Large Pressure Canister Conversion Help

Hello,

I have a Golf 4 from 1998 with an 81kW TDI engine (AHF), equipped with a Garrett turbocharger and a smaller wastegate. I'm not sure if the variable turbine geometry (VTG) is actually sticking.

However, if you accelerate in a high gear, then suddenly release the accelerator and then reapply it a short time later, it sometimes takes a very long time for the power to become noticeable again. Sometimes, it kicks back in immediately.

Unfortunately, I'm not an experienced mechanic, and I'm not comfortable working on these parts myself. Is there anyone in the Osnabrück area who might be able to help me with the conversion to the larger turbocharger (of course, for a reasonable price)? Or perhaps someone here knows someone who could?

Stefan.

Hi,

Small boost pressure sensor on a Golf 4 with 110 hp... are you sure? I always thought those were only small on the Golf 3.

It's not quite straightforward, as it requires a very delicate approach. Subsequently, adjustments need to be made using LDA.

'Is there any way to verschandeln it, or could you try manually adjusting the VTG (variable turbine geometry)? We had a similar issue with a Golf 3 once. We used to pull a wire and repeatedly press the accelerator and release it...'

arne

Hi.

Using VAGCOM (a diagnostic tool), the wastegate control valve can be accessed via actuator diagnosis (with the engine off), and this will cause the variable turbine geometry (VTG) to move from stop to stop.
However, the vacuum pressure is only sufficient for a few complete cycles.

Unfortunately, with the engine running, the shut-off valve (at least on the AFN engine) is located before the turbocharger control valve, and when testing it, the engine will naturally stall.
Cleverly designed , especially because the charging system only resumes operation after the ignition has been turned off and on again – meaning that before that, you can drain the battery, but the car won't start anymore.

And after turning off the ignition and turning it back on, the actuator diagnosis starts again from the beginning, so the bypass valve for the turbocharger pressure control needs to be checked again --> see above.

I don't know if it's possible to bypass the software by directly connecting the battery positive terminal. If it is, that would be a relatively convenient way to reset the VTG (Vehicle Tracking and Geolocation system) and hope for a fix within a few days or weeks.

However, in the medium to long term, I believe that the large container is the only real solution.