Well i was driving and my truck went into engine fail safe mode so i pulled of to the shoulder turned the engine off for about 15 min. Started it back up and is runinng like normal again,any ideas why this happend.
Truck is an 05 4x4 5.4 supercrew with 72k miles.
Thanks on any info.

 

I had that happen to me twice in the past, in my 2008 F150. The first time the MAFS (Mass Air Flow Sensor) was bad, the second time for some reason or another a fuse, under the passenger's side, had blown.

From my experience, I'd say, check your fuses, if all of them are good, if or when it happens again replace your MAFS.

Or, better yet, purchase yourself a code reader, once you've gain access of the engine trouble-codes, then you can first use the search feature here at F150online and only when you've exhausted yourself from using the search button without success, then you can post those codes and I'm sure there will plenty of member who will guide your in the right direction to solve the problem.

MAFS

 

Cleaning the throttle body should also be done....a dirty one can cause a fsm also...

 

Clean the MAF sensor and throttle body. Your TPS sensor (throttle position sensor) may also need replacing. My truck used to do this every couple of months for no apparent reason.

 

Thanks alot to everyone for comments will defenetley clean my maf and tb,truck is runing good now.

 

Mine went into FSM and had to be reflashed by Ford They told me that it was my edge programmer and Edge sent me a new programmer and paid for the reflash.

 

Mine did it. It was a dirty throttle body. Cleaned it and all is great again.