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11-28-2020, 02:58 PM | #1 |
Scooby Specialist
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2017 STi fuel trim issue
I build and tune my own (and kids) cars.. this issue relates to my sons 2017 STi
So... 8 months ago installed ID1050's and Cobb AF intake. Adjusted the shelf stage 3 map (MAF) due to not installing fuel pump, reg and rails. Had no issues until a month ago when suddenly the fuel trims (both short and long term) started adding fuel like crazy in the 2400~3200 RPM range at low to light load. The trim add total is 35~40% To date I have taken these actions: -Pressure test intake system (no leaks) -Replaced MAF -Replaced O2 -Checked fuel pressure (was OK) -Leak down (was OK) -Re scaled intake (worked fine for a day then AFU again) -Switched tune over to speed density (no change) -Disabled fuel trim correction (yea, it went lean, bucked and was just plain pissed off).. Update here.. I ran this test again and data logged "Roughness" and Cyl 3 showed a value of 2 and just before letting off, cyl 1 showed a value of 1. 22% throttle, -2.33 vac, AFR was 18/1 Any ideas? Thanks Jeff
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Last edited by TurboQueef; 11-29-2020 at 11:58 AM. Reason: add more detail on tests |
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