My fuel trims have gone lean over time. I have cleaned the maf sensor and checked the fuel pressure and it's good.
running a little lean on 2002 Chevrolet Camaro
What is the long term & short term numbers?
Anything below 15% is normal. These numbers are good. You might get them better by doing a complete Fuel Injection Service. If you want to know more about this e-mail me at email@example.com. It's refreshing to read that you know what to look for. E-mail me.
The long trims are + 6-10 while crusing. The short trims for the driverside can go up to + 12 for a sec. The long trims used to read - while crusing.