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Cyl head temp display

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Old 4/27/15, 11:41 AM
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Cyl head temp display

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The cyl head temp readout has a zero point of 140 degrees. Car off all night with outside temp being say 30 degrees (or any other temperature) the readout is ALWAYS sitting at 140 degrees

What does everyone else see here? Why is this not accurate? BTW KEY ON ENGINE OFF in this photo

Last edited by Earlsays; 4/27/15 at 11:42 AM.
Old 4/27/15, 12:05 PM
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lowest you will see is 140 ... ECM considers engine cold until 140.
Old 4/27/15, 12:25 PM
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Well that's stupid-it should show the actual temperature up to and including
Old 4/27/15, 12:28 PM
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Yep...anything below 140 is off scale low (OSL).
Old 4/27/15, 12:36 PM
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Or SOL, like the OP is I guess.
Old 4/27/15, 01:29 PM
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Every mustang is like that.

Hop in my car in the middle of winter, or the middle of summer, and my cylinder temp always starts out at 60 C which is 140 F. It's just a matter of how much longer it takes in winter VS summer to get up to a nice warm temp (and engine oil too)

Usually mine sits around 95 C (203 F) for daily driving
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