Turbocharger Boost Hose Replacement (AMF)

Hello,

"Today, while I was driving on the highway, a turbocharger boost hose burst on my Lupo 1.4 TDI (AMF). Suddenly, the engine power decreased, and there was a loud whistling sound coming from the ventilation system, which I had turned off."
Over time, the power loss became increasingly severe, and the machine went into emergency mode.
"When you remove the underbody cover, you can hear a noticeable whistling sound coming from the front right side while driving. There is no more air coming through the ventilation system."

The car has always had a slight oil leak coming from the turbocharger through the air intake hose (coming from the mass airflow sensor). That's why the pressure hose on the turbocharger is also a bit oily.
There are no visible damages on the other rubber hoses. Unfortunately, the hose connected to the turbocharger is in such a difficult-to-reach location that it cannot be thoroughly inspected quickly.

The error memory obviously shows:
17964 - Charge Pressure Control: Negative Deviation.
35-10 - - - Intermittent

Is there any trick to accessing the hose from below to properly inspect or replace it?

It's incredibly tight between the suspension components, and it's hard to reach with even one hand.

Am I correct in thinking that it's likely the oily hose, or do you see it differently?

The problem is that I have to drive over 300 km every day starting Monday, and I really don't want to rent a car for that. Therefore, I would be grateful for any tips on how I can manage this myself, as I have very little time on Monday morning for incorrect diagnoses from workshops.
I managed to get my car into a workshop today, but the diagnostic scan didn't really confirm any of my theories, as it showed some boost pressure being built up, but no error codes. Of course, they then came up with theories about the mass airflow sensor and similar things.

Thank you for the tips!

Olaf.

Hi Olaf, the LLK (likely referring to a specific piece of equipment) and the piping are located in the front on the right.
I can't make sense of "Durch die Lüftung pfeift nichts mehr" .
"First, you said the hose burst, but if that were the case, we should see a tear."
If it's whistling, you should be able to locate the leak. If necessary, you can use leak detection spray and apply gas to help find it.
Driving 300 km in emergency mode? Forget about it.

Edit: Perhaps a sealing ring inside the hose has also come loose?
You'll have a hard time doing that without a lift. I mean, you'll need to remove the right wheel arch liner to access the power steering cooler.

"On the right front side, near the lower control arm, it's okay... That's the first thing I checked. I can access the lower control arms on the Lupo as well, by removing the underbody panel."
"The whistling noise from the ventilation system has stopped since I removed the underbody cover. The escaping boost pressure is no longer whistling through the ventilation system into the interior. This means the problem with the ventilation is likely just due to back pressure under the hood caused by the escaping boost pressure."

The hose doesn't appear to be visibly burst, but there's a loud hissing sound when pressure is applied. So, there must be a leak somewhere.
I'm more concerned about how to properly access the end of the hose connected to the turbo. It's not easily accessible from underneath either.

The suggestion about using inner tube patches might not be so silly after all...
"At least on my side, with the LLK, I never had that much pressure or buildup!"

How does the "search spray" work??? I can't observe any bubble formation, etc., because it only releases when there's more boost pressure than can be simulated on the dyno without a load.
When the engine is idling at full throttle, everything is normal.

Oh yeah, I was unfortunately forced to drive 200 km today. The approximately 330 km scheduled for Monday is also just the beginning. I'll also be adding at least 2 more trips this week. It's quite annoying dealing with the emergency mode.


Regards,

Olaf.

Today is the Lord's day, and nothing will be accomplished .

I would apply the air bubble spray to the suspected area and only use it briefly at full power (2000 RPM) for the first whistle. Then, place a listening device underneath to see where a bubble is located.
The hose needs to be removed, and if there's a seal inside, you should check it.
"The amount of air leaking through the seals due to oil seepage is, in my opinion, not enough to cause a limp mode. There should be more leakage, possibly even a torn intercooler."

Olaf,

I'm not sure about the AMF, but I believe it still has the old wastegate turbocharger and doesn't have a VTG (Variable Turbine Geometry) yet.

If I'm correct, this will cause the engine to shut down during emergency operation! A wastegate turbocharger can only be regulated to a *higher* boost pressure by the engine control unit (ECU) than what is mechanically preset. I only know the numbers based on the example of the 1Z engine: It was mechanically set to 0.6 bar and the ECU boosted it to 0.9 bar of overpressure. However, even in emergency operation, the system attempts to regulate to 0.6 bar, as this is mechanically predetermined.

If you're currently operating in emergency mode with a burst LD hose, the loader could suffer significant damage very quickly!

So: First, troubleshoot and repair, then continue driving! Otherwise, a charger failuremay occur, with corresponding consequences.

Even with a light load (e.g., electrical devices, air conditioning, etc.), at a moderate speed, a noticeable amount of air should be escaping from the leak point on the stage.

Regards,
Sure, here's the translation:

"Guste" is a German word that means "gust" or "gust of wind." It can also be used to describe a sudden burst of something, such as laughter or anger.

Thanks for the tips. Yes, it's a wastegate turbocharger that defaults to 0.6 bar in emergency mode.

The problem is that when testing at idle (regardless of the RPM), there's no audible escaping of air, even when squeezing one of the rubber hoses. When you accelerate, the hose can no longer be squeezed shut with your hands, but there's no whistling sound coming from anywhere.
That's why the workshop sent me home yesterday to read the error codes. They weren't entirely convinced that the fuel pump was broken. However, it's definitely clear that they know even less about TDIs than I do. That's already been demonstrated.

I've also considered the possibility of a crack in the liquid cooling system. However, there's a reason to believe that...

Please provide the text you would like me to translate from German to English.
Until a certain boost pressure is reached, no noticeable pressure loss occurs.

2.
When the underbody protection is installed, it directs a lot of the boost pressure into the interior ventilation, which prevents the air conditioning system from drawing in air from the front. This means the pressure can still escape relatively well to the outside in that area.

3.
The whistling sound seems to be coming from the area near the front right spray nozzle, where the turbo is located.

Where can I buy this excellent bubble solution? Is it available at hardware stores, auto parts stores, or somewhere else?

Regards,

Olaf.

Okay, LLK is probably not the issue if it's not whistling constantly and consistently.
There's a spray product available for gas, water, sewage, or RV heating systems.
I have, for example, Alltec leak detection spray, which is biodegradable.

http://www.mercateo.com/p/147-13245010044/Lecksuchspray_100_ml.html

Or maybe mix something with foam concentrate from the fire department? In a flower sprayer?

(edit: This spray is more suitable for finding smaller leaks.)

If you already know there's a whistling sound near the ventilation, then it's likely blowing air out from there as well.

The professionals made 2 caps for the LL pipes, one with a pneumatic connection to apply 1 bar of pressure.

Okay, the mechanic in the workshop on Saturday was either blind or his flashlight was so dim that I couldn't see the hole either.
I just put a bright light under the car and lay down, and had my wife press the gas pedal.
There's a hairline crack in the rubber hose, right next to the turbocharger on the inside, towards the engine block. I've temporarily patched it with several layers of heavy-duty tape, and I'll replace the hose part as soon as I get the replacement.

Certainly, thank you for the help.

I hope that this will protect the tank when it gets hot.

I don't have much faith in the Republican party.
As soon as I have the part, I will replace the hose.

P.S.
Sure, here's the translation:

"Just for information:"
The hose end cost me 25 euros plus tax. Well, hopefully it will last a while.