Resetting Long Term Fuel Trims

Long term fuel trim corrections can be reset by resetting PCM Keep Alive Memory (KAM). See KEEP ALIVE RANDOM ACCESS MEMORY RESET PROCEDURE  under CLEARING CODES under SELF-DIAGNOSTIC SYSTEM. After making a fuel system repair, KAM must be reset. For example, if dirty/plugged injectors cause engine to run lean and generate rich long term corrections, replacing injectors and not resetting KAM will now make engine run very rich. The rich correction will eventually be "Learned Out" during closed loop operation, but vehicle may have poor driveability and have high CO emissions while it is learning.