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Author Topic: My Misc Fiero issues  (Read 126284 times)

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GTRS Fiero

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Re: Misc Fiero issues
« Reply #540 on: November 10, 2020, 07:00:54 pm »
The oil pump drive has leaked a bit, so the seal was replaced, again.
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GTRS Fiero

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Re: Misc Fiero issues
« Reply #541 on: November 16, 2020, 02:44:49 pm »
Well, that noise Scott heard was not the injectors; it was the lifters, or rather, lifter.  On cylinder #5, the oil tip on the pushrod, and a bad rocker.  So, replacing those.
« Last Edit: November 18, 2020, 06:50:40 pm by GTRS Fiero »
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GTRS Fiero

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Re: Misc Fiero issues
« Reply #542 on: November 17, 2020, 07:08:40 pm »
All back together.  The power is back, and it isn't running as rich.  It is more peppy off the line, has a lower idle, and does not try to die.
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GTRS Fiero

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Re: Misc Fiero issues
« Reply #543 on: November 17, 2020, 07:31:13 pm »
The rocker seems to have had a manufacturing defect.  When replacing the rod, we tightened it by 1/4 turn.

No more clickety-clack.
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GTRS Fiero

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Re: Misc Fiero issues
« Reply #544 on: November 18, 2020, 06:52:38 pm »
The lifters were fine.  The rocker had a manufacturing defect.
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GTRS Fiero

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Re: Misc Fiero issues
« Reply #545 on: November 22, 2020, 08:10:20 am »
Quote from: GTRS Fiero on November 15, 2017, 08:01:35 pm


I had thought this was caused by being too tight, but now I'm being told that it is caused by being too loose.  Which is it?
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TopNotch

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Re: Misc Fiero issues
« Reply #546 on: November 22, 2020, 09:06:36 am »
I would think that either too tight or too loose could cause damage. In the too loose case, parts will bang together (noisy valve train sounds).
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GTRS Fiero

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Re: Misc Fiero issues
« Reply #547 on: November 28, 2020, 10:01:04 am »
While messing around in my engine bay, I saw that the year-old plug wires have bad spots in the insulation.  Not cuts, and not cracks, but something that penetrates the outer layer.  That can't be good.

These are custom wires.  Joy.
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The Art Doctor

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Re: Misc Fiero issues
« Reply #548 on: November 28, 2020, 02:33:47 pm »
I have an idle question. I had to pull the distributor today. Not sure if this is related. After putting it back in and timing the motor I am again having a high idle around 1500. It is at least stable. However, if I ground out the diagnostic port idle goes back to you around 1050. This is where it was before I took out the distributor. Why does grounding out the diagnostic port fix the high idle what is this a symptom of?
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GTRS Fiero

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Re: Misc Fiero issues
« Reply #549 on: November 28, 2020, 02:38:55 pm »
Well, it could be a vacuum leak (EGR tube), but I suspect a sensor.  Either the O2 sensor, or the CTS.  Another possibility is the MAP sensor.  You can unplug the MAP sensor, to test, but that will throw a code you'll have to reset.

When you put the ECU in diagnostic mode, it ignores the sensor input, and runs on pre-determined values.
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Fierofool

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Re: Misc Fiero issues
« Reply #550 on: November 28, 2020, 04:29:29 pm »
I just pulled my distributor to replace the O-ring seal.  I very carefully indexed my distributor and marked it for timing location.  After the reinstall, the engine idled at about 1500.  It also had a noticeable stumble upon acceleration, but then it would go.  Idle rpm would waver at operating temperature. 

Due to the stumble, I decided to advance my timing just a hair.  I know that advancing timing will often increase rpm at idle, but in my case, it dropped it back to around 1050 where it normally idles and the rpm wavering also went away.  Well, almost.  Maybe a 50 rpm variance. 
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GTRS Fiero

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Re: Misc Fiero issues
« Reply #551 on: November 28, 2020, 04:31:49 pm »
Could the high idle be caused by a valve not being fully closed?
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Fierofool

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Re: Misc Fiero issues
« Reply #552 on: November 28, 2020, 04:37:34 pm »
What valve would that be? 
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There are three kinds of men:

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2.    The few who learn by observation.
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GTRS Fiero

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Re: Misc Fiero issues
« Reply #553 on: November 28, 2020, 04:41:45 pm »
Well, just wondering how the timing would change idle.

The strokes, are intake, compression, power, and exhaust.  Now that you mention it, the valves should be closed, by then.
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The Art Doctor

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Re: Misc Fiero issues
« Reply #554 on: November 28, 2020, 05:17:32 pm »
I did the o ring thing too.  No more leaks.  I changed the ICM too.  Forgot to add that.  Could that have been it?  Seems to have fixed the stumble but I wont know till I put a few more miles on it.  I also did a incoming air reset trying to fix it but did not help.  I disconnected the battery during the removal but obviously had to reconnected to get it to run again. Just tried timing it again and now its terrible.   Should I set timing with diagnostic grounded or open?
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