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Discussion Starter · #1 ·
It seems that I remember reading there are two coolant temperature sensors on the 2nd generation one for the gauge and one that reports to the ECU for fuel mixture. Is this correct or did I somehow dream this up? The gauge is reading correct. I've looked on Rock Auto and can only find one ECT sensor. If there are two someone please tell me how to find the other one on Rock Auto. Something is definitely screwing up my gas mileage on the '94. I've replaced plugs/wires both of which it needed, PDFE sensor which I had a code for, cleaned the MAF sensor and located and repaired a vacuum leak yet the mileage is still low. This leads me to believe it's a problem with the ECT sensor or the O2 sensor. I have a brand new O2 sensor here at the house but can't seem to get anything on it where I can turn it to remove the old O2 sensor for the a/c lines.
 

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Discussion Starter · #4 ·
Thanks denisond3. Am I correct in assuming the coolant sensor that helps control a/f ratio is also the sensor that controls the cooling fan? I don't have any codes stored in the ECU. I ordered an ECT sensor from Rock Auto last night. Hopefully that will take care of my poor mileage issue.

I've got a regular 6 pt. O2 sensor socket and can get it on the sensor but then there's no room to turn the ratchet because the a/c lines are in the way. Right now I'm in the middle of a laminate flooring project that will probably take me the rest of this week then maybe I can get back to looking at the car.
 

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Discussion Starter · #7 ·
You might also consider verifying that the temperature sensor in the airbox is functioning properly.
That's a good thought, I hadn't thought about the IAT sensor. If the ECT sensor doesn't do the trick I'll look into the IAT sensor. With gas hovering around $4.25 a gallon I need to find the problem.
 

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Discussion Starter · #8 ·
Hopefully I've found the problem. I was checking the resistance on the IAT sensor this afternoon and it showed it open. Sensor has been ordered and should be here Friday. Once I get the sensor in and have had a chance to check mileage I'll give an update.
 

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Discussion Starter · #9 ·
My last post was incorrect. Upon rechecking the IAT sensor it tested good. Apparently when I tested the other day I had the multi meter set at the wrong ohm setting. I had received the new IAT sensor today and was checking the ohm reading on it prior to installing it and decided to recheck the old one before putting the new one in and the readings were the same.
 
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