Chevrolet Optra has me crazy

Greetings Jotaele, have you tested with the scanner of monitoring the sensors with the vehicle walking? Thus you can observe their behavior in operation, and if you have option to register and graph better (for example, the Scantool software), petarders can be a defective MAP in a certain regime, as well as a defective temperature sensor, if you can perform the test and warn us if you find something or if you have any questions with the operating ranges. Greetings and luck.

Check the ECU wiring, it has many different failures, it may be the information that comes from the sensors is not correct, or the exit to the actuators, measure the sensors before changing them, check the mass connections and the reference voltages and the real measure Yeah.

Regarding your question, I tilted with the MAP, try another one get a car and you have the change to try, in the vehicles with Flujometer makes that symptom that you tell me and it is the FLOW THE CULPABLE.

Cordial greeting.
If you allow me to comment on the subject I think that if the Scanner does not report any code now and the Check Engine light does not turn on it is no longer a sensor problem, I would choose to check the fuel circuit, from the fuel pump, it is possible that it is failing or possibly it can be the pressure regulator, I recommend you perform the tests with a pressure pressure gauge, I hope it serves you.

Hello if possible, try to get a multiple of admission (in the bird some models was disarmed inside) and the other tried without the catalyst in one of those is covered and you are struck that the gases do not come out and luck