Nissan Quest 99 Cylinder 6 Misfire then Knock Sensor?

Question

I have a Nissan Quest 99 SE with almost 170,000 miles on it. It has given me some headaches:
After I drove a little while, the Check Engine light would flash and, would usually stay on, occasionally off when it stopped. Using an AutoScanner it showed Code “P0306 Cylinder 6 Misfire Detected”. No more other code.
Taking the suggestion of my friend who works as a mechanic at a Toyota dealer, I swap-tested the plug wire to the #6 cylinder, replaced spark plugs (E3 E3.56 spark plugs. I suppose it should be better quality because it has longer warranty), replaced distributor cap and rotor. After finished this, when the engine started, idle was rather rough with the engine shaking quite a bit, and after driving it a little while, the MIL flashed again, but this time the Code is “P0325 Knock Sensor 1 Circuit Malfunction Bank 1 or 1 Sensor”, the Code “P0306 Cylinder 6 Misfire Detected” did not show up again.
I really don’t understand why it did not show up together with Cylinder 6 misfire at first place? Is it changing the spark plugs killed the Knock Sensor? Is it the wrong spark plugs? What else should I check or replace before I take it to the dealer? Any advice would be greatly appreciated.

Answer 1

dtc p0325 will not set mil light on nissan quest

Answer 2

Knock sensor detects PING from low quality gasoline. So as long as you do not get the P0306 the #6 misfire has stopped. Here is the bad news... Misfire can cause the Cat converter to overheat. Latter resulting in a P0420 or P0430 code.

Answer 3

Oh, yeah, there are plenty of folks who post here like they know more about their vehicle than the engineers who designed it do. Like you. Now, you see the end result. You can replace all the parts you want, but I wouldn't. I believe Ranger 3.slows are bad on intake manifold gaskets or head gaskets, hence your misfires. Misfires come from fuel, spark or compression issues. Not sure why you involved O2 sensors and are getting stupid and thinking about replacing a cat converter over this...

Answer 4

you fixed the missfire but crossed wires so the pistons are fighting each other witch causes the knock. check the wires again