Hello all, I need some direction on my 2010 Maxima. It started running really rough and then the service engine light came on.
When I hooked up the code reader, it showed 2 codes.
P1800
P0301 Misfire cylinder #1
I swapped out the coil with a new one after taking the coil off.
It didn't fix the issue. I then changed out the plug and went ahead and bought a more expensive coil.
No matter what coil I put on cylinder #1, it shows a misfire for that cylinder.
Not sure if its the wiring to the coil or if I have a bigger issue.

 

Clear the codes. Move the coilpack from cylinder 1 to cylinder 3. See if a new code pops up indicating cylinder 3 (P0303). If so, it's still the coilpack.

If not, and you get P0301, you likely have a failing injector issue.

 

+i did that. The problem didnt follow the coil.
it stays at cyl #1 as misfire with a swapped coil from cyl #3. Where are the fuel injectors on these cars? Is that the fuel rail?

 

I found them. They are indeed part of the fuel rail. Hopefully, I don't have to take the whole rail off to replace the one at the first bank.

 

I hope I am not stating the obvious, but you do know bank 1 is by the firewall and not toward the radiator? I only mention that as most complain about removing the plenum.

 

the fuel rail not hard to remove ( do some YouTube for PQ) - performed surgery last year and EZ.

 

Hello all,
I decided to tackle removing the Intake this morning to resolve my Misfire from Cylinder 1 on my Maxima. I took a lot of pictures and put tape and used numbers for the electrical connectors I had to unplug and used the Alphabets for the hoses I had to remove.
This made it easy to put back together once I replaced the coil on the back of the motor.
I also took plenty of pictures before so I knew where things went when I got it back together.
All went very well. I replaced a few cracked or brittle vacuum lines that were going to be potential issues going forward. Vacuum line is not expensive and saves you from having to go back and replace them when the vehicle can't breath correctly.
The initial test drive around town, she did very well. The power of the 3.5 in these cars is back.
The true test will come Monday when I drive it 48 miles to work and then home in heavy So Cal traffic. I have confidence I did a good job because I had 2 good mentors from this forum. I can't thank you guys enough!