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ECT and IAT variance

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Old Aug 25, 2025
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ECT and IAT variance
2004 Civic , D17A2
What should the difference be between idle air temp and engine coolant temp when engine is cold?
Having a poor start condition.
Thanks
Last edited by RayS; Aug 26, 2025 at 08:08 AM.
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Old Aug 26, 2025
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Re: ECT and IAT variance
Should be minimal and close to ambient
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Old Aug 26, 2025
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Re: ECT and IAT variance
Thank you. I suspected as much, but couldn't find the information in my searches. Pretty sure that my ECT is done.
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Old Aug 27, 2025
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Colin42
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Re: ECT and IAT variance
Get an oe one, the aftermarket ones don't seem to work
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