› Forums › Car Problems & Maintenance › Chevrolet › How to diagnose MAF sensor and fuel trims on 2005 Silverado?
May 15, 2025 at 5:57 pm
#1553
Marc
Fuel trims are calculated using O2 sensor feedback…..upstream is usually short term….downstream .long term… If your scantool does, graphing should be linear with rpm and no drop-outs.