[rsunahar]

For some reason, the stock temperature gauge on my 1g Eclipse rises to halfway depending on load.
For example, on long extended inclines, such as going 70mph on an inclined freeway, the gauge goes a little past the halfway mark.
However, my datalogger shows that temps never get above 199-201ish.
I thought it was the sender and replaced it, but readings are still the same.

I'm not quite sure if the stock gauge is inaccurate or if the temp sensor to the ecu is.

Has anyone experienced this?

 

[AWDPetmitsu]

I think there is more than one coolant sensor? One sends to the ecu and another sends to the gauge.

 

[MonoTalonAwd]

I think there is more than one coolant sensor? One sends to the ecu and another sends to the gauge.

That is right! The sensor for the dash guage has one prong and the one for the ecu has two prongs. They are all threaded into the thermostat housing. And if you have a/c, there's another one, for the second radiator fan activation I presume. Correct me if I'm wrong.

 

[jivemastert]

make sure you are using a probe that is calibrated for your gauge... for example, a probe calibrated for an autometer gauge wont work for your mitsu gauge.

also, if you replaced the ecu probe, that wont change what the dash gauge probe shows. i just completely disconnected mine and am using an autometer temp gauge with the probe in the old gauge's hole. works perfectly.

 

[rsunahar]

make sure you are using a probe that is calibrated for your gauge... for example, a probe calibrated for an autometer gauge wont work for your mitsu gauge.

also, if you replaced the ecu probe, that wont change what the dash gauge probe shows. i just completely disconnected mine and am using an autometer temp gauge with the probe in the old gauge's hole. works perfectly.

I realize the two senders are different.
Maybe my post isn't so clear.

I replaced the stock gauge sender with a brand new factory gauge sender.
However, my stock gauge still shows, at times, that I'm overheating. It goes a little past the middle mark.
Yet, juxtaposing the data on my datalogger, I'm seeing 190F, while I'm seeing past the halfway point on the gauge.
It wasn't like that before.
So, considering that I've replaced the stock gauge sender, I'm thinking that possibly the coolant temp sender/sensor is the one that is malfunctioning. Or, it could be something's simply wrong with my gauge cluster, causing false readings.

But maybe I should just do as you did---replace the stock gauge sender with an autometer unit and add another gauge to the pillar.

 

[jivemastert]

I realize the two senders are different.
Maybe my post isn't so clear.

I replaced the stock gauge sender with a brand new factory gauge sender.
However, my stock gauge still shows, at times, that I'm overheating. It goes a little past the middle mark.
Yet, juxtaposing the data on my datalogger, I'm seeing 190F, while I'm seeing past the halfway point on the gauge.
It wasn't like that before.
So, considering that I've replaced the stock gauge sender, I'm thinking that possibly the coolant temp sender/sensor is the one that is malfunctioning. Or, it could be something's simply wrong with my gauge cluster, causing false readings.

But maybe I should just do as you did---replace the stock gauge sender with an autometer unit and add another gauge to the pillar.

when the temp sender for the ecu went bad on my car it would give really jumpy readings and then eventually it threw a check engine light for a malfunctioning engine coolant circuit. your gauge might be going crazy, but it's hard to say.