Throwing Codes P0325 & P0301

[typer324]

So I posted on here a month or two ago about a friends 99 Maxima. His #4 coil pack went bad so I replaced it. Well he called me up last night and his check engine light was back on. I had him go to autozone to pull the codes and it came back with P0325 and P0301. I looked up the codes and it seems like P0301 means he needs to replace his #1 ignition coil, we should have replaced all of them a month ago but my buddy is cheap! The next code P0325 is for a faulty knock sensor, I know that he only runs 87 Octane but I don't think that would cause the car to throw a code. Any ideas?

[Graberhieny]

I would not change the knock sensor yet. I would go ahead and change out the other coil pack. The reason is that when you have a bad coil most likely the engine is running rough. That roughness can cause the knock sensor code to go off. My recommendations are that if the knock sensor has never been replaced then replace. If it is a fairly new knock sensor I would replace the coil pack and so back to autozone and have them erase the codes and see what happens from there on.

[typer324]

Ok I think I will just replace the ignition coil and plug and see how that goes. If the problem continues I will replace the knock sensor, although I have no clue if it has ever been replaced. Is there any DIY for the ignition coils? I know that if I have to replace the #1 coil its going to be a lot more annoying than when I replaced the #4 coil.

[Graberhieny]

They are not that hard at all. It is very straight forward.

1. If it is one of he front ones then remove the plastic emblem2. unplug the coil pack3. remove the 2 screws4. pull the coil out5. put the new one in6. put the 2 screws back in7. plug it back up8. crank the car to see if it is now running smoothly9. if so then you are done, if not then further troubleshoot If it is not working properly then i would remove the coil pack and spark plug, then push the spark plug back into the coil and hook it up to the harness. Then place the tip of the plug close to metal but not touching, you need about 1/8th of an inch, then have a buddy sit in the car and crank to make sure that you are getting a spark.

If you are doing the backside ones then do steps 2 through 9

[typer324]

I thought that I would need to take the entire intake manifold off to get to the rear bank of coils. Its the #1 coil so I think the is the one in the back on the left if you are standing in front of the car.

[typer324]

I think I just answered my own questions, I found this artice http://www.vqpower.com/v2/arti...id=45 and it appears as though I do not need to take the intake manifold off. I think you only need to do this on the newer model Maxima's.

[Graberhieny]

you do not need to take the intake manifold off...there is absolutely no need...they are exposed in the front and the back.