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International Automotive Technicians Network
Re: Euro cars & their silly Additive & Multiplicative fuel trims
Posted to Technical Discussion Forum on 2/16/2015

Think of ADDITIVE as LTFT at idle, and think of MULTIPLICATIVE as LTFT at part load.

You will also be able to find something in scan data that is an instantaneous adjustment to fuel control, which might be labeled as LAMBDA CONTROL or a similar name, and th... Login to read more.