I presume its running all be it on 3 cylinders so we can presume its getting fuel. Need to find out if cylinder is getting a spark. If it is then its a good chance its something serious with that cylinder, piston or valves perhaps.
Find out which one you are missing and then you will be able to diagnose it much quicker. You seem to be chasing an ignition problem. A decent mechanic would not have "replaced the plugs three times, replaced the coils and then tried re-earthing the ECU".
What good would re-earthing the ECU do to solve a misfire on one cylinder? Have you gone to quick fit or something.
Find a better garage and don't pay a penny. Get them to put the old bits back on.
A good mechanic would have tested ignition by pulling the plug out and holding it against the block and watching for a spark. They would also test compression with a compression tester.
[QUOTE = "Aberfal, príspevok: 5580977, člen: 76495"]
Mito 1,4 tb s remapom. Zlyhanie valca 1.
Vyskúšali sme zástrčky (tri sady), nové balíčky cievok, momentálne skúšam ďalšie uzemnenie pre ECU. #
Prosím, pomôžte, pretože používanie môjho miestneho mechanika stojí náklady
How did you solve the problem ? I have the same on my Mito