AEM 30-6905 Universal Programmable EMS-4 - Manual (Page 161)

Page 161 of 279 EMS-4 Install and Tuning Guide_Rev 1.6
The Warm Up Enrichment table is used to compensate for poor fuel atomization during cold
start conditions. Note that “cold start” does not necessarily mean frigid arctic conditions. It
applies to any condition when the engine is not up to normal operating temperature. Additional
fuel is needed just after start and before the engine reaches normal temperature.
Tuning Tip - When creating a new tune from scratch. Leave the warmup enrichment
table zero’d out at first. Start the engine and modify the main fuel map on the fly as the
engine warms up. From this point forward, only make adjustments to the main fuel map
when the engine is up to temperature. The next day, start the engine and monitor the
AFR as the engine warms up. Adjust the Warm Up Enrichement table on the fly as the
engine is coming up to temperature.