Citroen C4 GP 1.6 HDI: Experiencing Jerks and Interruptions during Cold Engine Start-Up

Hello colleagues.
For several months I have been struggling with an undiagnosed defect in my Lemon C4 GP 1.6 HDI.
After starting a cold engine, it works equally well, but after starting and shifting to a higher gear, there are one-second jerks / breaks - as if something was slightly stuck and immediately disconnected. This also happens after the vehicle exits the turn adding gas / where the vehicle tilts and returns after the turn back to the vertical. Interrupts appear sporadically and disappear immediately after the engine warms up.
The engine runs evenly after the engine has warmed up. Very good acceleration. The only error code that appears during diagbox diagnostics is a power failure of one glow plug ...
I do not know if in this model the candles play a key role after starting the engine, i.e. do they maintain the temperature in the combustion chambers for some time to even out the engine ??? / and whether the burned candle would have an impact on these interruptions. As I mentioned, after warming up the engine everything returns to normal.
Recently replaced or repaired:
- turbine solenoid valve;
- injection regeneration;
- replacement of all filters;
- checking the flow meter;
- FAP regenerates properly;
I have some suspicion that it may not close EGR - but the error code is missing.
I know that blinding will not do anything in this vehicle because the software can still see it "
I have not tried to disconnect the plug from the Flap, which also controls the EGR, Safe mode will probably light up, but I do not know if this is a good lead ???
I will be grateful for any suggestions.
I greet my friends beautifully. Paul.

Don't mess with these stupid ideas because it won't do you any good. Toy car at the computer and look at the parameters of how the EGR works and whether the flow indications at different degrees of valve opening change. With this engine, the candle may also be to blame due to the fact that during the FAP after-burning, the candles are warmed up to increase the combustion temperature in the engine compartment, which improves after-burning of the fap.

Thank you colleague for the answer ..
The computer does not show any errors other than the burned candle, so I hope she is to blame for everything. I was just thinking about the EGR throttle not closing - where the margin of error is small and the computer does not yet detect it as an error .. However, you are right. I guess you should start with what is known.
Of course, the witty French had to write candles behind the rear engine bulkhead to make life easier. Because of this, good access for the watchmaker. Replacement b. Expensive and probably a greater risk of the candle getting twisted

I do not understand what the problem with candles? You give to a site that makes French cars and exchanges. The risk is then theirs.
Why didn't you buy a "belt in tdik" since the witty Frenchmen were so fierce ... the engine.
In this engine, the candles heat up the engine as it is cold, so it may matter.
Although I would concentrate on the fact that the symptom appears after exiting the bend, heel. Is the effect the same with a full fuel tank?
IN.

Haaaa, you're right ... "they saw the gala what they were taking" - I have nothing to complain about now ...
I am very grateful to you for confirming my assumptions about maintaining the temperature in the combustion chambers in the initial phase ... because the symptom disappears completely after driving 2-3 km ...
When it comes to the roll of the vehicle after entering the bend and adding light gas after exiting the bend, jerks / "slight tapping / smothering" appear only in the first few minutes of driving from starting a cold engine at night / - then of course the car drives like gold. Thanks for the suggestion because I did not check if this phenomenon occurs after a full refueling of the vehicle .. However, I noticed a certain regularity that the higher the ambient temperature is this symptom did not occur / e.g. in summer / almost at all after starting the ride, or much less often ... I even thought about getting the fuel system airy ??? Of course, this is my reflection - maybe not accurate . What you wrote about maintaining the temperature by the candles in the initial phase of heating the engine could actually coincide with the temperature outside. I am going to send you that if it is very positive, the combustion chambers are not so cold and the heating time is much shorter and even with a burned candle there are no jerks then. Of course I do not want to mislead you with my layman's suggestions, but it may give you an additional picture of the situations in which this happens.
I also noticed / of course, I mean all the time the initial ride - the first 2-3 km. when driving with steady leg support / without adding gas / - you can feel the pulsing "forward / backward" as if the vehicle was hesitating whether to drive forward or backward >>.

And how did the story end?

I have a very similar problem ... on the computer shows that it is poor with correction of injection, but would it cause interruption, jerking and stalling of the engine? I replaced the computer because it was defective and helped for a while, the gas pedal new .. I need to check the flow issues ...

And how did this story end?

Such a small bastard, shaft position sensor .. which did not show a problem on the computer until it completely fell and it was impossible to start the car.

So this is a standard - drive and observe ... until something specifically falls

No, something showed an error from time to time, but I bought an elm27 or something .. OBD on BT .. And I checked it myself .. And so I caught it, but I did not remove the fault because my brother-in-law wanted to borrow a car, so I told him to be careful because he interrupts .. And the next day I called for a lawete. In general, I had poor mechanics ... I exchanged things for 2,000 And you could start with that for 150 PLN with exchange

Grandfather 2006, but the mileage is original, it's a pity to sell for pennies, sooner to tuneup I'll take him

I have a similar problem in the 1.6 e-hdi engine, engine code 9hd, namely after a night stop when the outside temperature is over 20 degrees as I drive at a constant speed around 2000 rpm. And suddenly I gently press the accelerator pedal, there is one jerk and such a rattle of the engine. After driving a few kilometers, usually 2/3 of this jerk does not occur. The strangest thing is that at temperatures below 20 degrees, everything is ok, even in winter, below 0, everything is ok, in general, the engine works perfectly. 0 errors in the driver.

Apart from the colleague who replaced the shaft sensor, has anyone had any other solution?

What about the temperature sensor? Has anyone considered this, does temperature affect fuel delivery?

do you have any fault codes?