Ford Explorer – (Fancey Media / Shutterstock) The most common signs of bad O2 sensor in Ford Explorer are slow acceleration, loss of power, irregular idling, engine hesitation or jerking when accelerating, high fuel consumption, higher tailpipe emissions, foul odor from exhaust, check engine light illuminates, and sometimes stalling.
Here’s a recent update from a Ford mechanic on just why Ford’s 4-cylinder EcoBoost engines are failing car owners and shows what you need to look for when buying a used 4-cylinder Ford. Posted
Take the average of your highest readers (in this case cyl 1 through 4 =175psi), multiply by .10 (18psi) and subtract from the average (157psi). if your lower numbers are less than that you are looking at a bad cylinder (s). Well at least that is how I do it. Edit: Correct difference is 10% not 20%.
JLUY1M.