Misfire/cat damage - how quick?
Car was running rough, cleaned MAF sensor which I thought helped/fixed. Went on a trip, realised part way through that car was still running rough. I should've turned around there and then, oh well.
Continued on to destination - car is rough going up hills in highest gear but seems ok if you put foot down a bit. No CEL at this point.
Arrive at destination. Do research on phone, figure it's probably ignition coil - car has 4.6l Ford V8.
Two days later, start car to go home - thanksgiving holiday Monday - CEL flashes then goes solid. Silly me didn't realise *flashing* is the worst. Drive home, pull codes - cylinder 7 misfire plus P0316, misfire on start.
Car hasn't moved since but did 230km with CEL on. Again, you don't need to tell me I'm stupid for having driven the car, I've worked that out.
Car's a Crown Vic. Reading around, it seems there will be an O2 sensor code if I'd trashed the catalytic converter - right or wrong? Car was struggling uphill before any CEL came on.
Also, looks like my car has dual dual cats (two pipes, each have two cats) - if I have trashed something, will I likely have only trashed one pair, or both? It's single exhaust pipe if that matters.
New coils are on their way. I guess when I put one in and clear the codes I'll see if I still have low power.
If I don't replace the cats, presumably I can still drive around town? Car doesn't get much use anyway. Any downside to driving it assuming the cat isn't completely clogged?
I don't need to pass an etest, though obviously don't want to pollute. Presumably the non-NY/CA cats will do for here?