EGT the other way?.

[goflo at pacbell.net]

Could get an idea with a torch and an ohmmeter... Send the little 
guys out for pizza 1st?

Bruce Plecan wrote:
> 
> This might sound dumb, but I was looking at some gm service
> manuals, and they show that the HEGO2 draws different levels
> of current as the sensor heats.
> 
> NOW, instead of using the heater as just a heater, after it is warm
> turn it off, then just use it a EGT sensor.  Use the difference in
> resistances as a sensor.
> 
> Or install a inline resistor with the heater, and use the voltage drop
> as a calibration scale.
> 
> Neither would be perfect but would/could/might be alot better than
> chopping up an exhaust for an EGT sensor.  Just go to gm (or
> how ever), and get a 4 lead O2 sensor.  I specify 4 lead just so
> any body/chassis grounds are not included in a possible errors.
> 
> Any thoughts?.
> Cheers
> Bruce