Do you have a scan tool? What cylinder is misfiring?
Diagnosis is key before spending money. There's plenty of parts to swap around. Only swap 1 part at a time! Find out what cylinder is misfiring. clear the codes. Swap plugs with the cylinder next to it. IF the problem follows the spark plug, then replace the plug. If the misfire stays on the same cylinder, then clear the codes again and swap the coils. IF the problem moves to the other cylinder, then replace the coil. if not, then coils are fine. clear the codes again, pull the fuel rail loose and swap injectors between the problem cylinder and another cylinder. clear codes and run it until it misfires. see if the problem follows the injector or not.
If you are burning up coils, then it many times it's a spark plug that can cause coils to burn out. If the plug has too much resistance, or the gap is too large (worn plugs) then it requires the coil to produce more kv to jump the plug gap, shortening the life of the coil.
It's still cylinder 3? Maybe check your plug wires, sometimes the metal insert gets knocked loose even though it feels like it's on there. Sometimes you can push it down enough to seat, I had to get new wires in my case
I don't think it was the coil then, i'd bet that was just a coincidence. Time to look elsewhere. If it ran for a couple days before misfiring again, possibly a coil. But a new coil frying within minutes is unlikely. That's really not even enough time for it to warm up.
Run the car and let it misfire for a few minutes. Then immediately pull the spark plug out and inspect. See if the spark plug is wet? Dry?
I'm suspecting an injector has or is failing. I know how some like to say these coils go bad left and right but I sold my car with 270k miles on it, still all of the original coils and wires and I never had a problem with them so I'm still not completely sold that the coils are junk...
Well i switched the coils and it jumped from 3 to 4. And I did the 626 valve cover swap so I'm running protege coils. It was running fine for 5 months before this happened.
I swapped plugs and wires still the same coil. I put it new coil same problem. So I'm wondering what's making the coil go bad.
black spark plug is usually an indicator of a weak spark, or running way too rich.
Since you've got the same problem with new coil I'm thinking the injector is probably stuck or sticking (it can be intermittent) and it's fouling out the plug.
I'm not familiar with the swap, how hard is it to do? Would it be a real PITA to swap back to the original setup, at least to test and see? Also, what are your plugs gapped at? And do they require a different gap with the coil conversion?
Of curiosity, what do you gain from the coil conversion?
The misfire did follow the coil but something has to be burning the coil out. So it might be that my jet is stuck open and the coil can't keep up the stress from the fuel maybe. I don't know I'll find out when I get the new injector. I still have the other coils to send back she I'll take off the extra one.
ZFR5F-11 these are the plugs in using.