No spark

[logan]

Let me check and see if I have a test light.

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No test light. I'll pick on up when I go to town today.

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[logan]

No thick wire is 12v+ check it with a test light grounded light should light with key on engine off. Grounded test light to green and yellow wire should flash on and off as the engine is cranking. Pull the coil wire so the engine doesn't start I held my coil wire 1/8 inch from engine ground while cranking to protect my igniter, some vehicles are sensitive to cranking with no coil lead.

Update: black wire constant light. Yellow/green- nothing even while cranking.

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[ryanprins13]

Ryan gets the search pirze. I'm no good at it. Good work.

. So in this thread I have physically gone to one of my cars and tested for A/C signal from a known good distributor, have come up with a test thatalthough it works will destroy a noid light that has served me well for 15 years if done to a running car. I have taken a spare dist apart to examine how things work in these dizzys, come up with a simple test with a simple 12v test light that just for fun I checked with the vehicle running also it does not go off like a flashbulb,I think I have figured out how to sub a gm 4wire ICM as a test unit. And learned that ryann knows how to search like a boss and Wm and I suck at it.

Normally i can search on here for half an hour and not find what i need, but this time was easy. So In the interest of continued learning- i clicked on WmWatt's name to go to his forum profile. It said he had 2597 posts. I clicked on that and there was 2 options. One was threads started by him and the other is threads he replied to. I clicked on the threads he started, scrolled down to march and there it was!

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[ryanprins13]

I replaced to ICM just to rule it out.

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Does anyone know the difference in the optical ad hall type distributor? Are they interchangeable?

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I dont. this probably wont help you but i want to understand the differences too. So could you post a photo of your new icm bolted down and plugged in to where its supposed to be with a bit of the surrounding area so i can tell where it is. Then another photo of your distributor? Tonight or tomorrow morning i will look at both my festivas and see what they got and if they are different than eachother or yours. I have also pulled distributors as spares since my one died. I think i have 3 spares. I need to know if their all the same, lol

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[logan]

I dont. this probably wont help you but i want to understand the differences too. So could you post a photo of your new icm bolted down and plugged in to where its supposed to be with a bit of the surrounding area so i can tell where it is. Then another photo of your distributor? Tonight or tomorrow morning i will look at both my festivas and see what they got and if they are different than eachother or yours. I have also pulled distributors as spares since my one died. I think i have 3 spares. I need to know if their all the same, lol

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Yes,I won't get off work until midnight but I will get them.

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[ricko1966]

There are 3 different ones that I have had. I was only aware of 1 with an external igniter. That was the style I was testing on 91 EFI 5speed car

[logan]

Here is a stock image of the ICM I replaced I have since take it back.

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[WmWatt]

Logan. I think someone is asking if the distributor is rotating. Perhaps that could be confirmed by removing the cap, touching the starter briefly, and seeing if the rotor moves?

[logan]

As requested.

Also yes it is turning.

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[logan]

Also replacing the distributor did not change anything.


Can anyone verify if there should be voltage to it with the key on?

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[dalebwilson]

Recently I had a no spark condition that I could not pin point. By luck, I found a loose connection in the plug to the ICM. One of the pins was loose and would only intermittently provide current. While the engine was running, you could touch the plug and the engine would die.


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[ricko1966]

Did this car actually have a blown head gasket?Is your engine block grounded? Do you have a chassis ground?Take a jumper cable from battery negative to a good ground on the head the other jumper cable from the battery negative to an upper strut mount bolt. See if your spark comes back.You may have to check the harness for continuity,but I find it hard to believe the thing ran until it blew a hadgasket, the headgasket was replaced and in the interem another part failed or the harness developed an open. My gut says you left something disconnected.I can teach you some tricks about checking the harness,but retrace your steps first.

[ryanprins13]

There are 3 different ones that I have had. I was only aware of 1 with an external igniter. That was the style I was testing on 91 EFI 5speed car

I looked at mine this morning. on both my cars the components around the coil are the same and the distributor appears the same as the photos logan posted, also the one spare distributor I found looked the same. Can you tell or show me/us what the differences are between these 3 different kinds?

Also replacing the distributor did not change anything.


Can anyone verify if there should be voltage to it with the key on?

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Lame, Im not sure if I asked before but have you taken a test light to your interior fuses? specifically the one labled 'engine'. Just wondering if your getting power to all of them as well as through them.
I was sent a link to the evtm last year but I couldn't find the post back now. Ill have to look again later.

[ryanprins13]

Just found this, its even a sticky... didn't read it but maybe it helps in some way. https://fordfestiva.com/forums/showt...ributor-tester

[logan]

Did this car actually have a blown head gasket?Is your engine block grounded? Do you have a chassis ground?Take a jumper cable from battery negative to a good ground on the head the other jumper cable from the battery negative to an upper strut mount bolt. See if your spark comes back.You may have to check the harness for continuity,but I find it hard to believe the thing ran until it blew a hadgasket, the headgasket was replaced and in the interem another part failed or the harness developed an open. My gut says you left something disconnected.I can teach you some tricks about checking the harness,but retrace your steps first.

There's a ground from the engine block to the strut mount that looks factory.

What could be left unhooked. There's very few connections when pulling the motor and being as I have double checked them all and this is the second motor I have pulled and reinstalled I highly doubt this is the issues. But I'm more than welcome to try anything.

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