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Author Topic: Overheat?  (Read 16729 times)

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Roger

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Re: Overheat?
« Reply #30 on: October 10, 2020, 05:58:06 pm »
Try this:

I tried to get the right file posted but now I can't see my own post. PITA!

« Last Edit: October 10, 2020, 06:03:35 pm by Roger »
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GTRS Fiero

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Re: Overheat?
« Reply #31 on: October 13, 2020, 07:31:39 pm »
I'm fairly sure this is too hot.

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GTRS Fiero

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Re: Overheat?
« Reply #32 on: November 16, 2020, 10:46:09 pm »
Got a lot of the wiring harness apart.  No apparent issues.  Still trying to figure out the cruise control.  Also looking for this overheating issue.
« Last Edit: February 14, 2021, 10:16:13 am by GTRS Fiero »
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HarryT

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Re: Overheat?
« Reply #33 on: November 17, 2020, 02:19:59 am »
87 MPH at 2350 RPM?
Harry
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GTRS Fiero

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Re: Overheat?
« Reply #34 on: November 17, 2020, 06:05:45 am »
That does not cause overheating.  I do need to see why the TCC isn't locking, though.
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Fierofool

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Re: Overheat?
« Reply #35 on: November 17, 2020, 08:25:50 am »
If the converter isn't locking and a HarryT observed, you are only turning 2350 at 87MPH, you should be realizing about 60 MPG.

If your temperature is really that high, then your engine would likely shut down n short order.  Test your leads at the sending unit, again.  Determine which one causes the Temperature light to display.  Then, with the engine cold, do a continuity test on the terminals of the sending unit.  At temperatures below operating temperature, there will be no resistance when probed between the light terminal and the sensor base as that switch is open.  The gauge side will show resistance.  Be sure your leads are connected to the correct terminals.  They can easily be repinned in the harness connector if they have been switched. 

If everything is correct, then you have either wiring or gauge problems. 
« Last Edit: November 17, 2020, 08:30:24 am by Fierofool »
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GTRS Fiero

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Re: Overheat?
« Reply #36 on: November 17, 2020, 06:58:33 pm »
Well, my Fiero does not shift to 4th until about 60 MPH.  Below that, my MPG is not that great.  Maybe due to the thermostat, it's running rich.  With the EGR/vacuum leak, MPG decreases.  My Fiero was getting 35 MPG, combined, last year.  The bad pushrod probably did not help.  The picture was not edited, and the gauges were calibrated correctly.
« Last Edit: November 18, 2020, 06:55:48 pm by GTRS Fiero »
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GTRS Fiero

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Re: Overheat?
« Reply #37 on: November 18, 2020, 07:00:48 pm »
Replacing the calibrated gauge made things...better.  this gauge is not calibrated, and sometimes decides to read hot.

The wiring from the temp gauge sender to the firewall has all been tested.  The wiring in the dash was gone through.  There may be a bad connection where the plugs connect to the instrument panel.  When the gauge reads hot, turning the key off aand on 3 times gets the gauge reading below the red again.  If sitting with the engine off, key on, sometimes the gauge just decides it's time to read hot.  The gauge reads correctly when off, but seems to read about 80 degrees hot when on.
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GTRS Fiero

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Re: Overheat?
« Reply #38 on: November 27, 2020, 12:44:23 pm »
I was told that the thermostat is always open, once the engine warms up.  That does not make sense to me.  It would seem that the thermostat would continue to open and close, to regulate the temperature of the coolant.  Which is correct?
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Fierofool

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Re: Overheat?
« Reply #39 on: November 27, 2020, 03:34:23 pm »
Once the coolant reaches the thermostat temp rating  it stays open.  It might partially close if temp drops appreciably.  Just a guess, but I know it stays open at or above temp rating.
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GTRS Fiero

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Re: Overheat?
« Reply #40 on: November 27, 2020, 03:37:27 pm »
If it stays open, how could removing the thermostat affect MPG?  The engine warms up quickly, so it would only make a difference on warm-up.
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scottb

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Re: Overheat?
« Reply #41 on: November 27, 2020, 03:49:51 pm »
If you take out the thermostat the engine won't get to operating temp and will run rich destroying your fuel economy
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Fierofool

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Re: Overheat?
« Reply #42 on: November 27, 2020, 08:00:02 pm »
There is also some restriction with the thermostat in place.  With it removed, that restriction is removed and the coolant flows freer, with the result Scott described. 
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There are three kinds of men:

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2.    The few who learn by observation.
3.    The rest of them have to pee on the electric fence and find out for themselves.    Will Rogers

GTRS Fiero

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Re: Overheat?
« Reply #43 on: November 27, 2020, 08:07:45 pm »
I may change back to the 195 thermostat.
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GTRS Fiero

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Re: Overheat?
« Reply #44 on: February 14, 2021, 10:19:49 am »
A new thermostat did not fix the problem.  Recalibrating the gauges yielded no changes.  Ran a temporary wire from the temp sender to the gauge.  No change.  For thoroughness, tested resistance from the pin on the tem sender to the gauge: .4 Ohms.

Replaced the temp sender, again, because the sender was reading all over the place.
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