The coolant temperature is the main controlling component for cold start enrichment.
COOLANT TEMPERATURE SENSOR
This sensor provides ECU with engine temperature information relating to warm-up enrichment operation. Some models use a dual-sensor element which also signals the ignition computer (if equipped).
During warm-up period after a cold engine start, additional fuel is required to maintain engine performance. As engine temperature increases, the ECU decreases fuel enrichment until engine reaches normal operating temperature.
Sunday, February 20th, 2011 AT 12:15 PM