Misfire Issue help!

[TOXIC_S650]

So been driving my 2024 GT Premium for over a year and a half, no issues. It had about 3700 miles and I installed a new racing clutch and short throw shifter last month in preparation for my supercharger install coming up later this month. After these two were put in, my car shakes in first gear and my engine light flashes. Took it back to ford and they said its due to a 4 and 7 cylinder misfire. After diagnosing, they said due to the misfires, the engine is putting itself into 4 cylinder mode which will cause shaking. It's definitely running on 4 cylinders because all of my power is gone. Its been a month and a half and they said there is nothing they can do, but the supercharger tune will fix it so not to worry about it. Was never a problem before I installed the new clutch and shifter. Anyone heard of this and have any suggestions? Will the supercharger tune fix it? Thanks.

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[robvas]

4 cylinder mode?

 

[S650sunshine]

So been driving my 2024 GT Premium for over a year and a half, no issues. It had about 3700 miles and I installed a new racing clutch and short throw shifter last month in preparation for my supercharger install coming up later this month. After these two were put in, my car shakes in first gear and my engine light flashes. Took it back to ford and they said its due to a 4 and 7 cylinder misfire. After diagnosing, they said due to the misfires, the engine is putting itself into 4 cylinder mode which will cause shaking. It's definitely running on 4 cylinders because all of my power is gone. Its been a month and a half and they said there is nothing they can do, but the supercharger tune will fix it so not to worry about it. Was never a problem before I installed the new clutch and shifter. Anyone heard of this and have any suggestions? Will the supercharger tune fix it? Thanks.

Idk if ford telling the truth with the 4 cylinder mode thing. Did you install the mods yourself? Idk this issue tbh.

 

[dusman59]

Do you need to do a crank shaft relearn? I know this was almost needed on earlier Mustangs when installing a new clutch.

 

[MAT1955]

Start with the fact that you changed the car that was running fine and work out who did what to your Mustang.

 

[dusman59]

You definitely need a relearn. Missfires and limp mode happen when the crank sensor is disturbed.

 

[Q6543]

First thing I’d do is pull your spark plugs and re gap them down to 25 thou…

super common in the past if it’s happening in higher rpm/boost… spark blowout from bad gapping… causes misfire

 

[dusman59]

You might be right if he had force induction installed. He installed a new clutch. Wipple coming soon.

 

[roket]

my dealer just had a supercharged 2024 come in with a misfire on one cylinder, turns out the spark plug on that cylinder was absolutely gapped too much. check your spark plugs, especially the problematic ones, and ensure the gap is appropriate. i also misread your original post, but i will keep this here.

now that i re-read your post, try doing a Kam reset. Kam is keep-alive memory, and is in charge of remembering basically the conditions to detect a misfire as well as certain timings for ignition. it could be setting a false positive, or you could have an actual misfire, either one could be caused by a sudden change in engine response, like swapping out a clutch

about that "4 cylinders" thing, maybe its just me, but that doesnt sound right. i know Ford has a feature where an engine will run on alternating cylinders if the coolant is over temp, but there is another possible cause. a cross-plane V8 is already not fantastic in balance, but having staggered cylinders like 4 and 7 misfire sounds like it can definitely cause shaking like that, and the engine mounts are not designed to damp that degree of shaking. i will disclaim that the second part about engine balance may be wrong, but it sounds right to me based on what i do know. if someone reading this knows i am wrong, please correct me

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