I have a 2011 F250 SD with the 6.2L gas engine. Yesterday I stepped on the gas to pass someone. Everything was fine for about a mile or 2 when the motor lost power and started “chugging” really bad. The little wrench light showed up on the dash.
I pulled over and opened the hood and saw that a hose had come off of the intake tube. (It has K&N CAI I installed when the truck was new.)
I plugged the hose back in but that did not make a difference.

The truck would barely crawl in gear. I had no tools with me and nothing was around but thankfully I had a cell signal so I started researching.
It appears that my MAF sensor has gone bad. I unplugged it and the engine got power. I plugged it back in and it fell on its face.
I unplugged it and drove it the remaining 15 miles home.

Has anyone else had something like this happen? Where did you buy your MAF sensor? I see them on rock auto from $23 to $105. The highest priced one being motorcraft. I’m guessing most all of them originate in China, Japan or Mexico.

Any idea what would cause the hose to blow off? Would a failed MAF sensor cause pressure buildup in the air tube between MAF and throttle body?

Any recommendations on which brand and where to buy?

 

Did you pull the code? Id do more diagnostics before buying a new MAF. Also, most people will clean them first. Get specific MAF cleaner and let it dry completely before firing up.
If it does turn out to be bad, Ford OEM or Motocraft for sure.

 

have not checked the code yet. I am doing a plug and wire install this weekend and figured I would pull the throttle body and clean it as well.

Good idea to check code and clean sensor first. Thanks!

 

Clogged catalytic converter?

 

If you unplugged the MAF and the truck picked power back up, then the MAF is malfunctioning, whether it be dirty or just plain bad. The reason it picked back up is because the computer started running off the default tables in the computer instead of relying on the sensor's input. Your description is CLASSIC MAF failure.

That said, still a good idea to pull the codes and confirm.

You can try cleaning it but I've never had good luck with it. I find it easier to just replace it. As said above, definitely get an OEM/Motorcraft part - these trucks do not typically react well to aftermarket electrical components, but seem to be quite happy with OEM/Motorcraft ones.

 

Sounds like you got it figured out

 

This!

Unplug your MAF if you suspect it is defective. You’ll throw a code, but if the engine runs better you have found an issue.

 

Check to see if you k&n filter is an “oiled” filter.


i used an oil filter in my truck and the MAF sensor crapped out. Had oil film all over it. Tried cleaning it but still no good.

 

Yeah, you can't run a K&N filter right out of the box, and you definitely can't follow their 're-oiling' instructions.

I've run them on several vehicles in the past, but on every one of them I've had to clean the filter completely when I first unpack it, let it dry, then (I prefer to use the aerosol style oil applicator) spray it lightly until it just turns slightly pink. Don't go for the dark pink/red they claim - that is a SURE FIRE way to ruin a MAF sensor. If it is a very light pink, it will filter just fine but won't release any extra oil and ruin a MAF sensor. I went through more than I'd have liked before I figured this out years ago.

Of course, anymore I don't even bother with aftermarket filters since I'm not as into pumping up my vehicles anymore - the stockers on modern vehicles flow MORE than enough air for even light modifications. You've got to be moving a LOT of air to need anything else.

 

had same issue on mine. Bad MAF but no code. Unfortunately I had no internet so had it towed. Ouch! Reseaerhed once home and found out it could be unplugged and run