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Good points GarageJDM. I differ with the Lambda thoughts. My Bosch CIS books talk about tuning with the Lambda disconnected and then connecting to operate after tuning. That would make me think the Lamda is influencing after warm-up to trim during operation. There are two components present that are specifically used just for warm-up. One affects fuel pressure value to richen the mixture during warm-up, and the second to add more air during warm-up. Each has a thermo element to warm and change the state of the device.
Your point of the (027) option hits the other nail on head. Thanks!
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