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Author Topic: My Misc Fiero issues  (Read 125329 times)

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GTRS Fiero

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Re: Misc Fiero issues
« Reply #390 on: October 09, 2019, 09:18:03 pm »
I can understand the fan running more; however, since coolant is not circulating, the engine should not know that the fan is running.
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GTRS Fiero

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Re: Misc Fiero issues
« Reply #391 on: October 13, 2019, 10:40:09 pm »
With a different VSS, the check engine light came on, and the speedo is off by about .5 MPH at 60 MPH.
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GTRS Fiero

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Re: Misc Fiero issues
« Reply #392 on: October 14, 2019, 05:44:53 pm »
A 25-amp fuse blew.  Today, I wanted to test, so I replaced it with a 5-amp fuse, but can't get it to blow.  If I pull the fuse, the things on that curcuit do not work.  Maybe there's a trick to it.
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Fierofool

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Re: Misc Fiero issues
« Reply #393 on: October 14, 2019, 08:28:07 pm »
Quote from: GTRS Fiero on October 13, 2019, 10:40:09 pm
With a different VSS, the check engine light came on, and the speedo is off by about .5 MPH at 60 MPH.

There are comparative tables that I heard Raydar refer to as 'Lookup Tables' where info from one sensor should fall within range of info on another table.  TPS and VSS for example.  The TPS should be reading at a certain level when the VSS output is at a certain level. 

When my 2nd 85 broke the VSS shaft and gear, the car ran horribly because that input was telling the ECM that the car wasn't moving though the TPS said it should be.  Air/fuel was affected, too because the ECM was trying to correct input for an engine that was supposed to only being revved according to the info it was receiving.
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There are three kinds of men:

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GTRS Fiero

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Re: Misc Fiero issues
« Reply #394 on: October 15, 2019, 07:19:33 pm »
I installed the 180-degree thermostat, today.  Now to get the rain turned off.
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GTRS Fiero

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Re: Misc Fiero issues
« Reply #395 on: October 16, 2019, 08:10:58 pm »
Went for a drive.  Well, the gauge gets slightly past the 220 halfway mark, but can also move down to half of that.  Hmmm.
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Fierofool

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Re: Misc Fiero issues
« Reply #396 on: October 16, 2019, 08:14:00 pm »
You need an infrared thermometer to check the temperature on the thermostat housing and compare it with the gauge. 
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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: Misc Fiero issues
« Reply #397 on: October 16, 2019, 08:15:25 pm »
Yeah...  Or the fan unclogged.
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GTRS Fiero

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Re: Misc Fiero issues
« Reply #398 on: October 17, 2019, 11:24:13 pm »
I've been pulling logs from my Fiero for analysis.  Today, I noticed that the log showed knocks.  Interesting.  I do not have a knock sensor.  It also showed "knock advance".  Also interesting.

It seems that my air/fuel mixture is off.

My "desired idle speed" gets down below 625.

And the idle drops when shifting into gear.  I thought someone posted on here that their idle increased.

The gauges read exactly what the ECU shows, which I guess is a good thing.
« Last Edit: October 17, 2019, 11:26:47 pm by GTRS Fiero »
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GTRS Fiero

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Re: Misc Fiero issues
« Reply #399 on: October 18, 2019, 08:51:58 pm »
This SES light is really annoying.  No codes.
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GTRS Fiero

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Re: Misc Fiero issues
« Reply #400 on: October 20, 2019, 09:43:00 am »
Quote from: Fierofool on October 16, 2019, 08:14:00 pm
You need an infrared thermometer to check the temperature on the thermostat housing and compare it with the gauge.

I wonder.  If the CTS and temp gauge sender show different values, what could be the cause?
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Fierofool

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Re: Misc Fiero issues
« Reply #401 on: October 20, 2019, 01:29:42 pm »
Either sensor could be inaccurate, the gauge could be inaccurate.  To determine which, remove the two sensors and allow them to equalize temperatures in the same environment.  Then, using a multimeter, check the resistance values against the chart on this forum.  If they both are close to one another, it would be the gauge.  If there's a wide difference, then one of the sensors. 
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There are three kinds of men:

1.    The ones that learn by reading.
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: Misc Fiero issues
« Reply #402 on: October 20, 2019, 01:31:36 pm »
The gauge itself is accurate, although wiring is always suspect.
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GTRS Fiero

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Re: Misc Fiero issues
« Reply #403 on: October 21, 2019, 06:13:00 pm »
Since there are oddball issues, I'm replacing the ECU.  My suspicion is that the problem is either the ECU or the chip.
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GTRS Fiero

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Re: Misc Fiero issues
« Reply #404 on: October 21, 2019, 09:14:14 pm »
The ECU did not seem to help.  New chip on the way.
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