Is my turbo dead??

[Ma6A6]

I have been dealing with no power and a P0299 code in my 2.0T as you can see here

http://www.audizine.com/forum/showth...Boost-problems

So far I have:

• Replaced DV
• Replaced N80
• Replaced PCV

Installed a Cheap boost gauge just to see if there is any boost (the gauge is working good)

Today I tested N75 disconnecting it from the wastegate to see if there is some boost and the result is 2psi. when in idle the gauge is in 7 below zero.... the most I got even with the wastegate disconnected is 2psi

What should I do next??? is my turbo dead???

Any help will be really appreciated
Thanks in advance

[jbain2]

With the N75 disconnected you will not get any boost. It sounds like at the very least you have a severe vacuum leak. At idle you should be seeing at least -20. Have you done a boost leak test?


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[Charles.waite]

Idle vacuum with a Tiptronic should be in the high teens (18-19 I think). Idle in a manual is in the 24-25inhg range. Stock boost should be from 10-12psi.

[jbain2]

I looked at the log you posted in the other referenced thread. The specified boost is way out of whack. Regarding the vacuum, either way it's not right. I would focus on why the ECU is requesting the boost that it is and why the requested isn't being met (fortunately). I would think about replacing the N75 and see what happens. May also be helpful to log with the N75 unplugged to see requested vs. actual boost as well.

Also log block 114. That looks at your wastegate duty cycle which is controlled by the N75.


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[Ma6A6]

Thanks for your answers!!

Well... today I tested the system looking for boost leaks.

I blocked the intake hose after removing it from the filter, as well as the two hoses going to the valve cover. Also blocked the hoses going to the N75 and the hose that connects to the intake manifold and from there I pressurised the system with a bicycle pump. The system held 10psi.

I'm waiting for a new N75.

What else should I look for???

[DanKing]

I just had a boost issue, my car would peek boost at 2psi. I got a code once and it was the p0299 code also. Replaced my n75 and everything is back to normal. So hopefully that is your issue since it is easy to change out and cheap (cheapest place to get it is FCPeuro.com)

[Ma6A6]

Hello Again!!

The N75 and several clamps had been replaced but seems that there is no big improvement. Vac is now 8-12 and boost at 2000 is 0 and slowly increase to 5psi at 6000.

Still pending to do a Boost log to check what jbain2 said about the required boost is to high. How could this be??

Most of the times starting to move from stops is really hard, car feels really "heavy" and I don't know where else to look for the problem...

Any suggestions will be really appreciated.

Thanks in advance

[jbain2]

Boost/vacuum leak and report back. Your vacuum is way off.


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[Ma6A6]

Thanks jbain2, i have done a boost test and it was ok from filter to throttle body. It held 10psi.

As for vac I have no idea how to test... I will search for a DIY and report back

[kTaLgsTo]

Find somebody with a smoke tester and smoke test the car, anywhere with a vac leak will pour smoke out. I have a local shop that does it for 75.00 US. but if you can find somebody with a smoke tester and get it done for free that would be sweet...

[Charles.waite]

What vacuum lines would you be testing? The 2.0t has like 2 of them. And one of them is for the brake booster and uses an external vacuum pump.

[Sanjman]

If you can't find a leak... consider checking your catalytic converter and seeing if its clogged. That would be your limiting factor to getting boost. It takes a lot to clog a cat, but mileage, lots of burning oil / coolant from the past can add up. If your exhaust tips are charred black, you may have your culprit.

[Ma6A6]

Thanks Sandman... I will try to test the catalytic converter. I think a boost gauge connected where the pre-cat O2 sensor goes could work, is this correct??? I should look for very low pressure right??? <1.5psi ???

[Sanjman]

Thanks Sandman... I will try to test the catalytic converter. I think a boost gauge connected where the pre-cat O2 sensor goes could work, is this correct??? I should look for very low pressure right??? <1.5psi ???

How the hell would you get a boost gauge there?

Easiest way is to disconnect the cat and take a look at it I think.

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[jbain2]

How the hell would you get a boost gauge there?

Easiest way is to disconnect the cat and take a look at it I think.

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Log EGT with vag-com. If cat is clogged temps will be way up. I don't think this is your problem. Would still get log of N75 duty cycle as well as requested and actual boost simultaneously.


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[Ma6A6]

How the hell would you get a boost gauge there?

Easiest way is to disconnect the cat and take a look at it I think.

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I was thinking on removing O2 Sensor and put an adapter there to connect a tube or hose just to test...

Log EGT with vag-com. If cat is clogged temps will be way up. I don't think this is your problem. Would still get log of N75 duty cycle as well as requested and actual boost simultaneously.

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I have been reading a lot and I didn't consider the altitude factor regarding vacuum... I live at 2450m / 8000ft so I think 10-12 negative readings are ok right??

Today I made a new log considering altitude and the problem seems to be that it takes a lot of time to create boost.

https://www.dropbox.com/s/vigaxx5fkd...4-115.jpg?dl=0

Am I correct??? This is my first Turbo car so all this vacuum/boost issues are new to me...

[Charles.waite]

I don't think a boost gauge is going to handle 600° exhaust particularly well. But even then that's way more effort than just inspecting the cat. Not to mention when you do get a pressure reading you have no control value to gauge it against so how do you know what to do with the data?

[PedroPickleB7]

What you can do is fill it with water and see if it leaks out of the tail pipe

[Ma6A6]

Well, at the end the problem was the waste gate... After removing the four nuts to check the Catalytic converter I decided to check the the wastage valve and the flapper was loose so I adjusted it.

Without any pressure in the actuator I was able to turn the adjusting nut like 3 turns, after that I applied pressure to the actuator and give it 1 turn more, reassembled everything and now it is boosting 11psi.

Thanks to all who takes some time to help me!!!