Cylinder #5 Misfire question

[mat_man1]

Okay. The wife said the car was cutting out when she was driving today. I drove it and sure enough it felt like it had a miss in it. Ran the codes and got one for 0604 cylinder 5 misfire and one for 0308 which says Closed Loop LH Bank. I am assuming these codes are related. I just changed the spark plugs for the first time since I have had it about 3000 miles ago (130,000). I think Nissan dealership changed them at 40,000 when I got it. I never had any problems relating to misfires before. I put in Autolite Platinums, I know I should have went with NGK but did not splurge at that time. Wondering where to go from here...if spark plugs could have caused it or if they could not have and if it will hurt her to drive it misfiring until I get a chance to fix it. Also what is entailed in fixing a cylinder 5 misfire? Thanks for any help. Matt

[mat_man1]

Oh yeah, I replaced MAF about a month ago but haven't had any problems with it. I have been getting about 250 miles on a tank of gas which I thought was the MAF but I am still getting about 250. I guess it could be the knock sensor with the mileage but haven't noticed a loss of power. Also could a bad knock sensor cause a misfire?

[Mike G]

What vehicle are you running? You could be looking at a failing coil pack causing your missfire. I still have not figures out the cylinder numbering, but if I remember correctly, the left bank is the front of the car and the right is against the firewall.

--Mike

[mat_man1]

I guess I forgot vehicle. It is a 98 Maxima. I think cylinder 5 is toward firewall closest to brake master cylinder. Someone can correct me if I am wrong. Thanks.