HELP: Getting misfires on Cylinders 1,3, 5 only

Originally Posted by Andrew's Z

Hey Guys,

Hoping you can help me out here. I have a 2012 Nissan 370Z with 52,000KM the following mods as it relates to the powertrain:

- Stillien Gen 3 Intake
- Berks HFC
- Meisterschaft Exhaust
- UpRev Tune

I was doing some highways pulls a few weeks ago and ran through way more gas than I expected and ended up experiencing loss in throttle (I know I was low on gas)... Limped to the gas station filled up all was well for a few days.

This is where my problems began, I stated throwing the great P0300 Code and threw a P0301 code the following day (never appeared again) for C#1. This started to happen more frequently especially when I was harder on the throttle so a few days later I decided to change the spark plugs since I was also noticing a periodic rough idle.

After changing the spark plugs with Denso factory replacements, cleaned TBs, and MAFS the idle issue was resolved car felt better and the code did not pop up the day I took it out for a road test, I was pretty hard on it and no code.

The following day I was driving to work and the code reappeared but this time it was only the flashing CEL, once again P0300.

So I checked the freeze frames for misfire counts and here is what I noticed, only bank 1 (passenger side) is misfiring (cylinders 1,3,5), the opposite bank looks to be running fine.

Misfire Counts Before and After spark plug change
Cylinder 1 :355 (before) | 139 (after)
Cylinder 2: 0 | 0
Cylinder 3: 178 | 69
Cylinder 4: 0 | 1
Cylinder 5: 23 | 11
Cylinder 6: 0 | 0

What do you guys think could be causing this issue, when this all first started I thought it was fuel related maybe the fuel filter or pump from running it low on gas but after seeing these results I am a little confused where to start looking.

Appreciate all your help and advice in advance!

P.S. Not sure if this is related but I having been throwing the Post O2 sensor code for over 10,000km before this problem started, only assumed it was just the HFC doing their job...