Question: PE Table and Ignition Table Adjustments

[BC_Leadfoot]

When adjusting the PE, do you adjust it towards lean if it is lean or towards rich to richen the mixture? Same with spark. I know it seems like a stupid question, but the results from adjusting don't always coincide. U7198 2001 Sierra 4.8

[CANUCKPREDATOR]

Do some logging to see how its running BEFORE you make any changes. Blind changes can cause trouble. Your LTFTs should be adjusted first. PE is full throttle ONLY. LTFT is your part throttle settings.