 Oil Temp Indicator = Oil Temp Sender/Sensor? |
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| torakki |
 Aug 24 2025, 05:25 PM
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#1
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Member  Group: Members Posts: 66 Joined: 5-October 18 From: Nor Cal Member No.: 22,545 Region Association: Northern California  |
I'm trying to track down a temperature issue on our 2.0L, and have replaced the gauge and sender. Temp still goes to red (about 280F), within 10 minutes of driving. Temp is actually around 165F from a laser temp reader. Only thing I can think of is wiring.
Am I correct, when I see the wiring diagram showing the Oil temp indicator is the same as the sensor? The diagram shows an "indicator" and a "gauge". I want to run some external, new wires to see if there's a difference. Thanks for any knowledge.  |
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| torakki |
Aug 26 2025, 07:08 PM
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#2
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Member Group: Members Posts: 66 Joined: 5-October 18 From: Nor Cal Member No.: 22,545 Region Association: Northern California |
Yes Bruce, you were all over it. This morning, I ran new wires from the sender to the gauge and from the gauge straight to ground. I let the car idle for about 5 minutes and almost nothing. I started moving wire around on the back of the gauge and I noticed the temp went way up. That was with the ground disconnected. So, it appears I have a bad ground. Then I realized that my voltmeter wasn't working either. I hooked up the new good ground and now it works. Tomorrow, I'll redo the ground, and it "should" be fixed.
Thanks for all the responses and support. Photos are after idling for 10 minutes.   |
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Posts in this topic
torakki Oil Temp Indicator = Oil Temp Sender/Sensor? Aug 24 2025, 05:25 PM
930cabman :headbang:
seems very odd, wish I could be of ass... Aug 24 2025, 05:50 PM dtmehall Assuming that you have the correct wiring diagram ... Aug 24 2025, 05:55 PM JeffBowlsby Please state the model year of your chassis. Aug 24 2025, 06:55 PM Dave_Darling What are you getting the temperature of with the l... Aug 24 2025, 08:37 PM torakki The car is a 1974 2.0L. I was pointing the laser a... Aug 24 2025, 08:44 PM JeffBowlsby Your posted circuitry is accurate, but it’s not ... Aug 24 2025, 09:14 PM bdstone914 Get a laser temp from the oil filter or sump plate... Aug 25 2025, 01:51 AM TRP I was thinking the same thing that @bdstone914 n... Aug 25 2025, 06:01 PM torakki Looks like the new schematic from Jeff match's... Aug 25 2025, 07:41 PM bdstone914 The sensor reads resistance to ground. You may hav... Aug 25 2025, 08:24 PM
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