AUDI A4 1.9 TDI 100HP uneven engine operation after firing on a cold engine

Question

Hello, I have such a question, what could be the reason for uneven engine operation for a few seconds after starting a cold engine?
On a warm engine the problem gives way to the candles I replaced but it did not help. The car was connected to a computer and it turned out that pump injection bumps are quite high 84,95,89,99 block 13 and 18 is ok. I am asking for advice.

patryk44gks · Accepted Answer

I would suggest replacing the pump o-rings and checking the camshaft right away.
drop the cover and look at the roller and take out the injection plugs and plug in again and check the beam maybe something will help.

patryk44gks · Accepted Answer

Not necessarily, but it's worth setting it up as it should, so you can exclude it if you have any idea, you'll set the angle in 20 minutes if you have an interface

patryk44gks · Answer

If you have such a high, maybe the pump seals or the pumps themselves for replacement or regeneration, a worn camshaft quite likely.
Check the timing setting and check if the camshaft synchro in group 4 last window should be around 0 +/- 3

Added after 5 [minutes]:

And to start with, replace the filter, it can also be something with a vacuum pump

raffal12 · Answer

fuel dose corrections are good, this is block 13 and here is the problem with block 23, i.e. the solenoid valve opening time the norm is + -30 and for me as I wrote above ..

Added after 2 [minutes]:

I will add that under the power of nothing accelerated good combustion in the standard of 6-7 liters

Added after 2 [minutes]:

I forgot to add that all filters have just been replaced and of course oil

patryk44gks · Answer

In that case, replace the fuel filter first It turns out that they are already worn out and may have worn off, maybe try pouring some magical fuel into the fuel to clean the injection system.

raffal12 · Answer

I have replaced the fuel filter. Can there be gaskets on the pumps worn and these will be the symptoms ??

raffal12 · Answer

this car not long ago I bought and the previous owner reportedly changed timing before sale may be it good direction

patryk44gks · Answer

Check the timing setting and if you have access to the interface check also the timing cam synchronization

raffal12 · Answer

I checked block 4 this way:

Added after 2 [minutes]:

in the latter it fluctuates to 4.4 if such a norm is still acceptable or should it be corrected somehow ??? Possibly how to do it ??? I ask for advice

patryk44gks · Answer

Synchronization is out of the norm the manufacturer recommends around 0, and how to do it you will find on the internet after entering the synchronization camshaft 1.9 tdi

raffal12 · Answer

so that would be the main reason?

raffal12 · Answer

The problem seems to be solved. The reason was incorrect camshaft synchronization was 3.9 to 4.4 I adjusted to 0.0 and now it fires nicely. Thanks for the advice.

AUDI A4 1.9 TDI 100HP uneven engine operation after firing on a cold engine

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