Hey Don.

My coolant temp sensor is a 2 in 1 set up; the sensor for the temp
gauge and sensor that supplies "info" for ECU are in one housing.

I've bench tested 2 or 3 ECT sensors in a pot of water. 1 used
"German", 1 new "German", 1 offshore. (China?) They all had similar
resistances throughout the range of temps.

I've swapped the ECT (temp sensor) a few times with no change.

Given that I keep getting an ECT code, I have often wondered if
coolant doesn't heat up more when van sitting, engine up to temp on
hot day. Like there's an accumulative effect of block etc. heat
causing the ECU portion of ECT sensor to send "info" that triggers a
code.  But.   I would likely see the temp gauge swing higher up than
normal when key turned to ign. on if the coolant became too hot at the
sensor(s)

Neil.

On Thu, Aug 25, 2011 at 10:29 PM, Don Hanson <dhanson928@gmail.com> wrote:
> � OK, this is dumb but have you checked your Temp II sensor?� When I hear
> very low idle and hunting around at start up, and put that with hot weather
> problems...Check that thing....
> � Don Hanson
>
> � What is an MIL?� Is it crucial to the vehicle, does it do something
> important?� Do I have one?� Should I get one?
>
>

-- 
Neil n

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