The "loop" closes when the heated O2 exhaust sensors become hot enough to send their signal/info to the ECM. Most modern vehicles have electrically heated O2 sensors in order to "close the loop" quickly. I observe "closed loop" within seconds of cold engine start-up. There's no reason for the A/F ratio to be rich/lean just because engine coolant is not at X temp.Do you know what temp it closes? I noticed VCM gals reads the PCM at 165 and with VCM back on the vehicle maintains 189-190 steadily.
I thought you were sure of it. You were saying earlier that the system will run rich if you use sVCM. You are the only one stating this and it contradicts all others' experience:I wouldn't be sure of that. Its a complex system
And the fuel trims run rich.
MPG dropped greatly with disabled. I believe because of fuel trim
lost at least 4 mpg
The ECU thinks the engine is never warmed up keeping a richer mixture.
I show richer fuel trims in my scangauge
Disabling VCM does make the engine run richer.
Yep, we've heard you. You are sure it's running rich.I am saying you cant be sure that its NOT running rich. It IS running rich.
…..and here I thought the heated O2 sensors “closed” the loop once heated, allowing the motor to run clean/lean. How silly of me.🤦♂️🤦♂️🤦♂️🤦♂️ I’ll have to pay closer attention to the ScanGauge as to how many seconds it takes for “the loop” to switch from “open” to “closed”. A number of variables allow the system to switch back and forth, closed to open/open to closed while driving.I am saying you cant be sure that its NOT running rich.
It IS running rich.