A yellow flame and sooting indicate an incorrect air to gas mix ratio. This can be caused by a number of things including...air/gas mix needs to be adjusted, something such as a spider/web is blocking the mixing chamber/tube, a malfunctioning gas valve, low gas pressure. First thing to do is to check for debris blocking the air mixer/tube. Blow this out with compressed air. Then check to be sure the air mixing tube is adjusted properly. If you do not know how to do the adjustment you may leave this to your dealer. Basically you loosen the screw and slide the thing over one way or another to adjust the amount or air.
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2013 F150 XLT Supercrew EcoBoost
'08 Passport 280BH
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