OK, I've done quite a bit in between. I have taken into considetaration all that everyone has written on here. So I thank you all. Here it goes:
1. Checked continuity between the coil loom and the ecu. Eveything checks out.
2. Borrowed a brand new bosch s4 007 battery.
Made no difference this far.
3. I read the workshop manuals that
@rotifer II has provided and more particularly the measuring block/diagnostic sections. Despite them being for the 1.4 I was able to understand many things.
4. I read most of the forum posts on here regarding the misfire detection of the ECU, etc.
5. In combination with the well-catered label file of
@PlasticMac/
@Andrew I was able to make some sense of the readings and the output tests, and basic settings.
6. I am still not very familiar with the terms lambda and fuel trim the way they are presented in the label file but there can indeed be a stuck injector on cylinder 4.
7. In the manuals it states that if the msifire detector (not the error code) reports a misfire then the EGR can indeed be the cause. The EGR is closer to cylinder 4. I get a lot of misfired on 4 and less than 2 on cylinder 3 (practically never in nearly all of my tests).
8. Fuel pressures are what they are supposed to be.
9. After running the fuel trim test it appears that things got better with the misfire rate number on 4 reduced but not zeroed. There are periods when there is no misfire at all. It is actually a lot better than before. I cannot exactly remember how the previous engine was 2 years ago but this is close, the idling seems the same. So I am thinking that whatever is wrong with the injectors now, must have been there back then also.
10. I have not checked the resistance of the injectors. I could have done so but forgot.
11. I can get new injectors from a shop in germany with at the cost of 150 euros each. I cannot find any one in Cyprus that refurbishes injectors and sending them anywhere is false economy. I might as well buy then new. Which is a lot of money.
I will get 2 tires for it, get the tracking done, MOT and a 3 month tax and insurance. I cannot see anything else wrong with it at the moment and I might as well use it to see if anything else pops up.
In the best of cases the injectors are shot and I have to get anothe set. In the worst of cases the engine is toast and I scrap it.
Evros