Performance issue Golf 4 TDI (engine code: AJM)

Hello everyone,

I've been following various topics in this forum for a while now, and I've also read several specialized articles. Because I'm currently facing a small problem, I thought I'd reach out to you all.
I've been feeling for a few days, maybe weeks, that my car isn't pulling properly, and I think I might be imagining that it sometimes hesitates for a brief moment when I accelerate, and then continues to accelerate.
Therefore, I conducted some measurement tests and hopefully presented the results in a clear and concise manner.
You can find blocks 8 and 10, as well as blocks 3 and 10, in the Excel table.

It would be really helpful if someone who understands this could give me some advice. Initially, I suspected it might be a problem with the mass airflow sensor, but I'm not so sure anymore, given the actually good readings.

Best regards,



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Hello.

Okay, I think the LMM looks good. But when you press the accelerator, you get a boost pressure overshoot of up to 2400 mbar, and just a fraction of a second later, it drops to 1880 mbar. It then stabilizes at 2100 mbar within 3 seconds. I think that's the turbo boost pressure for the AJM engine.
I would like to check the VTG (Variable Turbine Geometry) vanes on the turbocharger to see if they are moving freely. And next time, please record the key press ratio of the N 75 (or don't delete it).

Best regards, Charly.

Hello,

I'll try experimenting with the duty cycle tomorrow. It's good to know someone agrees with my thinking. You can see the boost pressure quite clearly on my boost pressure gauge. When I accelerate, the gauge usually goes up to 1.2-1.5 bar and then drops back down to just below 1 bar. At that point, there's not much change until I release the accelerator.

I'll get back to you when I have the other measurement.

Best regards and thank you.