Comments: 1-15, 16-30, 31-45, 46-60, 61-75, 76-90, 91-105, 106-120, 121-135, 136-150, 151-165, 166-167
If you want to diagnose which coil is bad, here is what to do.
Unbolt each of the coil packs.
While the car is cold, start it and let it idle.
When the idle comes down to 800rpm (normal idle), one by one pull the plug wire off one spark plug at a time.
When you pull one off, and it makes no difference in the idle, that is your bad coil pack. replace it with oem Nissan part (through courtesy parts, etc)
Re. the last comment. Is it safe for me to disconnect coils while the engine is running? Aren't there the risk of electric shocks? And why do you need to unbolt the coils first?
BTW, today I have replaced the 3 front coils. The check engine light was reset, but I need to wait a couple of weeks to see if it turns back on. It takes that long usually after a reset.
Unfortunately, my engine still has the knocking/pinging noise. So tomorrow, I will play with the 3 back coils.
By the way, because of the lack of recall on this matter, I am also not buying another Nissan ever again.
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