Sentra 2002 Starter Problem

I have a 2002 Nissann Sentra, for 10 years I did not give me any problem but already in 200,000 km, I started having problems just to start, in cold weather it is aggravated, it already takes it with 3 mechanics and does not mark any failure of any sensor or computer, it can be something of the engine, and walk in car does not fail.

Send the sensors, CKP and CMP, that are the starting sensors, but that check them with oscilloscope that is the most present way to do so.

Usually cold starting problems are ocacación by the motor temperature sensor or the crankshaft position sensor. On occasions the computer does not detect them as failure because they work but out of rank.