Audi A3 1,9 TDI, - Leistung erst ab 2800 U/min (Gelöst) | Posts 16+

I don't understand it.
- If the injection timing had been set as early as described, the engine would have experienced extreme knocking at low RPM.
- Early torque peak (EZP) would have clearly favored better acceleration from lower RPM.
- No reason found for the lack of boost pressure.
Why were the exchange transactions mentioned at the beginning actually carried out?
hg
Herbert.

Edit - this is the second case for you with an injection pump that was turned on too early, see https://community.dieselschrauber.org/en/viewtopic.php?t=26822 from last fall.
Is this being "optimized" in a way that involves "material destruction," as the keyword "material murder" suggests?

"The Audi belongs to a friend of mine, and he asked me for help! My Golf 4 had a similar problem in a previous report, but that one had an LD (likely referring to a specific modification or repair), and the symptoms were slightly different. Since replacing the pump, it's been working fine. It's quite possible that the Audi's pump is also showing signs of wear or has become misaligned. My friend has been driving the Audi for a few years, thinking it was supposed to run like that, and then he came to me, and we started troubleshooting."

Herbert: Regarding tuning and potential damage to the engine, I can't be held responsible if these cars were already poorly tuned by other people beforehand. I simply have the ability to install the original software or a tuning program that is of very high quality, or to fix things in a way that the customer desires, so they can enjoy it for years without any problems! The previous modifications were done by a friend before the customer came to me. I only replaced the cracked vacuum hoses, pressure-tested the intercooler system, checked and re-flashed the chip software!

Autoservice wrote:

Did you also check the timing? Keyword: crankshaft pulley. As I said, the pump does not adjust itself automatically.....

The pump was adjusted and supposedly checked at a VW workshop. Let's see if this lasts, or if the timing will shift again. My friend will let me know if anything is wrong again!

Even though I don't believe it's the AHF, I'll check it as Autoservice says, and definitely check the KW wheel.

Quote:

Even though I don't believe it's the AHF, but check what Autoservice says, it's definitely the KW wheel!

I don't think so either, but you never know... That's why I'm asking about the valve timing.

If they were also misaligned, the assumption would be justified. Unfortunately, we cannot provide a qualified statement about their actual condition.

But still, thank you for the feedback .

We will conclude here. If anything else arises, please send a short private message.

Quote:

Since the pump was replaced, it has been working perfectly!

It is very unlikely that the pump is the cause of the problem.

In the log, you're seeing only 500-600 mg/h of air mass at a boost pressure of 0.6-0.8 bar. Either the mass airflow sensor is giving incorrect readings (defective or incorrectly installed, or the data set is corrupted at that point), or the engine is actually drawing in so little fresh air at that moment due to, for example, incorrect valve timing or issues with the EGR system.