Have you checked the injection pressure in the multiple ??? It should not exceed 2.5 to 2.7 kg/cm2.
If the pressure were too high, with the same time of opening of injectors, more flow is supplied than necessary = high co (greater than 0.4)
and to the Lambda value greater than 1 volt.
In this case, the fault light would be turned on due to Lambda probe failure, (O2 sensor in the exhaust gas) since the switchboard
tries The injector multiple (injection ramp), at normal atmospheric pressure should be around 2.5 kg/cm2 but when subjecting it to a suction greater than 0.5 atms the injection pressure must fall to 0.2 to 0.5 kg/cm2.
To check it, put a pressure gauge on the injectors multiple, put the contact without starting the vehicle for two seconds, the pump supplies gasoline under pressure and the needle rises to the aforementioned value.
Then proceed to disconnect the tube located between the regulator and the admission multiple and exert emptiness in the tube while the operation is repeated. The value will be in this case 0.2 to 0.5 kg/cm2.
If blowing pressure is exerted in the aforementioned tube, the pressure increases even more to 3.5kg/cm2 which is the maximum that the pump supplies.
If this regulator was correct, it would be necessary to think about the probe that measures the mass of air that enters the engine. (That he was measuring more)
Flower or defective atmospheric pressure sensor.
I hope I have helped you.
Receive a cordial greeting.