lean or rich

Hello everyone, how's it going? I am having an issue that triggers check engine light with p0171 code. (System too lean bank1) When I did a visual inspection under the hood I found an unplugged vacuum hose in the back of the left side of the engine. (see: attached image) I wonder if any of you...

Hi, I'm tryin to understand the relationship between lambda values, MAF values and its related injection on time. As a rough calculation A/F ration is calculated as (100*Inj period[ms] *RPM)/120000 So if MAF values are low inecjor times would therefore would be low in proportion, which...