Update: There's a follow up video where cleaning the fuel injectors improves this condition further:
• DIY Fuel Injector clea...
Diagnostic Trouble Codes (DTC) often don't trip until issues have reached a critical stage.
Reviewing the Live Data from your scan tool -- in my case, XTool D7 -- will allow you to spot issues early in their development. Here, I am catching that my 2015 Ford Expedition 3.5L Ecoboost is running rich. Realizing this lets me evaluate all the potential causes of air/fuel mixture issues and work through a sequence to get my Long Term Fuel Trim back inside an acceptable range.
I didn't get all the way to where I want to be in this video, but I will follow up in a week or two as efforts continue.
Негізгі бет DIY MAP sensor cleaning -- using XTool D7 to identify and correct Long Term Fuel Trim issue
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