Spark Plug lasted 30 days

[WaltZ]

I changed out the plugs (Autolite HT1 Platinums) and coils a month ago.

Last week I noticed a hesitation (misfire) around 55 mph, but no CEL. Well, the CEL started blinking yesterday, so I was able to get a code. Misfire cylinder 1.

Pulled the coil and it was really sooty. Pulled the plug and it was worse and without an electrode.

Has anyone had a new plug distruct in that short of time? Is there something that's perhaps causing this, internally?

 

[dacaur2]

Does it look like the electrode melted or broke off? either is possible. Are you sure they were the correct heat range?

 

[WaltZ]

broke off. jagged edge where they were connected

 

[dacaur2]

Some possibilities... A defect in manufacturing, which would be the best case scenario, or the piston hit it, which is unlikely, or perhaps a faulty injector is causing a lean condition in that cylinder overheating it and causing pre-detonation.... Have you looked at all the other plugs? they look normal?

 

[WaltZ]

I pulled cyl 2 and it looked fine.

The guy at O'Reillys thought it could be a defect as well. He was more amazed at how the plug is designed

 

[Mbrooks420]

I’d replace them all with standard replacement Motorcraft parts. Pull it again in a few hundred miles. Might be worth a compression check if you have access to a tester.