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Message: <blockquote data-quote="ORVietVet" data-source="post: 23919" data-attributes="member: 9438"><p>Keep in mind that with the coolant sensor plugged in, and on a cold engine start, the system is in open loop and it will push more fuel/rich readings and then when the engine warms up enough and the oxygen sensors get warm enough, the system gets in to closed loop and the fuel trims lean down. The coolant sensor is part of the equation for the ECM to get engine temp readings and make adjustments accordingly.</p></blockquote><p></p>