Neil,

"The coolant temperature sensor is a temperature sensitive variable resistor sensor (less resistance as temperature increases). This sensor returns signals to the ECU to determine amount of cold start enrichment, ignition timing and idle stabilization during warmup. The sensor return signal has input to the ECU when the oxygen sensor, idle stabilization, and full throttle enrichment functions are activated."

Last sentence a little ambiguous eh?

Alistair

> On Sep 24, 2013, at 9:06 PM, neil n <musomuso@GMAIL.COM> wrote:
> 
> Thanks again Scott.
> 
> It's been a while since I've used an infrared gun at various points on
> the engine. I'll measure the head and outlet at head. Was just being
> somewhat lazy.