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Monte Carlo & LuminaSince the 1970s, the Monte Carlo has been an icon of American stock car racing. A 4-door version, the Lumina, was produced in the late 90's. Platform: A-, G-, & W-body
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
here I uploaded some screenshots of the graphs that CamScanner threw.
My car's fuel system gets stuck in open loop
