So the switch/potentiometer on the coolant temp sensor works as expected!
But does it actually DO anything useful in terms of MPG?
I monitored fuel consumption (GPH) using this method on a cold engine:
- Starting FWT = ~35 F
- holding engine RPM steady at 2k RPM
- check GPH value
- activate mod so FWT value is ~160 F
- check GPH value
- toggle the mod on/off several times
From what I could see, there was no change in the GPH reading.
I was talking to Tim about this. I forgot that the ScanGauge doesn't read fuel consumption directly from injector pulses. It's estimating it from air consumption. And if I keep the RPM steady, the air consumption isn't changing.
So really I needed to be using an MPGuino for the test.
It's definitely having some effect: if I let the (cold) engine go to idle when the mod is switched on (spoof the computer to think it's warm), it stumbles and dies. The mod cancels fuel enrichment (how much??) and fast idle.