aclwalker 3 Posted August 9, 2015 Has anyone got a really good explanation of ODB1 fuel trims? I understand the basic concepts of what it's all about, but all the explanations I can find talk about a short term and long term fuel trim, with positive and negative numbers, whereas my VR6 (OBD1 I believe) fuel trims seem to be based around being above or below 1.000 and there are three values: idle, part throttle and full throttle. There also doesn't seem to be a short vs long term trim. Am I right in thinking an OBD1 fuel trim of, say, 1.055 is the equivalent of an OBD2 trim of +5.5%? And one of, say, 0.900 is the equivalent of -10%? I've checked out the Ross Tech information and videos and their explanations just don't seem to fit what I'm presented with, for the reasons above. Quote Share this post Link to post Share on other sites
