I figured I’d start a new thread asking a basic question rather than assuming I know anything (which I likely don’t!).
'98 Nissan Maxima had a check engine light come on and started running very rough. I took it to get a code read and came up with P0320 and P0325. I’m not worried about the 0325 since that’s a knock sensor. 0320 is a misfire on cylinder 2.
With the car idling, I pulled the power connector from coil pack 2 to see if it made a difference in the idle - nope. I did the same for the other cylinders, and each responded with a noticeable change in the idle, which was remedied when it was reconnected.
I moved the coil pack from #2 to #4 (swapping them) and the same problem existed - idle was rough and didn’t make a difference when I pulled the power on 2, but it did on all other coil packs. So, it seems the coil pack ins’t the problem since multiple packs don’t seem to make 2 work, but they work on other 4 and 6.
I then pulled the spark plug from cylinder 2, it was very black and looked in bad shape. I replaced it. Still no love.
I then put a spare plug in the coil and was able to see spark as the engine ran, so it seems that the coil pack at 2 is getting juice.
So, I have gas (big odor when the car is running - seems super rich)
I have spark
Still running very rough and the 0320 code remains.
Ideas of where to go next? I’m almost resigned to going to a shop and spending far more than I was hoping. I’m not sure what else I can do to determine, and alleviate the problem.