eldarroch

My husband has a 2012 F150. It is lifted (don't know if this makes any difference). We have been experiencing the following issues with the car, and have taken it to multiple mechanics trying to figure out what is the source of the issue. We have replaced the O2 sensor as well as the throttle body and nothing has improved. The mechanics seem to be out of ideas or they are completely unable to find anything wrong.

-During warm weather, the check engine light turns on for a day or two and then turns itself off - this does NOT happen during cold weather. When we took it to a mechanic, he said that the code indicated it was an O2 sensor issue which is why we replaced the O2 sensor but it didn't stop the check engine light from randomly turning on.
-During cold weather, the engine cranks repeatedly before starting though it does eventually start - this does NOT happen during warm weather.
-The radio/GPS will sometimes not turn on unless the car is turned off and turned back on again.
-It feels as if the car is chugging sometimes.
-At high speeds, there is a faint rattle sound.
-Most recently, the engine has begun to stall while the car is driving with increased frequency. Once my husband gets to the side of the road, he is able to start the car back up again. When this starting happening, we were told to replace the throttle body (which we did yesterday) but then this morning the car sputtered to start and his engine stalled out before he even got on the highway to go to work.

Please offer any advice! We are pouring money into this trying to figure it out.

DarrinT04

it still sounds like an O2 sensor issue. check and make sure it is on right. also the truck has more than one O2 sensor

eldarroch

I will definitely look into that. Thanks for the advice!

5.0nly

eldarroch

Spiky

That seems like an important fact. Did all these mechanics know about that? Perhaps that sensor is bad.

Standard 5.0 issues to check:

eldarroch

The stalling just began happening about a week and a half ago, but the mechanics we have seen since then have been notified of that.
I will absolutely have my husband investigate the fuse. There are definitely a few aftermarket things that have been done to the truck, and I've wondered if they were done incorrectly by a previous owner. Thanks so much for this advice - it's good to have a few things to pass along to the mechanics when we drop it back off on Thursday.

ceejayegee

To the O.P. does the truck stall while driving or at an idle I.e. like at a stop "red" light? Weather was not a factor for my vehicle. I had an issue with my 2012 where it would stall at a stop light during idling. I noticed my truck would begin idling rough at stop lights then eventually flat out stall after the next few traffic lights. I'm in Houston, TX so I can't go anywhere without driving through two dozen traffic lights. When my truck stalled I would throw it in park, turn key to off position, and then crank the engine and voila it would immediately start. So, I tried cleaning my air filter, MAF sensor, and throttle body (none of which stopped the stalling) so before I resorted to buying a new throttle body I did some research and found my issue to be a bad vapor air canister purge valve.

There's plenty of videos out there about F150s stalling but this fix worked for me and I hope it helps you. Since I changed out the part I've driven over 2500 miles with no issues nor even any rough idling. Links below:

I used this video for reference. My part looked like the 2nd (Amazon) link.

(check fitment for your truck before buying)

Just thought I would ask and share my experiences. Apologies for the absence....

Lee308

Check fuse 27 issues.
its common, should be a recall.

MustangAndy

Should be, but it's not - just like the 5.4 plug spitter.



OP for your reference here's a quick note on fuse 27:

https://www.f150forum.com/f3/first-f...5/#post6245385



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