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Author Topic: Missing injector and spark pulses  (Read 17052 times)

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Fierofool

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Re: Missing injector and spark pulses
« Reply #45 on: July 05, 2021, 07:06:42 pm »
Any time there is high resistance in an electric circuit, heat increases.  Larger gauge wire, if possible, might work, though the harness plug should have the correct gauge. 
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GTRS Fiero

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Re: Missing injector and spark pulses
« Reply #46 on: July 05, 2021, 08:00:48 pm »
Tried changing plug wires.  Hmmm.  There were some issues with the wiring on one of the harnesses to the ICM.
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GTRS Fiero

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Re: Missing injector and spark pulses
« Reply #47 on: July 09, 2021, 09:37:50 pm »
Well, new, expensive thermal transfer grease installed.  Found a bolt in one tire, so had to fix that.  When the rain stops, I'll take the Fiero for a drive.
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GTRS Fiero

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Re: Missing injector and spark pulses
« Reply #48 on: July 10, 2021, 04:54:50 pm »
There have been some storms, power outages, and cottonwoods falling.  Considering that the cottonwood blocking the road is laying on the ground, and has a diameter greater than the height of my Fiero, it is likely that I won't be going anywhere for a bit.
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GTRS Fiero

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Re: Missing injector and spark pulses
« Reply #49 on: July 11, 2021, 11:56:10 pm »
I'm wondering if the issue could be resistance in the wiring.
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GTRS Fiero

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Re: Missing injector and spark pulses
« Reply #50 on: July 12, 2021, 08:26:12 pm »
Any ideas?
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Wreck It Ralph

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Re: Missing injector and spark pulses
« Reply #51 on: July 12, 2021, 09:31:15 pm »
Do you have a megger? Weak insulation can be a big problem. I’ve megged out a lot of old wiring and found problems a lot faster. I actually did it today on a tow behind turbine blower.
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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 #52 on: July 12, 2021, 10:14:48 pm »
Megger?
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Wreck It Ralph

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Re: Missing injector and spark pulses
« Reply #53 on: July 12, 2021, 10:41:25 pm »
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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 #54 on: July 12, 2021, 11:04:28 pm »
I don't have one of those.  I do have a multi-meter that tests for resistance.  What's the diff?
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Wreck It Ralph

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Re: Missing injector and spark pulses
« Reply #55 on: July 12, 2021, 11:11:29 pm »
This test for failed insulation too. If the insulation gets thin on two wires they can arc or cause interference. It’s also a good tool to check for shorts to ground. I normally use this for hvac compressors or motor windings. But the applications are endless.
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1988 Fiero Base 4cyl 5spd.
1986 Fiero GT ... Parting out. Let me know if you need something.

TopNotch

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Re: Missing injector and spark pulses
« Reply #56 on: July 12, 2021, 11:19:49 pm »
Quote from: GTRS Fiero on July 12, 2021, 11:04:28 pm
I don't have one of those.  I do have a multi-meter that tests for resistance.  What's the diff?
Though I don't have one, I would imagine that the insulation test involves a resistance test using a higher voltage than a regular ohm meter.
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Wreck It Ralph

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Re: Missing injector and spark pulses
« Reply #57 on: July 13, 2021, 01:08:39 pm »
It puts a high DC voltage through the line and looks for it on other lines. So yes everything has to be unplugged.
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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 #58 on: July 13, 2021, 06:39:34 pm »
Hmmm.  I was going to just unplug one wire at a time, both ends, to test.  Am I missing something?
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Wreck It Ralph

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Re: Missing injector and spark pulses
« Reply #59 on: July 14, 2021, 11:01:26 pm »
It’s just for when you are getting picky. These wires are so small compared to what I’m testing daily. Normally I’m checking for high voltage jumps but I can show me where one wires signal can be affected by another. A simple pin out test may be all you need. Hopefully next week I can tackle my problem.
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1988 Fiero Base 4cyl 5spd.
1986 Fiero GT ... Parting out. Let me know if you need something.
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