How does this happen

[313_S550]

My car randomly began misfiring upon starting, 52k mile 2019 5.0 A10. After swapping the spark plugs everything was good, i’m just wondering how this happens.

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[Snakebyte]

Is that the right length plug? I recently watched the engine master's show and they had a plug they planned to use in a plug comparison trial. They realized when comparing them to the other plugs that it was too long, in spite of what the compatibility chart said.

 

[313_S550]

that’s the factory plug

 

[Snakebyte]

that’s the factory plug

Interesting for sure.

 

[ORRadtech]

Were it me I'd be shoving a borescope into that cylinder and checking the top of the cylinder and valves.

How does Ford install plugs during engine assembly? Is it automated?

Hopefully that's just a faulty plug from the factory and finally wore enough for the gap to affect the spark.

I'd still want to see inside the cylinder.

 

[Torched10]

Were it me I'd be shoving a borescope into that cylinder and checking the top of the cylinder and valves.

How does Ford install plugs during engine assembly? Is it automated?

Hopefully that's just a faulty plug from the factory and finally wore enough for the gap to affect the spark.

I'd still want to see inside the cylinder.

Too rich fuel mixture..oil getting into cylinder.do you see or smell smoke on start up

 

[Mike Pfeifer]

Get a borescope in there and take a real good look for other damage.

 

[GrabberBargeCaptain]

Mods? Tune? E85?

 

[Skye]

I'm going to kind of merge several peoples' interests and questions with my own...

Are you the original owner of the car?

Was that the original, factory plug?

Any mods to the car?

Did the problem begin when you were just putting around, or after you put your foot into it?

It was a Ford/Motorcraft plug. Check. Any chance they'd been replaced before, for 1) something operating at a different temperature range, 2) someone got the part number wrong, 3) dropped, didn't realize they bent the electrode and installed anyway?

If a borescope is immediately available, great; you need to know what the cylinder looks like, yes. If not and you have the hand tools, I'm curious what that specific cylinder's plug looks like now, the new one, if you pulled it today.

 

[Cobra Jet]

As Skye stated above:
Was that plug dropped before installation?

Did you ever do a money shift with the car?

Also it’s been posted on here previously that some have experienced lifter guards disintegrating and flowing through the engine…. See this post for reference and large discussion with images:
https://www.mustang6g.com/forums/threads/found-this-metal-on-my-oil-plug-what-is-this.183969/

That is an extreme example in that thread, but all it takes is for a little bit of metal debris to make it into the cylinder to do any damages to the cylinder walls, piston top/skirts, valves or spark plugs…. That is also not the first post about such an instance…

 

[shogun32]

or you got unlucky with a chunk of carbon.
Though 52k miles before spark plug replacement seems a tad optimistic.

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