My 2015 F150 3.5 132k, has a weird shutter/ engine lug. I’ve changed the plugs & did a transmission flush.This only happens seemingly in 3-5th gear, at a low RPM with light throttle. When this occurs I run a mode 6 on it to where it shows 2-5 misfires on 3 cylinders most of the time . When I don’t notice the shutter , shows no misfires. I can almost do it on demand lol. Has anyone had this happen? Or know of a fix? Thanks in advance .

 

I can make mine shutter on demand. Low speed, light throttle and it will do it. 1100 RPM is the most pronounced.

 

about the same for me. Do you know of any solution ?

 

None I have found.... Grease monkeys at the stealership said they could not re-create the issue and refused to take a ride with me so I could show them.

A slight incline (load) adds to the stutter.

 

dang.. so do you just deal with it and try to prevent it at much as possible? I know driving in sport mode helps but that’s also driving in sport mode lol

 

I just live with it. Does not happen when in Tow Haul mode. I have no need for Sport so can't tell u if that helps.

 

Sounds almost exactly like my torque converter shutter that I had.

 

@mcr1911 you had? How did you fix if you don't mind? Thanks

 

yeah I’ve read some forums about that; however it dosent happen at the speeds people claim it happens (40-65) . I obviously don’t want to replace it if that’s the case . Hopping it’s just a misfire issue as it dosent happen when the RPMS are greater (sport mode or lower gear ) also shows mode 6 misfire when I notice it, I go home and check it lol. How did you fix your issue? Were there any other signs?
thanks in advance.

 

I'd check your coil packs. Mine was doing the same thing in 3-4 gear, sometimes in 5th. Under some load while giving it throttle it would sputter really bad. Had the dealer check it out and they diagnosed it as a bad coil. Had them replace it, and no more sputter