Hi everybody!!! HEEEEELP!
Hello to everyone in this forum.

I need some help with my '05 Mazda 3 Sport Wagon. I replaced the sprk plugs and used Bosch Fusion Iridium plugs.
I changed them last Friday. Today, The car activated the Check engine warning while driving at 67 mph. Funny thing: the car was not rough revving, no peculiar noise, no loss of power; nothing. I got a diagnostics code P0300- random cylinder misfire. WTH? can anyone tell me what's up with that?

Your input will be well appreciated.

 

put the old plugs back in, bosch sux ngk's are better, make sure that the thread length is the same

 

It is. and the car is running smoothly, so I don't understand where the code came from. Also I ised the car a while ago and the code has not popped up yet. Any ideas?

 

random cyl misfires are a pain to daig, there may be nothing wrong at all, but a simple "glitch" may trip the cel for it, there isnt really a way to just pinpoint w/o using mazdas code reader it may even involve a reflash of your ecu.