Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community - FT86CLUB - View Single Post - High Negative LTFT on N/A BRZ causing idling issues

paintdude258 · 07-06-2016, 09:23 PM

@tracerit UPDATE Holy Moly..... UPDATE! My problem is fixed!

So per your story about the airbox, I decided that I had two options.

Go through the pain staking task of taking off the bumper to change my intake, or attempt my go at Calibrating my MAF.

The MAF idea required A/C, so that's what I did.

I used VGA's tool, took all the necessary logs, put my numbers into the tool, uploaded the new numbers onto my tune...

Car runs like a DREAM! LTFT stays within -+1 at all times!

I am going to rescale it once more, then do closed loop, but after 100 miles with the new calibration, fuel trims are holding strong.

It would appear as though I didn't clean off the intake enough when I oiled it, causing the amount of air passed through the filter to decrease.

07-06-2016, 09:23 PM	#53
paintdude258 Senior Member Join Date: May 2015 Drives: 2013 Subaru BRZ Limited Location: Austin, TX Posts: 121 Thanks: 71 Thanked 24 Times in 18 Posts Mentioned: 2 Post(s)	@tracerit UPDATE Holy Moly..... UPDATE! My problem is fixed! So per your story about the airbox, I decided that I had two options. Go through the pain staking task of taking off the bumper to change my intake, or attempt my go at Calibrating my MAF. The MAF idea required A/C, so that's what I did. I used VGA's tool, took all the necessary logs, put my numbers into the tool, uploaded the new numbers onto my tune... Car runs like a DREAM! LTFT stays within -+1 at all times! I am going to rescale it once more, then do closed loop, but after 100 miles with the new calibration, fuel trims are holding strong. It would appear as though I didn't clean off the intake enough when I oiled it, causing the amount of air passed through the filter to decrease.