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1. 

   Fuel Trim

   LTFT is just a compensation value. As long as it’s inside the range of -20 to +20 it’s fine. I would move on to something else on your truck to obsess about.

   • Words: 34
   • landtank
   • Post #15
   • Aug 6, 2022
   • Forum: 80-Series Tech
2. 

   Fuel Trim

   tires, bumpers and such have no bearing on your fuel trim. Its a discrepancy between the calculated base injector duty cycle and the reading from the front O2 sensor. That error is a culmination of all the variables in the system that are used to calculate the base duty cycle along with the...

   • Words: 57
   • landtank
   • Post #12
   • Aug 5, 2022
   • Forum: 80-Series Tech
3. 

   Fuel Trim

   a vacuum leak would increase your LTFT values. and the values you are reporting are in line with what I've seen.

   • Words: 21
   • landtank
   • Post #10
   • Aug 5, 2022
   • Forum: 80-Series Tech