Notlauf, höhrer Ladedruck aber schon einiges getauscht | Posts 16+

See above. Post updated.

See above. Post updated.

Hi,

Quote:

Could larger fuel injectors also be the cause?

Perhaps you should write down everything else you know about the car all at once. If information comes in bits and pieces, no one can really help you because they won't know your hardware configuration.

Of course, the fuel injectors also have an influence, but to assess that, it would be interesting to see what other factors are involved.

I hope you have a purchase agreement that confirms you're buying a car that is approved and unmodified – then you can probably just leave it to your lawyer to handle.

Due to the engine swap, the car has likely lost its operating license and approval (ABE).

Best regards,

January.

See above. Post updated.

Hi.

Could it be possible that the previous owner had the car tuned? Perhaps the engine control unit is compensating for excessive boost pressure?

Sure, here is the translation of the text from German to English:

"MFG" stands for "Mit freundlichen Grüßen," which translates to "Sincerely" or "Best regards" in English. It is a common way to end a formal letter or email.

See above. Post updated.

Hi.

Which valve?

Okay, so if the previous owner had the injectors replaced with larger ones, then the engine control unit (ECU) should have been reprogrammed accordingly. Generally, if more diesel is injected, more air should also be drawn into the combustion chamber.

You could try switching the coding from 2 to 3 in the engine control unit. This might activate the standard data set.

Sure, here is the translation of the text from German to English:

"MFG" stands for "Mit freundlichen Grüßen," which translates to "Sincerely" or "Best regards" in English. It is a common way to end a formal letter or email.

I would obtain a control unit for testing from the world's largest online auction site (making sure it has the same part number). Some people also use a popular method to increase the "LD" (likely referring to a specific parameter) by creating holes, cracks, etc., in the measurement line leading to the MSG (Main System Generator), thereby simulating a lower LD (possibly by tampering with the hose section within the MSG).
The previous owner might have installed a completely different turbocharger, such as a VNT 17 or similar, for which your engine control unit (ECU) is now adjusted. He quickly removed it before selling the car, realized that the car still starts, and then put it on the market.

You can safely remove the intermediate connector in front of the valve plate because 1. it's a potential source of errors and 2. it seems like the necessary box is missing anyway.

@ Strange,

I think you mean the hose from the boost pressure sensor. However, in my car, it's not connected to the engine control unit (ECU) anymore; instead, it's located on the pipe leading to the intercooler, making it an external connection. That hose has already been replaced once because a piece of it had broken off.
"Just now, I performed a basic diagnostic check. I tried to maintain 1400 RPM and noticed that after starting the log, the pressure increased from 980 mbar (boost control valve at 100%) to 1203 mbar (as soon as the boost control valve goes to 0%), and then remained at 1203 mbar even though the boost control valve is back at 100%. All of this happened at approximately 1400 RPM."
Habs aber auch nur für knapo 20 sec. gemacht. Is that enough?
The car was running and I could see the VTG adjustment.
Perhaps this will be helpful to one of you.
That's probably not normal.

I've updated the post now.

I just took the basic settings test for the VTG system. The difference between the minimum and maximum boost pressure is 250 millibars at 1407 RPM (see the corresponding documentation).
(Thread).
After that, I would rule out a seized clamp, especially since I can see the rod moving clearly and smoothly back and forth.
If it helps, I noticed during a subsequent measurement that the actual load (IST-LD) is consistently higher than the target load (SOLL-LD).
Can I draw any conclusions from this?
Perhaps the pole of the charger could be made longer? Otherwise, all other errors seem to be ruled out. As I mentioned, the charger is new. It's possible that it was incorrectly configured.
Best regards,

Simusas wrote:

If it helps, I noticed during another measurement that the actual pressure (IST-LD) is permanently higher than the target pressure (SOLL-LD).

For example, the difference between the actual and target pressure is constantly 200 mbar?

Quote:

Can I draw any conclusions from this?

That the software is not properly compatible with the hardware of the charging system (including the vacuum system!).

Quote:

Perhaps make the rod of the charger longer?

It would be worth a try, provided that the LD control (duty cycle) isn't already at its maximum limit when the LD is too high.

Hi,
I've now removed and opened the engine control unit (ECU), as it seems to be the only possible cause of the problem, to see if anything has been tampered with on the chip.
Here's a picture. Unfortunately, you can't really make out much of it.
Sure, here's the translation:

"Here are a few more details:"

MSG Type: 038 906 018J
No warranty seals damaged (because there were none).
Black sealant can be quite difficult to remove.
no visible solder joints or other chips.

Perhaps someone can tell me which chip would be replaced.
Can the engine control unit (ECU) be "chipped" only by modifying a soldered-in chip, or are there other methods?
via OBD, so that I don't even see it?

Thank you very much.


Okay, I'm just going to look into getting a new MSG now. Can anyone tell me what alternatives there are?
Here's what it contains:

038 906 018J

Thank you.

The two on the bottom left with the yellowish stickers (are those with the data that is important for driving). When they are replaced, there usually aren't any stickers left on them anymore.

Hello, unfortunately the problem still persists.
Can I detect chip tuning using VAGCOM, for example, by measuring the fuel injection quantity?
I would like to check the intercooler system again. What exactly does that entail? Unfortunately, I haven't been able to find any more information about it.
How does that relate to the EGR valve? Mine is still active. Could this error be related to it?
Had hints in the thread "Quality of refurbished chargers."
It should be noted that the car already produced some smoke after starting.
Thanks everyone, for now.
I hope I can find the error with your help.

You can use VCDS to check the fuel injection quantity and boost pressure. This should provide information about any potential tuning that has been done.

Hi,
Well, the problem is the excessively high boost pressure. It's constantly too high.
The LD sensor seems to be working fine.

Can a stuck-open EGR valve also be responsible for excessive boost pressure?
Mine is actually active.

What about the fuel injectors? They should be the 0.216 size, but without any software modifications (at least no chip replacement or soldering).

Unfortunately, I couldn't find a consistent opinion on this topic in the forum.

First of all, thank you to everyone who is trying to help me.