What's the reason and how to deal with the problem that the system of LIANA car Po 17 1 is too thin (bank 1)? Seek expert answers

Is the mixture too thin? Or is the air inlet too thin? Or is the fuel injection too thin? Or is the correction amount of activated carbon canister too thin? Usually, it should be that the mixture is too thin ... the mixture is too thin: 1 too much intake, 2 too little fuel injection. In this case, it is recommended that you read the fuel injection pulse width, intake pressure and intake pressure signals according to the decoder! And pay attention to the reading when the engine speed is constant (such as idle speed)! Then read whether the oxygen sensor data is normal, high voltage or low voltage! If the data response is not very large ... it is necessary to manually rule out that the fuel injection pulse width is too small and the mixture is too lean, and the intake pressure is too high and the intake mixture is too lean! I think changing the injection pressure can also be tested ... that is, reducing and increasing the injection pressure! And the vacuum pipe is not leaking! And whether the throttle position sensor voltage and throttle position angle are zero at idle speed! Whether the voltage signal of water temperature sensor drifts for too long! Then whether the ignition timing is normal will also affect whether the ignition timing is normal! However, the injection pressure is generally changed manually, and the data displayed by the decoder can be judged after the change! Pay attention to whether the spark plug gap is too large!