2013 F150 Limited. 90k Miles. 3.5L New to me.
Have had the truck for about a month now and it has (and does) run just fine. Until today.
Today I was getting on the expressway and put the accelerator to the floor. The truck immediately began to misfire rather badly and the check engine light flashed on and off.
Backed off the accelerator and the misfire and check engine light went away. Drove to my destination just fine.
On my way back, I decided to see if the misfire would happen again if I put the pedal to the floor. Sure enough, not only did it misfire, but it began to vibrate excessively. This time the check engine
light came on and has stayed on. Backed off the speed and the vibration subsided. Made it home and turned the truck off. Tried to restart it and it started just fine. Engine light still on.
Am going to take it to the dealer tomorrow and have it check out, but does anyone have any idea what might be going on?

 

Most engines with a miss fire you would blame the coils..

The 3.5 turbo engine is a little different. If is DIRECT INJECTION for the fuel. The Fuel pump is driven off the motor and is a high pressure unit. Pump wear can cause loss of pressure.

Another problem I have read about is condensation getting into the air intake systems in very humid weather. The water collects at the low point of the system which is the air cooler tubing infront of the radiator. This causes water to get sucked into the combustion chamber as the turbos crank up at high load.......... I will try to post a youtube video.

 

https://www.youtube.com/watch?v=fF6M66dOxps

this is the condensation problem

 

Look up intercooler weep hole. Drill it, be done with what you describe.

Ford had it's hand tied by the EPA and had to make a completely closed system.

 

Well with 90k you probably have another issue. The plugs and coil boots need to be changed by 60k miles. On the EcoBoost you must change coil boots and plugs the boots are not optional and will lead to carbon tracking and misfires. Don't continue driving with a misfire unless you want to ruin the catalyst system. As suggested above drill the weep hole also.

 

At 61,000 miles my truck did exactly as you have described to the TEE.

Six new plugs and boots, problem solved. I then drilled the weep hole for good measure, no issues and complete confidence that I'm not ingesting any moisture into the system.

At 68,000 miles I needed the #2 coil replaced.

I'm now at 89,000 miles and no issues.

 

Thanks to all that responded and the awesome video. Took it in to the Ford dealership.
Here is what they did. 6 plugs. Coil pack. Reprogram PCM. Cleared KAM. Fuel injectors cleaned. Cooling system flush.
The last 2 were at my request. $944.01 later and all seems good.

P.S. Did the weep hole thing also. So, will it always drip oil?

 

drip oil...... probably... This is a LOW POINT DRAIN tied into the PCV system.. any blowby or turbo seal leakage will end up in the intake system at this low point...... Many have said the oil will deposit on the intake valves and can cause problems.. The hole helps reduce the oil that is burned on the valves.

If you don't think that is your problem, you can get a VERY SMALL screw and plug the hole.

 

Yeah, was wondering about plugging the hole back up. Thought I might let it drain for a few days then close the hole. Don't really know.