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95 Geo Metro dies while driving
Topic Started: Sep 27 2017, 01:23 PM (3,430 Views)
freegeo
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clc
Nov 3 2017, 11:24 AM
I have cycled the key.
Now it's starting fine even though the fan turns "on" while before it was not the case. Still high idle and surging.
Is this with a warmed up engine?
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clc
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Ever since I started it this morning it has started every time.
Cold or warm.
At no time today it has reached running temperature. It has gotten a bit warm. I have not run it long enough to reach temperature.
I just started it now and temp gauge was at "C", but RPM was 600.
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freegeo
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The rpm was 600 when it 1st started. Didn't start at 1800 then go down to 600 as it warmed up?

Did this issue start right after the injector was changed? After the TPS was adjusted? What brand of injector was put in?
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clc
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No, it does not go to 1800 then idles at 600. The last few times it has started it's been a bit rough and have to give gas to get it going, then idles at 600. The injector I got from ebay, made by AutoExtra.
I had the surging with the old injector, seldom the low idle.
The TPS adjustments were made with the old injector and also with the new one.
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freegeo
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You may have more than 1 issue. There seems to been done sort of wiring or electrical problem.
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clc
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I'll reiterate a brief summary of symptoms and what I've done.
Originally surging. In mid drive I'd turn the engine off and re-start it and surging would stop and idle normal. One day while driving it died on me and would not start. Had it towed home. One hour later it started with no issues. It died on me while driving again and ever since I've been trying to fix it.
Cleaned EGR valve, replaced PCV, fuel injector, replaced all small vacuum hose. Others OK.
Adjusted TPS.
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freegeo
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Normally a surging idle will have to do with the tps.
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clc
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Will a new TPS solve both the surging and low idle?
This one on ebay is very cheap. Is it worth it to get one for a diagnostic?
EBay Link

Thanks,
CLC
Edited by Metromightymouse, Nov 3 2017, 08:18 PM.
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freegeo
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clc
Nov 3 2017, 06:10 PM
Will a new TPS solve both the surging and low idle?
This one on ebay is very cheap. Is it worth it to get one for a diagnostic?

Thanks,
CLC
Can't say a new one would fix it. Let me look into the ISC code. It has the closed throttle switch in it.

Edited by Metromightymouse, Nov 3 2017, 08:19 PM.
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clc
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Just a reminder... at idle there is no gap between the ISC and the throttle stop. Actually the piston? of the ISC is pushed in by the throttle stop.
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freegeo
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clc
Nov 3 2017, 06:36 PM
Just a reminder... at idle there is no gap between the ISC and the throttle stop. Actually the piston? of the ISC is pushed in by the throttle stop.
No gap when it is idling at 600 rpm? I will have to look at mine and see what it does.
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Metromightymouse
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Powdercoat Wizard

I would suggest unplugging the ISC when it's fully retracted to remove it from the possible issues. I drove mine for quite a while without it, just have to get it warmed up enough to run in the morning.
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freegeo
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clc
Nov 3 2017, 06:36 PM
Just a reminder... at idle there is no gap between the ISC and the throttle stop. Actually the piston? of the ISC is pushed in by the throttle stop.
I'm not sure there should be a gap. The ISC plunger is what pushes the throttle open to the desired rpm.
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freegeo
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Use the diagram and see if you can check a couple of things.

Check the reference voltage at the ISC with the connector unplugged and the key on.

Check the voltage at the black/blue wire with the connector plugged in and the key on. With the throttle at idle you should have 0 volts. Press the throttle and the voltage should go to 5 volts.

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Edited by freegeo, Nov 4 2017, 12:38 AM.
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clc
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The light green wire measured 5V. The black and blue I did not get a reading.
I also tried the suggestion from Metromightymouse above and disconnected the ISC after it reached temp and it ran just the same. Idle at 600.
I checked the codes and got
23--IAT...Intake Air temperature Sensor circuit – High Voltage Input. Low temperature indicated.
46--Idle Speed Control Motor circuit.
PS There was a gap at the idle stop this morning.
Edited by clc, Nov 4 2017, 11:16 AM.
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