Re:Re:Re:Re:2010 Ford random misfire engine barely runs 02 sensors flag evening condition

2010 Ford 5.4 triton, Upstream sensors are a wide band and downstream are narrow band I have to be sitting there WOT to keep it running watching my upstream and downstream both indicate fully lean Wide bane o2 2.5 @ wot downstream are at .02 Indicating super lean

My fuel pressure at the rail is 50 psi koeo ,60 psi koer
When the truck does manage to go to closed loop the LT trims Are maxed out high but the system keeps forcing into open loop Not sure where to go from here.....


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Does anybody know Can anybody help?

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Unfortunately, I can't make out the pictures of the codes you posted.
Did you check it for a vacuum leak?
I remember a great big rubber elbow in the back of the intake nearly impossible to reach on some of the 5.4l engines that would come apart (or be left off :blush: :blush: :blush: ), and the truck will barely idle.

Oh Hey Noah, The truck does barely idle let me try to re post those pictures

R checks for a vacuum leak using brake cleaner I couldn't find my propane at the time and we don't have a smoke machine

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Let me know if you can see these pictures, I suspect a huge vacuum as well

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Pictures suck P2195 P2197

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Thank you for posting the pictures again. If it is a big leak, a smoke machine would be the quickest way to find it.

This is the vacuum port that I have struggled with in the past. Yours is newer so that may or may not be there.

Well I believe I found my problem mass air flow sensor, at 200 rpm,ram, its reading 50 gm/s lol I knew I had a super lean issue the engine thinks there's a whole lot more air coming in then there actually is
If I snap the throttle the gm/s shoots up to over 100

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200 RPM? That thing really is running like crap. That's about cranking speed...
Be sure to let us know if the MAF fixes it.

Found a piece of grass that was stuck to one of the hot wires inside of the MAF Once I pulled it out problem solved truck runs excellent and my short term fuel trim went into the negative to correct the long term

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grass in maf

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Nice find! Good job