Please help!! i have a 2010 g37s with 115k on it. im having a p0300 issue cylinder 1,3,5 seem to be misfiring the most. I have changed the battery spark plugs all 02 sensors. I have stillen intakes fast intention test pipes and invidia catback exahust below i have shared the bluedriver info if anyone can please help me with this issue.

 

How long have you had this issue and how long has the test pipes been on?

 

I’ve been having the issue for about 4 months now car just got test pipes last month. I understand the car will need to be tuned. But for car to be tuned the misfire need to be addressed.

 

Understood.

Using the live data section of the BlueDriver, look at the short term and long term fuel trims for each bank, WHILE the engine is at a hot idle.
What are they?

 

long term bank 1 5.5%
short term bank 1 -5.5%
short term bank 2 4.7%
long term bank 2 7.0%
o2 bank 1 .280v
and 02 bank 2 says n/a

 

Weird... your mis-fires are on bank 1, but your bank 2 fuel trims are a little high and you don't have a reported voltage for B2S2.

 

i don’t want to keep throwing money at it because I don’t know. Could it be the ignition coils? It’s werid to me because it’s 1,3,5 so I thought injectors.

 

Subscribed to follow for any resolution. I too am being told I have a Cylinder 3 misfire by an Infiniti dealer currently. They've swapped the coil packs and plugs and it's still misfiring and they told me they think it could be the pigtail/harness connector from the ignition coil pack to the main engine wiring harness maybe. Sigh.

Did you get it figured out?

 

no I am still having this issue. 1,3,5 seem to be having the most misfires.

 

It is possible that the scanner is mixing the PID. I've had some issues in the past where the scan tool mixed my TPMS sensors as well as one of my AFRs.

OP you should disconnect the bank 1 02 sensor and see if reading goes blank. If it does then try swapping the the sensor over or see if Bank 2 connector will reach bank 1 sensor and see if bank 2 starts reading.
If it does start with the obvious sensor on bank 2 and go from there.