Replacing the Engine Temperature Sensor
#31
Replaced mine when doing my valve cover gaskets and I can feel a noticeable difference. Shifts smoother and it feels good. I think my MPG improved as well. Definitely a plus to change this out, especially considering how cheap and easy it is.
#32
Driver School Candidate
Just did mine last week and a cup or so spilled out. I bought one from ebay (I know) and the adapters don't seem to fit together. Waiting on the new one from Rock Auto and hoping it all fits together.
#39
I have a permanent OBD2 scanner connected with bluetooth. My normal operating coolant temperature is 85 degrees C / 185 degrees F. The car is at 114K miles and I recently measured 29.2 mpg at constant 55 miles per hour, flat terrain over a distance of 20 miles. I can monitor the rise of the temperature, and the opening of the thermostat.
So I will not replace my ECT for now , as it appears to be operational as it should. I do not want to mess with crumbling connectors, as I had experienced with the camshaft connector while replacing the valve cover gasket.
My suggestion would be:
1) read the coolant temperature through the OBD2 to check if it is within range.
2)If you do not have an OBD2 scanner, read the resistance of the ECT sensor on vehicle. Remove the connector and read the resistance between the pins with an ohmmeter when the engine is cold. It should read about 5Kohms to 2Kohms depending on the coolant temperature (32 degrees F to 68 degrees F). Plug the connector back. Bring the car to full operating temperature, then remove the connector and read the resistance. It should be around 200 ohms at the operating temperature of 185 degrees F.
If you have to replace the ECT sensor, make sure you do not introduce any air in the cooling system (purge the the air). Else you may end up with inaccurate coolant temperature readings at the OBD2 and possible engine overheating.
So I will not replace my ECT for now , as it appears to be operational as it should. I do not want to mess with crumbling connectors, as I had experienced with the camshaft connector while replacing the valve cover gasket.
My suggestion would be:
1) read the coolant temperature through the OBD2 to check if it is within range.
2)If you do not have an OBD2 scanner, read the resistance of the ECT sensor on vehicle. Remove the connector and read the resistance between the pins with an ohmmeter when the engine is cold. It should read about 5Kohms to 2Kohms depending on the coolant temperature (32 degrees F to 68 degrees F). Plug the connector back. Bring the car to full operating temperature, then remove the connector and read the resistance. It should be around 200 ohms at the operating temperature of 185 degrees F.
If you have to replace the ECT sensor, make sure you do not introduce any air in the cooling system (purge the the air). Else you may end up with inaccurate coolant temperature readings at the OBD2 and possible engine overheating.
#40
thanks to the owner of the post
thanks for all the support that is available on the discussion thread , its true and I have solved the issue of P0171 system too lean bank
I ride a 2004 with 136k miles and I had the issue long ago I replaced the MAF sensor, followed by cleaning the O2 sensors, different mechanic giving me different options to try which even reached to changing the petrol tank cap.
it got finally solved once I changed the temperature sensor which was the last thing I could think off.
I ride a 2004 with 136k miles and I had the issue long ago I replaced the MAF sensor, followed by cleaning the O2 sensors, different mechanic giving me different options to try which even reached to changing the petrol tank cap.
it got finally solved once I changed the temperature sensor which was the last thing I could think off.
#41
I have wanted to do this for some time now. Mine has not failed nor do I have any codes but from what I learned from the LS400 and the forums is they don't tend to fail like this. They basically start sending incorrect signals to the ECU. Misreading the correct engine temperature, which affects mileage and performance. Couple pics of the sensor. Trying to figure out who makes it. It's not Denso. The mark looks like Tie or Tiej. I don't know.
Do I need to coat the threads with any kind of additional sealant? Any other suggestions?
Do I need to coat the threads with any kind of additional sealant? Any other suggestions?
The following users liked this post:
BNastee (08-22-19)
#42
Moderator
This reminds me... I need to order a sensor before I do my Timing Belt next week...
#43
Intermediate
I just replaced my temp sensor today with one from Oreilly's. (Their import direct brand that has a lifetime warranty) I'll update if my fuel mileage increases. Right now I get about 21 combined with 75% HWY and 25% CITY.
#44
Don’t forget to check for coolant leaks a week later in case if you haven’t used silicon or Teflon based sealant for the threads. also, why not the OEM sensor? It is an extremely important part in 3uz-fe engine, so I would never recommend to put anything in it except for oem genuine part.
#45
Intermediate
Don’t forget to check for coolant leaks a week later in case if you haven’t used silicon or Teflon based sealant for the threads. also, why not the OEM sensor? It is an extremely important part in 3uz-fe engine, so I would never recommend to put anything in it except for oem genuine part.