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Author Topic: Missing injector and spark pulses  (Read 17049 times)

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GTRS Fiero

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Re: Missing injector and spark pulses
« Reply #15 on: June 15, 2021, 01:27:32 pm »
What did you do?
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GTRS Fiero

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Re: Missing injector and spark pulses
« Reply #16 on: June 15, 2021, 01:29:35 pm »
I mean, how did you fix it?
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Slyp

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Re: Missing injector and spark pulses
« Reply #17 on: June 15, 2021, 01:33:17 pm »
I had it Mikes shop and we were discussing the problem.... and one of the guys sort of went and felt the exhaust pipe exhaust and said it seemed like the muffler was getting pluged.   Mike got rid of the muffler and I haven't had the problem since.     Not to say that that might be your problem
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Raydar

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Re: Missing injector and spark pulses
« Reply #18 on: June 15, 2021, 05:01:14 pm »
It was a clogged cat. I'm not sure, but some of the "cat guts" may have escaped and clogged the muffler, too. I believe you replaced it with an Ocelot system. Maybe?
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Fierofool

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Re: Missing injector and spark pulses
« Reply #19 on: June 15, 2021, 05:48:24 pm »
Mike said that whenever he handled the muffler, there was nothing coming out of it.  When the ends of my muffler started separating, I was about to order an Ocelot from TFS.  Mike told me about Bob's muffler, so I got it, installed it, and it's running just great. 
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GTRS Fiero

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Re: Missing injector and spark pulses
« Reply #20 on: June 15, 2021, 06:27:28 pm »
Why would the exhaust make the ignition pulse be erratic?
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Slyp

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Re: Missing injector and spark pulses
« Reply #21 on: June 16, 2021, 11:13:54 am »
Your right it was Ocelot Performance Cat.  Not cheap but problem is gone along with the muffler
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Fierofool

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Re: Missing injector and spark pulses
« Reply #22 on: June 16, 2021, 01:07:41 pm »
Quote from: GTRS Fiero on June 15, 2021, 06:27:28 pm
Why would the exhaust make the ignition pulse be erratic?

Probably wouldn't.  That got overlooked.  Often we, and that includes me, on this forum and PFF fail to read the whole thread for previous comments and suggestions, especially when it's a multi-page thread.  The symptoms were probably similar, both resulting in the loss of power.  I think in Slyp's case, none or very little of the converter guts got down into the muffler.  It seems to have clogged at the outlet of the converter.  I think the converter was temporarily changed to a test pipe. 
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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: Missing injector and spark pulses
« Reply #23 on: June 16, 2021, 06:08:22 pm »
My cat is clean.  My muffler is also good.
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Wreck It Ralph

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Re: Missing injector and spark pulses
« Reply #24 on: June 16, 2021, 06:45:27 pm »
I read that and I could think was the scene from one of the poltergeist “this house is clean!”
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1988 Fiero Base 4cyl 5spd.
1986 Fiero GT ... Parting out. Let me know if you need something.

GTRS Fiero

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Re: Missing injector and spark pulses
« Reply #25 on: June 16, 2021, 07:00:35 pm »
Just going back, this issue seems to have started shortly after adding the heat shield below the ICM.
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Wreck It Ralph

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Re: Missing injector and spark pulses
« Reply #26 on: June 16, 2021, 11:13:25 pm »
I solved some and created others when adding my shield.
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1988 Fiero Base 4cyl 5spd.
1986 Fiero GT ... Parting out. Let me know if you need something.

GTRS Fiero

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Re: Missing injector and spark pulses
« Reply #27 on: June 17, 2021, 08:14:10 am »
Maybe a grounding issue?
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GTRS Fiero

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Re: Missing injector and spark pulses
« Reply #28 on: June 20, 2021, 06:48:09 am »
Quote from: Wreck It Ralph on June 16, 2021, 11:13:25 pm
I solved some and created others when adding my shield.

That's a bit vague.
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GTRS Fiero

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Re: Missing injector and spark pulses
« Reply #29 on: June 21, 2021, 06:30:48 pm »
Well, I've sortof hit a snag.  My Fiero drives fine--for 4-5 miles, then starts missing.  Everything to the ICM is good, but garbage coming out, at this point.  If I let the Fiero sit for a few minutes, it runs fine--for another 4-5 miles.  If I cool the ICM, the Fiero runs fine.

It seems that the ICM is overheating.
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