Tahoe 2WD V8-5.3L (2007)
Prior to reprogramming the ECM, the ethanol content must be determined. First record the ECM estimated value using the Tech2(R). Then check the
actual percentage of alcohol (ethanol) in the fuel using J 44175 or J 44175-A.
If fuel was drained, it can now be returned to the vehicle as a "next fuel fill" provided that the amount is 11 Liters (3 gallons) or more and the ethanol
content is between 0% and 85%.
Switching Between Gasoline and E85
No special precautions need to be taken when switching back and forth between gasoline and E85 other than re-fueling events must be 11 Liters (3
gallons) or greater, and the vehicle must remain in closed loop long enough (usually by the time the vehicle has been driven for 11 km (7 mi) at full
operating temperature) to comprehend and calculate the composition of the new blend in the tank.
For best driveability, the vehicle should be driven for at least 11 km (7 mi) following a refueling event when switching between gasoline and E85.
Warranty Information
