Citroen C4 2.0 HDI 2005: Engine Jerks at 1500-2000 RPM, EGR Replacement & Turbo Valve Update

Car: Citroen C4 2.0 HDI 2005
History: the engine worked unevenly (I do not know why, the owner claimed that shortly after the purchase and over time deteriorated). After replacing the injections, the work returned to normal, but there was jerking.
Description of the problem: The engine jerks at a gentler acceleration in the range of 1500-2000 rpm, but it happens lower and higher. When jerking, you can hear the engine interruption, as if the car was jerking while towing. If you press harder, break once or twice and pull.
Vacuum valves from the turbo and throttle changed with a car in which they worked well and no effects.
After disconnecting the EGR, the problem disappeared. So I bought a new Delphi EGR. I removed the errors and programmed it for the car. And then it tugs. There was an EGR error but also a turbo copy sensor, but after removal it did not repeat.
I suspected throttles so I connected with a wire both vacuum hoses going to them (turning off the throttles) and then pulled, so I can eliminate these valves.
So I replied the new EGR again and the engine works beautifully. No errors (except EGR, which will appear soon). Unearthly acceleration, no jerking, power at full speed. I have no ideas anymore.
DPF was replaced about 40 thousand km ago (according to Diagbox) and shows 25% of filling with almost no pressure difference (i.e. clean).
The timing has been changed recently and I am 100% sure it is well folded. I also exclude it because the engine stops pulling after unplugging the EGR.
Tomorrow I will check how they hold these vacuum valves that are installed, but I do not want to replace it in the dark.
I suspected the turbo copy sensor, but I think it would show an error.
I exclude turbo or injection because it works beautifully after removing EGR.
I would be grateful for any tips.

Today, I connected both vacuum hoses to the throttle control valves, excluding the passage of these valves during operation and jerking only got worse.
I will replace the turbo control valve, although I am beginning to think that this is not the reason if the egr is disconnected and the pressure is removed from both valves, the problem disappears.
I have read several times that even many blindness of the new EGG helped, so I wonder if sometimes the control is broken. Either a distorted sensor or an error in the program, or maybe an electrical fault.

And how did you deal (if any ...) with this fault?
I also fight it in C5 2.0 hdi 2004 FL. The mechanic stated the so-called cold February in control, probably in BSM (cost of a new one in ASO about PLN 1000 + coding).

Unfortunately, this is not the case only EGR blindness has helped. Works fine but this is a temporary solution.
I will still burn DPF as soon as the fluid reaches me, because my predecessor reset the fluid and liquid meter in the pot.

I fought some time ago with 407 2.0hdi RHR identical symptoms and also EGR disconnected and calm. After all possible measurements I replaced the SID with another one but I didn't have the A terminal and I gave the sid 803 and only the radiator fan worked all the time. With the tip A expensive as hell, the customer did not want. I returned to the original and took the car.

And how did you solve the immo problem?
I suspect the old soft which was not changed after the EGR exchange and as I remember probably in 2006 or 2007 they changed the design a bit.
I'm not talking about calibration here, but about my suspicion that ecu is still trying to control the new EGR according to the parameters of the old type.
Unfortunately, I only have a Chinese fake cable that probably does not program.

Driver for virgin and adding diagboxem

If I buy a "starter kit" (bsm, ecu, bsi, ignition) with the same numbers as for me, it is enough to translate, do you need to program something (telecode) ??

By all means, sometimes the bsi configuration will be different from yours, and the mileage will jump larger depending on where it will be. Ie, if in bsi I will write to the counter, and vice versa. What driver do you need?, And send me a photo bsi at melaswlkp(_at_)poczta.onet.pl

melas wrote:

By all means, sometimes the bsi configuration will be different from yours, and the mileage will jump larger depending on where it will be. Ie, if in bsi I will write to the counter, and vice versa. What driver do you need?, And send me a photo bsi at melaswlkp(_at_)poczta.onet.pl

Thanks for the info, I am waiting for confirmation that it is definitely a driver, if I speak to you.

I am asking for advice on what to do in this topic because it is the same for me.
Vehicle Fiat Scudo 2007 RHK engine 120KM.
With steady acceleration between 1500 and 200, there was a jerk as described above. Yesterday, as part of the test, I connected him to the art by jamming EGR taken from the RHR wife (the built-in was unfastened, it remained as a plug). It was perfect until the error lamp fired. The lamp, of course, turned on because the valve is jamming as I mentioned and I found it in the very open position. Probably the driver, after he opened it, wanted to close it, but it failed.

I ignored the system and did 140 km, then found that he burned too much (the refill turned out to be over 0.5 liters for 100 more), so I reconnected the built-in EGR.

And here's a surprise: something has been mixed up in the adaptations or settings that my EGR works better now. Well, while the previous jerks could be compared to deep pumping with the gas pedal in a 1s cycle, now these "amplitudes" of jerks are smaller (if I fan the pedal less) and much faster (at least 2 per second). Their range of occurrence has also decreased, which means that there is such a useful range of accelerator pedal position where they are almost absent.

What is it all about, once on the Citroen forum, and probably even Electrode, they wrote about some flaw of the software, which in the newer incarnation of Siemens was improved and this engine worked more evenly. Now you can't find anything about it, everything is lost ..