My car works normal, normal revolutions, oxygen sensor responds well, the temperature sensor marks the temperature correctly, it does not have vacuum or compression leaks. The problem is that it does not make the ideal air / fuel ratio 14.7 - 1 and uses a lot of gasoline.
I have scanned and I have no error code, no check engine light on the dash. The oxygen sensor is oscillating in rich mixture (0.89v) but I have checked it by making it a controlled vacuum leak and it drops to (0.1v)
I don't know what it could be. If someone has happened to him or if normally the Chevrolet lumina 97 is like that. Please inform me of any clues here. Thanks

 

Welcome to the forum. You need to post your question in the Lumina section of the Forum where you will get more views as this is the welcome new members section.

 

I'd suspect the MAP sensor.

 

That makes 2 , of possible malfunctioning MAP sensor.

 

Hi hanky. I show you a reading of the map sensor together with the RPM and the bank 1 oxygen sensor before the cat.

Rpm and O2 sensor 01 Bank 1.

Maf and Map sensors.

 

[QUOTE = pañuelo; 463761] Eso hace 2, de un posible mal funcionamiento del sensor MAP. [/ QUOTE]

[QUOTE = kevinkpk; 463749] Sospecho que el sensor MAP. [/ QUOTE]
I scan the car and I have seen the map working and it seems to me that it is working well. I would not know if they are erratic values ​​or the correct ones. there I sent a capture of the graphs map, maf, rpm and O2 sensor.