fuel trim

Year/Make/Model: 2007 Mazdaspeed3 Mileage: 230k (engine rebuild 30k~ miles ago, prev owner) Location: ATL, GA Concern: Fuel trims out of whack DTC's: (please include descriptions) None Modifications: Forged Pistons (Unknown Details) Cobb Cold Air Intake Balance Shaft Delete Upgraded High...

Hello fellow Mazdaspeed guys, first of all: I've been through all the possible threads on this forum to my issue, went to the borders of all knowledge and ideas in my german group, discussing with many tuners, good mechanics and so on. I even have been to other forums aboutnon 4 bangers as well...

Most of the time my car runs on the richer side of normal, however there are some circumstances where my STFT will climb to +25. If I'm very light on the throttle like driving through a crowded parking lot, STFT will slowly climb to +20 or more and will stay there until I let off or give more...

Ive been trying to chase a fueling issue the past couple weeks, seemingly to no resolution. my longterm fuel trims are sitting at -20.44, give or take about 2% either way. I was watching my AFR otw to work this morning, and it dipped down into the 9.0/1 range, and i let off as soon as i saw...