2014 Ford F-150: misfire or rough idle

Filed Dec 22, 2025 · Engine · IN

Coil packs need constant changing in this vehicle. I’ve owned it almost 8 years and sometimes I would have to change the coil packs more than 1 time a year. Obviously I would change the spark plugs also. But there is always a misfire. A lot with 3 and 5.

Filed Sep 27, 2024 · Acceleration, Engine · MN

Driving at highway speed, went to accelerate and pass another vehicle on a four-lane highway with my vehicle ending up in the far left lane attempting to pass. Truck lost all power, began to shake violently like it was misfiring, got an illuminated wrench on my dashboard, and at that point began to coast with no power being supplied by the engine. Miraculously I was able to coast across three lanes of highway to the shoulder without being rear ended by traffic moving at 70 mph which would have resulted in a catastrophic accident (endangering myself and my family and others on the road that day). I shut the vehicle off to stop the engine from shaking and misfiring and let it sit about two minutes. I restarted the vehicle, the illuminated wrench went away and the truck idled as normal allowing me to drive another 25 highway miles to my home without incident. Had a mechanic put a diagnostic tool on my truck to see if any error codes were thrown from it which no codes were present. Have taken it to Ford dealership near my home, they have been trying replicate the condition for three days and have been unsuccessful. Their hunch is throttle body assembly needs to be replaced ($675 fix). Quick query of NHTSB reported incidents shows a growing quantifiable history for the Ford F150 3.5L Ecoboost experiencing the exact encounter I had on this day. My family and I along with others on the highway were fortunate the event didn't end up tragically that day. Ford - time to step up and rectify via recall.

Filed Jun 27, 2024 · Acceleration, Transmission · UT

I was driving 70mph in the middle lane on the highway and all of a sudden it down shifted resulting in my rear end locking up. I had my three children in the vehicle and the truck gave me no warning signs. I was fishtailing and was extremely lucky we didn’t crash and I was able to gain control of the vehicle again. I took it to the mechanics shop and they told me it was the p0720 output speed censor circuit malfunction and this was causing misfires in my engine as well in cylinder 7 because of the problem in my transmission. I haven’t drove the truck since because I can’t afford to fix a transmission and engine.

Filed Feb 9, 2023 · Acceleration, Electrical · AZ

This began in November of 2022 as an Intermittent concern. At first, it appeared that I could temporally correct by pulling over completely shutting off the truck and re-starting (re-booting) but is rapidly becoming worse and today (02/09/2023) became untenable, no matter what I did; the speedometer would not work or behaved erratically for brief periods; the information center display disappeared and then became dashes; the transmission randomly down-shits gears causing the wheels to lock up briefly or does not shift at all, causing engine RPMs to spike. While thankfully this has only occurred at speeds below 40 MPH, I feel that this is a safety concern for myself and others as operation of my vehicle becomes haphazard and unpredictable and I am very concerned that it may happen at higher speeds causing a crash. While I have not had the "wrench" displayed, I have read the following codes: U0401 INVALID DATA RECEIVED FROM ECM/PCM; P0316 MISFIRE AT START; P0722 OUTPUT SPEED SHAFT SENSOR The local dealer sates that he believes it to be a Molded Lead Frame issue that was recalled in previous F-150 models but as mine was a 2014, it was not covered. Obviously, the problem has not been resolved for subsequent models.Additionally, the needed replacement part is unavailable and on indefinite back-order, or as the dealer put it, on "inter-galactic back-order" So now, I have an expensive paper weight in my driveway, waiting for a part that may be months or even up to a year to arrive.

Filed Dec 1, 2021 · Acceleration · VA

Since my truck was new I have had a problem with no acceleration, misfire, brakes, and some kind of growling noise when I come to a stop and or making right-hand turns. Just after my warranty expired I was driving on the highway and I had to slow down my truck cut off. Today it cut off in traffic 4 times, this isn't very safe. I pulled the codes and it was a P2112 throttle actuator closed. I saw on a web page that Ford extended the warranty on this issue to 10 years or 150,000 miles, I called Ford and they said that they will only charge me to fix this problem.

Filed Mar 6, 2021 · Transmission · 145,000 miles · TX

While traveling northbound on hwy 90 by chimneyrock exit my truck suddenly and abruptly downshifted to 1st, 2nd, 1st and 3rd. Had to oull over and started going again. Now it gets stuck in third and is making one of the cylinders misfire.

Filed May 28, 2019 · Engine · 75,000 miles · CO

Tl* the contact owns a 2014 ford f-150. While driving various speeds, the vehicle misfired without warning. The contact stated that the failure was due to the eco boost. Also, the check engine warning indicator illuminated. Red rock nissan (2582 us-50, grand junction, co 81501, (970) 644-8020) diagnosed and repaired the vehicle. The contact was unaware of the diagnostic and repair specifics. The manufacturer was made aware of the failure. The failure mileage was 75,000.

Filed Apr 8, 2019 · Fuel system, Visibility · 65,000 miles · NC

January 11, 2019 my eco boost fx4 was just at 65k on the odometer experienced a hard shutter like many on the forums say and wouldn't accelerate on the interstate. Code came up misfire. Replaced all my spark plugs, that aren't suggested for change for change until 100k. Gap opened from .28 to .45. Intercooler had a good bit of oily residue in it. I also since then installed a vapor catch can for over 400$. It's a shame you have to do that. Also I recently had my rear defrost on the stop working on the model with the rear sliding window. Which again has many complaints. Fords fix is to replace the whole rear window at a heavy price. Box being able to defrost is a major visibility issue especially in the winter. Both issues have many complaint online and ford hasn't fixed either. The picture of the coke bottle is what drained out of the catch can by npr. It was 1 month of commuting and a 8 hour road trip.

Filed Dec 2, 2018 · Engine · 99,000 miles · SC

Having lots of problems with misfires. Engine shakes and shutters during idle. If I try to pass a car on highway the truck will go iino a severe shake and then will not accelerate. Goes into limp mode and engine light comes on. Have to pull over and shut the truck down for a couple of minutes and then start back up. This is a constant problem. More pronounced during rainy days. Have replace coil packs spark plugs map sensors and still have not solved problem.

Filed May 13, 2018 · Fuel system · 65,500 miles · NM

3 times this has happened, 1st time I had just filled up went to pull off and proceeded to get on highway, truck started to run rough and had no throttle response and wrench light came on. Pulled off road, turned off, after a few minutes restarted truck and no problems the rest of the day. The 2nd time I was getting ready to get on the interstate and truck did the same thing started running rough, no throttle response and wrench light came on again. Pulled on shoulder and shut vehicle off, restarted after a few minutes again after the restart no problems ( no check engine light either time). Then on the same evening it did it again and in traffic this time and with no where to pull over. Ford knows about the problem, every ford forum talks about the problem especially when it comes to the ecoboost. Someone is going to get killed with this problem. Took vehicle to dealer and there was a tsb to relocate the fuel pump driver fuse because they say it gets hot and shorts out( if that's the case it shouldn't do it right after initial start up). Again ford is playing with people's lives; all they care about is the dollars. .

Filed May 24, 2016 · Engine, Transmission · 15,830 miles · AZ

3.5 eco boost engine runs rough at times and when passing at highway speeds sometimes goes into "safe mode" and shuts down to idle when under full acceleration. Mileage is constantly going down, from 22mpg to 13mpg. Dealer says this is new to them.the dealer said they found tracks on the spark plugs and changed them, new plug wires were supposedly bad, replaced both turbos. Still no difference.I have a video of this happening with the eng check light coming on and after the dealer said there was no indication of this in obd2 memory.

Filed Aug 12, 2015 · Transmission · 17,000 miles · AZ

I have been having problems with the engine and brakes since I bought this truck. I have had it to the dealer numerous times and they throw parts at it and it does not fix it. At beginning of acceleration there is a dead spot in the throttle and when you push past it slightly you find the vehicle accelerates rapidly and sometimes spins the drive tires. A few days ago I was pulling out into a break in traffic that was more than adequate and the engine started o.k. Then hesitated putting me in danger of being hit by now closely approaching traffic. When I bring the truck to the dealer they try their best to find the problem but can't.they said it was bad turbos and replaced them that did nothing to help, they also said the plug wire boots had tracks on them and the spark plugs were misfiring, all was replaced to no avail. Also when you are driving at city speeds and push the throttle to pass or accelerate in traffic there is a noticeable lag in depressing the throttle and the engine responding. This is also a dangerous problem.I brought the truck in for overly sensitive brakes and I was told by one service writer that the tech found fluid in the booster and another writer said it was assembly lube. They changed the booster but not the master cylinder.