1998 opel kadett 20is, car dont want to start, first it happens when it was hot, but know it dont want to start at all..can it be the coil or other electricail problem?

It could be many things. check the link

https://www.google.com/search?q=Opel+Kadette+1.4.+The+timing+set%2C+starts+but+no+revs

An auto electrician with a pro grade scan tool can diagnose in 20 minutes. Better than guessing and replacing the engine!

https://www.google.com/search?q=mobile+auto+electrician+near+me

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Question edited for clarity, spelling and to add maker. Why are you typing in all CAPS, it is rude and considered SHOUTING. Plus it is harder to read.

Your Diktator Management System is a snake oil product. Opel are quite competent at designing and managing your engine. It is supplying more power to the coil in the hope of giving you a better spark. Contact them and ask them what coils the recommend?

https://www.google.com/search?q=DIKTATOR+MANAGEMENT+burns+out+coils

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try cleaning your trottle body

Check out ignition coil and crankcase sensor..

check the timing, improper would cause loss of power and relate to heating. make sure you do not have a brake dragging. Coils (spark generator) often quit when they get hot if going bad. sometimes you can feel if it is heating up excessively by touching it after it is on for awhile. check coolant, oil, and compression for leakage or mixing= head gasket problem.

did you take the distrubuter cap off and check the rotor

the coil most likely blown get a new one and then try testing if will start ,is very problematic and time consuming when a new part like this is going to be a few dollars, then take it from there keep me posted if you wish

Check the tank vent hoses on the filler pipe in the wheel arch, if the show hair cracks replace the lot up and down the tank, very common problem with the Kadett.

do you have coil trigger on either wire to the coil? if so then apply 12 volts to the other wire to see if car will start.