Originally Posted by
quicsilvia
The feature is like a choke on a car with a carb so when its open its running rich till the car warms up then the system will go into a closed loop condition and lean out
No, it isn't. You're referring to coolant temperature correction:
Fuel Correction
Even when warm, the ECU only operates in closed loop in cruise. During periods of positive boost pressure, the ECU goes open loop.
Here's a list of conditions that will keep the Haltech unit out of closed loop:
- The startup time described in Post Start Delay setting has not yet elapsed since startup
- The throttle or MAP thresholds selected in the O2 Control settings are exceeded
- The engine is operating outside of the Lower RPM and Upper RPM
- Transient Throttle Enrichment is active
- Engine is not above the operating temp threshold as defined in O2 Control settings
- Deceleration Fuel cut is performing cut or enrichment operations
What I want to know is what sensor(s) drives the ECU into/out of open loop, and what the cutoffs are.