Mercedes Sprinter 316 CDI

I have a 316 CDI sprinter that starts when you want, it doesn't even move the starter engine and after a while it is heard as if something is released, and starts.
I have been going to Mercedes (Itarsa) and after changing a lot of things, because I have been many times, the wiring, the battery ... etc, and after putting the van in the happy computer many times, I continue with the same problem.
Before they blamed the anti -theft, but now he no longer has.
Anyway, Mercedes has been dizzy for several years, and has not solved the problem.
You could give me an idea of ​​what it can be, or from a confidence workshop in Madrid, which not only dedicates to change pieces, to see if ......, and I solve it at once.
It usually starts, but once it is hot I can stop to throw gas oil and be thrown into the gas station, until you want to start.
By the way if I pushed it a povo immediately starts.

THANK YOU:(

Hello,

I understand that it only fails when it is hot, right? Then it is prove that it has to do with the march, r respectively its components. When you do not want to start, try to bridge the march directly, with the open and speed switch. If this begins to turn the march then you have a problem in the wiring, the connections, relay or the switch. If the march does not work in this way, then it is an internal failure. Then you have to check, among other things, reinforcement (rotor) and cross -spot by short or open (high resistance). You have to do this when the march is hot. With home media you achieve it by heating the pieces in an oven up to at least 80 degrees Celsius and testing then with a multimeter. I hope the information helps you, greetings Jürgen.