yblocker Posted July 25, 2022 Share Posted July 25, 2022 I have a ea82 in a '92 Loyale that will not idle when cold without some throttle. It used to start then run at around 2,000 rpm when cold, then drop off by itself when warm. I assume this is the job of the green harness connector coolant temp switch. The IAS works consistently whe given 12v. So my queston is, do any of you know the resisitance values for the coolant swiitch cold vs hot? They are available on Rock Auto, but are over 100 bucks. I guess it could be a harness issue too, but thought that the switch would be a good start. Link to comment Share on other sites More sharing options...
DaveT Posted July 26, 2022 Share Posted July 26, 2022 The CTS [coolant temperature sensor] is a thermally sensitive resistor. It has 2 wires, and is located on the lower part of the thermostat housing. I have posted a thread with various readings of Ohms vs temp vs Volts on this forum. 2 Link to comment Share on other sites More sharing options...
Ionstorm66 Posted July 26, 2022 Share Posted July 26, 2022 The 1 wire coolant sensor is for the gauge, and the two wire is for the ECU. 2 Link to comment Share on other sites More sharing options...
Steptoe's photos Posted July 27, 2022 Share Posted July 27, 2022 On 7/26/2022 at 2:15 PM, Ionstorm66 said: The 1 wire coolant sensor is for the gauge, and the two wire is for the ECU. Normally, yes. Good question on the values. If you had a resistor wheel or decadic wheel tool with loads of resistor values inside it, you could intercept the wire to ECU and feed it various Ohms to see if you get a change in engine behaviour at rest/idle etc. Link to comment Share on other sites More sharing options...
azdave Posted July 27, 2022 Share Posted July 27, 2022 Pic from my 87 EA82 Link to comment Share on other sites More sharing options...
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