How To Test a Turbo VNT / Wastegate Actuator (Vacuum Type)

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[@hrhlordwurlibird]

Invaluable info. Thank you Si. I fail to understand why there are 16 thumbs down here...???

[@gasgiant7122]

Hrhlordwurlibird Ah yes but 513 likes👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍

[@entieda8409]

that's why it's called the KZbin hate machine

[@iandorling]

Your videos are always spot on

[@crunchermuncher93]

-0.9bar (6-7psi) is the rated spring tension if anyone wants to know.

[@ΓρηγόρηςΚωνσταντινίδης-μ9ρ]

I have auq engine boost come and go and have missfire at steady throttle 1500-3000 rpm. Most when engine is too hot when is cold work almost every time.full bosst without bost on boost off like push the petal and leave and push again we can find what is the problem new plugs new coils bypass n249 nes n75 new blow-off valve

[@romainjojo2820]

Hi Si ! And take for all the content u bring us ! I bought a V70 2004 D5 and I have many issues which I find answers on your channel, such as EGR cleaning ( code P0401 gone ). Still have a boost issue that can causes trouble on going uphill. I feel like the motor don't have all the power it can have. Have a turbo whistle has the motor increase rpms. I don't know where to start tracing that problem ? I have no faulty code, only a old turbo wastegate range/performance which I deleted and never came back.

[@entieda8409]

You might have a cooler/turbo hose turning into a balloon or leaking at high boost, or a tcv valve problem maybe

[@entieda8409]

are there traces of leaked oil somewhere, follow them

[@robw321]

Hi do you have a video replacing the turbo waste gate actuator ? Also a link for the taster or name on ebay thanks

[@jayedwards7067]

Hi SiRobb thanks for the great vids,would the actuator be cycled on tick over or only on acceleration, sorry if that sounds like a dumb question,my 2002 d5 actuates on tick over not had a chance to test with vac pump yet

[@sirobb]

Hi. At idle, the turbo won't be actuated as such (at least not constantly) because no boost is being demanded. If you watch it from engine off to idle, yes you'll see it move as it finds its position. If you increase revs then return to idle, you should see the actuator arm move. It won't move as much as when manipulated with the vacuum pump because full boost won't be required or allowed when the vehicle stationary.

[@jayedwards7067]

its actually pulling full cycle on idle

[@sirobb]

+jay edwards When you say "full cycle", are you measuring your boost levels or just going by the position of the arm? What happens to the arm when you increase revs? I haven't personally observed the exact arm positions for different boost levels and instead use diagnostics. If boost is out of spec, I take it from there.

[@jst4fun22]

Not had a chance to see it when raising the revs It's booked back in to Volvo next week again but no one is able to cure it.it smokes @1800rpm not above or below don't do it till full running temp all injectors new egr clean full service history ?? 2002 d5 11700miles any ideas ??

[@sirobb]

+jst4fun22 If you've spent all that money with no fix, my first idea is to take it to a garage that knows what they're doing. 😢 Whereabouts are you based?

[@gheorghinacov6008]

What's the number of this part? I want to buy it and I can't find it...

[@doisel971]

Actuator is on the turbo. You need to buy the entire turbo to get a new one i believe

[@gheorghinacov6008]

@@doisel971 Found it already separately. You just have to look for WASTEGATE ACTUATOR

[@wilkas159]

So then vacuum is applied vanes are in closed position ?

[@sirobb]

Yes. Vacuum puts the vanes into the low engine speed boost position.

[@skypool100]

I've taken my 535d twin turbo for remapping, I've been told it's over boosting. Would this vacuum tester tell me if the actuator is doing its job and opening / closing the wastegate

[@dandyer8351]

Yes it would if its vaccume actuator

[@vaclavhanzl8193]

Guys please, anyone, help me, please. So I when I start the engine the actuator should suck in and move down?! Do I get it correct?

[@michalek00000]

What does will happen if I will block the vacuum pipe and I will run the engine? Does it gonna make turbo stall flutter sound?

[@robw321]

My xc90 2004 d5 the turbo whistles loud then car goes in limp mode until I turn of ignition the ok but can only drive car easy without this happening? How do I replace or fix this thanks rob

[@TheA-iu9ip]

If its a vacuum type, if i adjust the actuator does it mean i should adjust it towards opening the actuator or closing the actuator?

[@scottharriswestwalesfishin639]

P1556 /p1557 pressure control negative deviation any idea what could be problem??

[@mannehanni7499]

Could be a faulty waste gate or a faulty vakuum hose

[@bobbyperu8414]

if i wanted to check it on the other side of that hose ,where does it go? I have the angle gear in the way...

[@gasgiant7122]

Another great informative video, I have ordered a vacuum pump today so I can stop guessing, thanks again.

[@birminghampakkabaddiclub3790]

Much appreciated, thanks so much

[@bmw_crni]

what is a good boost, should they be actual and specified to be monitored and what are the deviations between them, how to adjust the lever on the actuator, it must be correct with a wedge on which it stops or lengths for 1 round of thread. I would not take the turbine but on the spot to set up bmw m57 525d 120kw

[@wetytbub]

When I do test like this I can not create vacuum, however when I reconnect the hose to the vnt, I can see the rod moving. If the vnt is broken can the rod still move? (car is a golf mk6 tdi 2.0)

[@peter12266]

Do you lengthen or shorten the actuator arm to increase boost ?

[@Djreucroft]

Shorten

[@axxisblack]

Can i connect the vacuum to any vacuum source from the intake? Thank you very much

[@Alexandru7305]

so, you introduce air into the actuator or draw air out of it. that I don't understand?

[@sirobb]

It's vacuum actuated so draw air out.

[@Alexandru7305]

​@@sirobb I have an audi a4 1.8t and for me the actuator only works if I put air into it, not if I take it out. is it working well or is it faulty?

[@steveprentice4513]

Very useful rob, thanks

[@RinosaurPravi]

0:01 how is that tool with watch called?

[@sirobb]

It is a *vacuum tester* amzn.to/3RUOUuK

[@jameslatimer1432]

Cool vid

[@alext.6541]

Thank You !

[@claymane91]

That cheap tester really sucks, if you don't have that vacuum tester you can get a hose and suck with your mouth, if the wastegate actuator works fine there is nothing to be worried about (it worked for me). next step is to test the vacuum pump in that case you will need a vacuum tester, then if you get a full reading you might test the vacuum boost solenoid (you might have full reading on the gauge). after these steps you will need to check the hoses. connecting vacuum pump to solenoid to the actuator.

[@TK42138]

Useful video.

[@FrenchValleyAirport]

That cheap ass vacuum tool you have sprayed hot brake fluid into my eyes (no i wasn't wearing eye protection), just becareful, i switched to mityvac and never had a problem.

[@dandyer8351]

Pay cheap buy twice

[@danielgoffin2472]

Hi SiRobb great videos, is it possible to replace the actuator without removing the turbo?

[@sirobb]

If you ever see advertised a "turbo core", that's basically a Turbo without an actuator so it is possible but difficulty of removal can vary across different designs.

[@danielgoffin2472]

+SiRobb sorry I meant to say it's on a 2002 v70 d5

[@sirobb]

+daniel goffin I see..... I've never had to do it but my hunch is that it is doable whilst still in place. Why do you want to remove yours? Has it tested faulty?

[@danielgoffin2472]

+SiRobb yeah it's not holding a vacuum anymore traced the problem back to the actuator

[@rm-we9xo]

Might i suggest using a camera man that does suffer from parkinsons

[@arschkopp]

isn't that a Variable Geometry Turbo?

[@sirobb]

They're the same thing.

[@arschkopp]

+SiRobb thanks, glad i wasn't totally wrong. btw you helped me a lot on my V70 D5. I was able to fix my Turbo Control Valve with just some Break Cleaner, saved me a lot of money :)

[@sirobb]

+Arsch Kopp That's great news on your fix, well done. I've got more videos coming in the next few days so hopefully you'll find those useful too.

[@PedjoGT]

Arsch Kopp ....you dismantle turbo for cleaning or?