[Shotimes] temp sensors... was: ECT description & location

[Mark Nunnally]

Only 2 are feed to the EEC, and I can't find anything in SCtuner graphs and
such that the ACT has anything to do with anything.  The voltage curve for
it (same as the ECT) is all wrong anyway.

The ECT does have a lot to do with the EEC's engine program though...

Yes the EEC-IV datalogger runs on a laptop (or a desktop if you have a real
long extension cord :) and monitors/records/plays back EEC data in
real-time.  Has inputs for additional sensors as well, wide band O2, EGT,
MAP, etc.  A very handy dandy tool for tuning.  You can make a pull, record,
and look at it back on a graph in relation to everything else.  Ie pick a
point on a chart, say 6800 rpm at WOT, and see exactly what the MAF voltage
is, injector duty cyle, pulse-width, advance, etc A/F readings (if you have
a wideband O2 hooked up) etc.

There should be a few of them floating around the convention, (I know that
at least myself and Josh will have our's there).  SCtuner, EEC-IV
datalogger, and Wide-band 02's (on dash display as well as hooked up to the
datalogger).

mark

----- Original Message -----
From: "van Oss" <vanOss@centurytel.net>
To: "Justin Schick" <jschick@aafp.org>; <shotimes@autox.team.net>;
<TechSHO@topica.com>
Sent: Wednesday, July 02, 2003 3:38 PM
Subject: [Shotimes] temp sensors... was: ECT description & location


> Your average SHO has at least FIVE temp sensors.  Two are AIR sensors for
> ETAC:
>
> --- Outside air temp sensor is on the radiator wall, near hood latch.
>
> --- Interior air temp sensor is behind the "SHO" plate on the passenger
side
> of the dash
>
> And three of them are COOLANT temp sensors:
>
> --- Cold Engine Lock Out (CELO) switch is in the engine bay, mounted on
the
> steel portion of one of the heater hoses.  Keeps the ETAC from blowing
cold
> air on your feet until the engine's warmed up a bit.  Two-wire connector.
>
> --- Engine Coolant Temp (ECT) sensor is mounted on the rear part of the
> rat's nest of coolant piping just above the tranny.  This one is a
> thermistor that tells the engine computer about engine temp.  Plays a role
> in fuel mixture, don't ask me how I know.  Two-wire connector.
>
> --- Sending unit for the dash Temp gauge:  Again, a thermistor controlling
> the ground side of the dash gauge.  Mounted very near the thermostat.
> One-wire connection.
>
> Joseph van Oss
>
>
>
>
> ----- Original Message -----
> Can anyone tell me which temp sender is which. I can see a one wire one
> close to the thermostat housing and more to the front of the engine bay,
> and a two wire one further from the housing and rearward. My gauge seems
> to operate fine, but am questioning the sender for the computer. I
> recently replaced my O2s. No more CE light, but I still only get 22 mpg
> maximum.
> Thanks!
> Justin
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