P0300 Misfire Freeze Frame Data

Jhill · 09-21-2020, 01:44 PM

Quote:

Originally Posted by sjwoodwalker

I appreciate the reply. I guess I should have put these question in the original post, but:

STFT B1 0.00% = Short-Term Fuel Trim for Bank 1 (right side)
LTFT B1 0.00% = Long-Term Fuel Trim for Bank 1 (right side)
STFT B2 1.60% = Bank 2 (left side)
LTFT B2 3.10%

Why is my STFT and LTFT B1 both at 0.00%? Should it be reading something like the bank 2s?

Also on the O2 sensors and A/F Sensors, what is the correct voltage for those? I had read they were supposed to be below .8v

Thanks again!

You got it backwards, your B2 ideally should be more like your B1. Your B1 is doing zero corrective action so it’s mapping based off the MAF and then feedback from the AFR sensor is perfect. Your B2 is either under reporting air from MAF, slight vacuum leak, exhaust leak before AFR etc making it have to correct and add fuel. Although 3% isn’t a huge variation.

As to it being related to your misfire, I doubt it.

sportsman2003 · 09-21-2020, 02:27 PM

Most often the P0300 is un-metered air flow be sure all of your air intake clamps are tight and hoses are seated properly. Do you have an aftermarket cold air intake on the car?

sjwoodwalker · 09-24-2020, 06:48 PM

Yes but I installed it after the first time it can on thinking it might fix it if there was a problem with the stock intake.

sjwoodwalker · 09-24-2020, 06:49 PM

Quote:

Originally Posted by Jhill

You got it backwards, your B2 ideally should be more like your B1. Your B1 is doing zero corrective action so it’s mapping based off the MAF and then feedback from the AFR sensor is perfect. Your B2 is either under reporting air from MAF, slight vacuum leak, exhaust leak before AFR etc making it have to correct and add fuel. Although 3% isn’t a huge variation.

As to it being related to your misfire, I doubt it.

Thank you for you're help!

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09-21-2020, 02:27 PM	#2 (permalink)
sportsman2003 Base Member Join Date: Dec 2018 Location: In the moment Posts: 191 Drives: Sideways most times Rep Power: 11607	Most often the P0300 is un-metered air flow be sure all of your air intake clamps are tight and hoses are seated properly. Do you have an aftermarket cold air intake on the car?

09-24-2020, 06:48 PM	#3 (permalink)
sjwoodwalker Base Member Join Date: Sep 2020 Location: Texas Posts: 4 Drives: 2010 370Z Rep Power: 6	Yes but I installed it after the first time it can on thinking it might fix it if there was a problem with the stock intake.