I just did a little preventative maintenance. It seems like a lot of folks are having problems with their coils and/or plug wires at around 50,000-60,000 miles. Im at 56,000 miles so I thought Id replace mine. the coils were only $18 apiece on autozone's website. No one stocks them, I dont think my local mazda dealer even had them, they had to order them for like $30 each or something, the wires at the dealership were like $60 I think. The prices were even higher at other parts stores. I got both coils and wires shipped for $81....better than being stranded with bad misfiring and having to wait days for coils to be shipped in for big bucks.
I checked my plugs while I was at it and they were unusually clean. They have about 10,000 miles on them and the insulator was still bright white. there were some nice tan deposits on the electrode which is normal, but Id expect the ceramic insulator to be nice and tan too. Theyre the long reach plugs, heat range 6, one step colder than stock. I almost expected them to be a little fouled due to them being colder than stock. Any input? should I go colder? lol