G3 AFN: No Boost Pressure After Inspection

Hello,

For the section titled "You can never think of something as stupid as what life sometimes throws at you":

The buyer of my old G3 told me today that the car hasn't been pulling properly since the last inspection, including the timing belt change.

After a few meters of test driving (thanks to the LDA), it became apparent that virtually no boost pressure was being generated at low engine speeds.

2. While idling, the control hose was disconnected from the pressure sensor -> no vacuum could be detected.

3. Engine turned off, and the hose was disconnected from the vacuum inlet of the solenoid valve "ziiisch" (the vacuum reservoir fills with atmospheric pressure) ... aha, so the vacuum reaches the valve. The connector is firmly attached.

4. I traced the fuel hose from the valve to the charge air cooler - wait a minute, it's attached behind the diesel filter, even though there's no mounting bracket there? I pulled on it - nothing, it doesn't move either longitudinally or laterally.
Did they perhaps squeeze him in with the new diesel filter?
However, that's exactly how it was: The hose naturally positions itself so that it runs along the lower edge of the filter on the strut tower, and when the filter is tightened, it is securely pinched. This prevents the turbocharger from experiencing negative pressure, the VTG (Variable Turbine Geometry) remains constantly open, and only gradually builds up pressure from around 2500 rpm.

5. Filter removed, fuel hose pushed back, filter tightened... and the AFN is now drawing fuel properly again.


VAGCOM would have naturally said, "no boost pressure despite a correct boost pressure solenoid valve ratio."
What is your estimate: In what percentage of VAG workshops would you receive a new turbocharger for this problem, or at the very least, a new LD solenoid valve?

Quote:

at the very least, a new LD solenoid valve should be installed

.

that the G3 AFN still costs a fortune!

Strictly speaking: ONLY 110 EUR.

m;

It would be helpful if Rainer could post this under 'Troubleshooting & Guides' .

Nebelwerfer_TDI wrote:

It would be helpful if Rainer could post this under "Troubleshooting & Guides".

I can do that too... but I'm not sure if it's too exotic, so "my" hose fits perfectly behind the DiFi, being the only one that does out of 100.

And finally, it's already listed (with the hose bent instead of crushed) in the error list in the FA (Factory Acceptance) documentation regarding the pneumatics .

So, 'my' hose managed to get stuck, and it was the only one out of 100 that ended up right behind the DiFi.


No, I meant generally... you should become suspicious if a hose is routed in a way that seems 'unnatural.' I once had an AAZ engine that took forever to develop power, and it turned out that the hose for the turbocharger boost enrichment was pinched and flattened under the crankcase ventilation system.

And when do you think that will happen? - Right - when they had removed the valve cover during the timing belt change at the friendly mechanic's shop .

What is your estimate: In what percentage of VAG workshops would you get a new turbocharger for this problem, or at the very least, a new LD magnetic valve installed?

Consider that these little issues contribute to a not insignificant extent. I wouldn't even consider it unlikely that an unsuspecting customer would be sold a brand new charger. After all, the 'specialized workshop' will know what's wrong with the car . Most likely, they'll tell the customer that a charger like that isn't worth it for an old G3/Passat/Polo/or whatever, but that they can trade in the car when buying a new one. With AGR, MAF sensors, R109, etc., it's the same recurring problem. Well, every day, someone gets taken advantage of .
Therefore, they are only allowed to access the air conditioning unit near my aquarium, and that's a good thing (a climate control device is a bit too expensive for home use).

hello

What is your estimate: In what percentage of VAG workshops would one receive a new turbocharger for this problem, or at the very least, a new LD solenoid valve installed?

I would confidently say that in 9 out of 10 cases, a new charger will be needed, and it's best to replace the vacuum hose as well.
since the old one was accidentally crushed under the diesel filter and is no longer in good condition, and then the car runs like new again .

greetings

hb2000

In my opinion, that's likely heading in that direction...

The demigod in Weis messed me up during a surgery in an overworked and loveless operating room.

...and then to stubbornly claim that the complaints were solely due to my terrible lifestyle and my inappropriate handling of the wound/healing process.
lie (verb)

Lovely crap.

'Here, we can still find ways to help each other, thanks to Rainer and his team.'

But what kind of major economic disasters are likely to occur in German private households as a result of this?

If I were just a little bit more paranoid, I might sometimes lean out the window and suspect malicious intent on the part of these damn dealers.

'Isn't that bad enough already? ATU in [City] once tried to tell me they would soon 'rebuild' my car, which had a residual value of just under €4,000, for a mere €2,500. 'No, I can't let you drive it like that,' etc.'

It's good that people in Eastern Bavaria trust in 'Warsaw Pact' and its affordable, fast, and competent workshops. While we're here dealing with reckless parts replacements (do VAG 'partners' receive commissions from KKK and Garrett for inappropriately replaced turbos?), the mechanics from the Czech Republic are still capable of improvising solutions for a reasonable price, if necessary.

The irony is that people who can't afford to fix their cars will eventually end up paying the same price as those who buy new cars, except they have to pay the price in countless repairs instead of financing it all at once.
For that, these people always drive around in old, thirsty, and sometimes unsafe cars.