explanation. I keep getting overboost then limp mode. Can this be due to not enough vacuum/faulty vacuum pump? I have a Garret Turbo on a BKD VW Golf Mk5. How can I check I have the correct vacuum to operate the turbo?

[@thesaabisturbo]

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.

[@davestewart9405]

Thank you 'simply put ' and very interesting ;-)

[@dumuzi9662]

Im grateful for this video Thank you

[@louisgunn]

thanks for posting

[@StormSunday]

very clear good job

[@aliazmoodeh6283]

Its very nice video thank you

[@pamelaparker4143]

you are a genius. thank you so much

[@ShortArmStrongArm]

Excellent. Where does the vacuum come from? Thanks.

[@Qkriek]

Very cool, thanks!!

[@robbyalmendrez1750]

This is an interesting video very informative. I have a question and I really can't decide what my car problem is. I have a 2002 Kia Sedona 2.9L TCI Diesel Engine and one time after a stop for an intersection, the vehicle does not respond anymore to my gas pedal. After several on and off the HOLD light suddenly flashes. Is this consider a lymph mode also? And I notice that the air coming in to my turbo is not that strong anymore not like before that my hand sticks on the hoses whenever i cover it up but now it's too weak. Could this also be the problem? Thank you so much, I wish I could hear from you soon.

[@rehanbhai4062]

Special thanks good explanation 💓👍

[@V10PDTDI]

Hi you did not mentioned the position sensor and associated wiring that causes fault code and low power I work on vw every day I can fix the actuator on a vnt 15,17 or kp-39 but no answer for the stock turbo on the BRM engine like you have in the video and the actuator is pretty hard to remove in place in the car the motor and Turbo you have for a display was quite clean it must had no millage. ho and I almost forgot the white and black check valve is important and the VP on ALH tend to leak

[@ricardogonzalezrivera2557]

excelente video lo felicito

[@GdaySport]

Good video mate :-)

[@deltabelg]

great video!!!

[@jeangu2002]

I think i just found out why my car loses power when i drive uphill. Thanks for the video

[@peterschulhof9179]

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?

[@ousmanesarr7287]

very well explained

[@theblazzed2114]

First and foremost good informative vid! I think mine is the last sign of fails. Hesitation and the acceleration. Not super obvious to be rough but feel able. The Audi is 240k is cleaning the VNT will do the job? THX