85 300D. what's this sensor on the block?
What is the first sensor to the right of the dipstick? The second one to the right is for the coolant temp gauge I believe. A quick search through the FSM wiring diagram turned up nothing.
http://i31.photobucket.com/albums/c3...606_165611.jpg |
California or Federal? Could be something unique to the California models, but that's just a guess.
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Federal.
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I'd guess it is also a water sensor - I can't see what else it could be.
Where does the wire go? (Follow the bear) Is it some sort of electro vacuum when the engine is cold thang? |
quite certain thats the temp sensor for the emissions system.
It works at a different range of resistance than the gauge sensor and you'll know when they're placed incorrectly. |
It's a coolant sensor. #83 in the following diagram
http://www.peachparts.com/shopforum/...ontrolunit.jpg |
Yup, a water temp sensor for either the dash gauge or the EGR computer.
-J |
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I haven't seen the FSM, but I have been told by several independent sources that one sensor is for the gauge, whereas the other water temp sensor is just a temperature switch directly related to the glow plug duration. I could be wrong, but I do know first hand you cant switch them around and have your gauge work. :)
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And that coolant sensor is very important for the transmission to shift properly and for the emissions equipment. |
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I don't understand how it's connected to the transmission for shifting properly. Can you explain? Thanks again. |
Some cars use a coolant switch to change vacuum solenoids for the shift firmness.
-J |
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When I was having an over heating problem according to the gauge, my Indy mentioned to swap the two wires to see if the gauge changed, then I would know it could be the sensor. from that I thought they were the same Sensor, could be used in either hole. Swapped the wires and the gauge read the same. was another problem I finally chassed down Charlie |
I took a quick resistance reading of both sensors with a DVM and the sensor on the right (temp gauge) has approx 10x higher resistance than the one on the left (EGR control). So on my 85, I'd say they are not interchangeable.
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