1,4 TDI: AGR-Ventil & Lambdasonde defekt? | Posts 16+

Hello.

It's similar to the V6 TDI; you don't really see much of it.
What do you think about using compressed air to seal something?

It's really fast, effective, and can be done with simple methods.

Go to the hardware store and buy two drain pipe closure caps in the right size (around €5). Then, politely ask at the local tire shop for a rubber valve (maximum €2).
Drill a hole in the lid that fits the valve, insert the valve, and it's ready to use as a pressure release tool.
"I'm taking the intake hose after the mass airflow sensor and using it to connect a Schrader valve to the cover, also sealing off the connection for the crankcase ventilation system. This way, you'll have the compressor and its output coupling right there with you."
With the other lid, I seal the hose that connects directly to the "throttle valve" on the intake manifold.
Adjust the pressure regulator on the compressor to 1.5 bar and inflate the tire using the tire inflator.
You will find the leak 100%.
You won't be able to find a better or safer way.


Regards, Mpire.

Mpire wrote:

Hello. It's similar to the V6 TDI; you don't really see much of it. What do you think about using compressed air to seal something?

Hi Mpire!
Thank you very much for the tip and the helpful description/illustrations! I will try it that way and let you know how it goes!

Regards,
Volker.

Hello everyone!

Unfortunately, I still haven't had a chance to look for the leak.
I already have the material that is needed for the test using compressed air.

Currently, I'm experiencing another issue with my Polo:
It seems like the system is constantly trying to regenerate the DPF – the characteristic noise is clearly audible. The DPF warning light has illuminated twice already. However, after a longer drive on the highway, it went out again. The engine oil level has increased by approximately 0.3 liters in a short period of time.
I generally drive long distances, but I encounter traffic jams every day.

I have now reduced the ash mass from approximately 68 grams to 43 grams.

Do you have any suggestions on what I could do or which stock market indices I should check?
By the way, the starting behavior is perfect!

Thank you all!
Volker.

Hi.

Quote:

I have now reduced the ash mass from approximately 68 g to 43 g. Do you have any suggestions on what I could do...?

Is this a joke? The thing is full. verschandeln the DPF. There's an article about it.

Best regards, Rainer.

Hi Rainer,

Thank you for the feedback and the tip!

Is it normal for it to be permanently regenerated?
And can this be temporarily disabled?
It will probably take me some time before I get around to doing any crafting.

Quote:

Is it normal for it to be permanently regenerated?

What should the engine control unit (ECU) do, in your opinion, when the catalytic converter is full and hardly any exhaust gases can pass through it?

Here's a log that might be interesting on this topic...

First, address the "offset differential pressure," which means checking or replacing the sensor's tubing or connecting tubes and the sensor itself.
Otherwise, the "readings" are for a metric ton.

With over 300,000 km, the DPF is likely already full and would need cleaning or replacement anyway, so this would just be another issue to address.

Best regards, Rainer.

Hello Rainer,

Thank you for the tips!
I'm planning to do it on Saturday. I've already obtained the G450 cleaner, and of course, I will verschandeln the DPF according to the instructions. Unfortunately, removing the DPF from the Polo is quite complicated because you have to remove the engine support bracket.

I still have a few questions.
"Could the excessively rich mixture (see above) also be related to the added DPF? However, what speaks against this is that since the last repair (and thus since the excessively rich mixture), I can hear the turbocharger more clearly/louder than before. I'm really curious to see if and where I find a leak in the charge air system."
Can I use copper paste instead of thermal paste for screws?

Thank you everyone!

Hi there,

First, verschandeln the DPF and then see what other noises there are. Years ago, I had a Passat (petrol engine) with a catalytic converter whose internal components were melted. Initially, this was only noticeable because the seals in the exhaust system before the catalytic converter failed... (with corresponding noise).

I don't see any reason why copper paste wouldn't be suitable. The only thing to be careful about is with brakes, specifically due to the ABS sensors.

Best regards from Berlin.
olli

olli wrote:

Hi, First, verschandeln the DPF and then see what other noises there are. Years ago, I had a Passat (petrol engine) with a catalytic converter whose internal components were melted. Initially, this was only noticeable because the seals in the exhaust system before the catalytic converter failed... (with corresponding noise). I don't see any reason why copper paste wouldn't be suitable. The only thing to be careful about is with brakes, specifically regarding the ABS sensors. Best regards from Berlin. olli

Hi Olli,

Thank you for your feedback!
Okay, I'm going to get started and take a look!

Best regards from Munich, from a "fishhead" from Lübeck.

Hello everyone,
Hello Rainer,

I was just trying to perform a forced regeneration.

However, it seems like the regeneration process failed because the load coefficient did not decrease during the regeneration, even though I followed the instructions (approximately 20 minutes).

Actually, it was like this:
Before the regeneration, the coefficient was 10.9%, but during the process, it increased to 14.9% and remained at that level.

The loading factor only reached 5.8% after the regeneration process was complete.

Can you give me a tip about what might have gone wrong?

Thank you very much!

dieselschrauber wrote:

Hi Quote: I have now reduced the ash mass from approximately 68 g to 43 g. Do you have any suggestions on what I could do...? Is this a joke? The thing is full. verschandeln the DPF. There's an article about it. Best regards, Rainer

, and...

Quote:

Mileage: 396670 km

If the DPF is too full of ash, it cannot be regenerated (burned clean).
If you see that the regeneration process is no longer lowering the loading value, immediately take the vehicle to a ramp or platform, turn off the engine, and remove the DPF for cleaning.

dieselschrauber wrote:

If the DPF is too full of ash, it cannot be regenerated (burned clean). If you see that the regeneration process no longer lowers the loading value, immediately move the vehicle to a ramp/platform, turn off the engine, and remove the DPF for cleaning.

Hello Rainer,

Thank you for your feedback!

I've now removed the DPF and flushed it out with a garden hose in the reverse direction of the flow.
However, only a few small black crumbs appeared at the beginning; otherwise, the water that comes out is completely clean.

Strange, right?! So, the DPF isn't clogged after all? Is it just the G450 that's faulty?
Can this be at 411,500 kilometers?

See the technical article; take a wire and measure what percentage of the DPF ceramic is free.

Black: This suggests a problem with Russ; possibly the combustion process couldn't be initiated during the regeneration cycle, or it was interrupted for too long afterward.

Best regards, Rainer.

dieselschrauber wrote:

See the technical article, take a wire and measure what percentage of the DPF ceramic length is free. Black: This suggests a problem with Russ; possibly the combustion process couldn't be initiated during the regeneration cycle, or there was an excessive delay after it started. Best regards, Rainer

Hello Rainer,

Unfortunately, I am unable to measure the channel length in the design of the DPF (Diesel Particulate Filter) in the Polo 9N3.

I immediately went to the garage after the regeneration drive and turned it off. I didn't have to drive around for long on my way to the garage either...
I tried using a pressure washer again... and it's the same problem. This time, I also saw some brown, sausage-like formations.

Does it make sense to reinstall the DPF? What do you think?