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Author  [Modern View]

05-22-2020 20:23:59

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cant get distributor to fire I take coil wire off it will spark a half inch away from motor but when I plug it into distributor cap don't get spark at plugs has new cap and points in it

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wore out

05-24-2020 09:17:27

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 Re: 2010 in reply to rickymotorbrains, 05-22-2020 20:23:59  
It's possible the cap or rotor or both are mi-matched to your distributor.

The tip of the rotor needs to be near a high-tension terminal when the points open and spark occurs.

If you do not have the exact, correct cap and rotor for your distributor and spark occurs when the rotor is on between high tension terminals you are not going to get a reliable spark out of the cap.

Also, are you using the original breaker points setup or an aftermarket EI?

If you put the incorrect EI module in a distributor that's otherwise "correct" the same thing can happen... spark occurring when the rotor tip and a high-tension terminal are not lined up.

I have a "distributor machine" and a variety of caps I've cut a viewport in with a hole saw and can visually check where the rotor is when spark occurs. You want it to be at the leading edge of the high tension terminals, it will travel to the middle and eventually to the trailing edge as distributor seed is increased and the centrifugal advance operates.

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David G

05-24-2020 10:41:01

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 Re: 2010 in reply to wore out, 05-24-2020 09:17:27  
That is a good point, an incorrectly aligned EI module can cause spark to occur where there is no where for it to reach plugs. I do believe the OP indicated points.

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David G

05-24-2020 08:54:50

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 Re: 2010 in reply to rickymotorbrains, 05-22-2020 20:23:59  
Points, condenser and coil are fine if spark out of tower, I would expect a rotor issue.

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05-23-2020 07:45:27

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 Re: 2010 in reply to rickymotorbrains, 05-22-2020 20:23:59  
It would seem the points and condenser would be working as he posted there is a 1/2" spark from the coil wire to the block when cranking. If it makes that spark at the distributor end of the coil wire (secondary voltage), it would seem the problem is in the distributor where that spark gets distributed to the cylinders. To me that is either a bad cap or a bad rotor button, maybe both, the two components that handle the secondary voltage. Try putting the old cap back on. Do you see any carbon tracking on the cap or rotor button? Did you put the dust shield back in if it had one? Is the button contact in the center of the distributor cap for the rotor contact to rub? Is the rotor contact in place?

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05-23-2020 05:38:28

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 Re: 2010 in reply to rickymotorbrains, 05-22-2020 20:23:59  
Are the points clean, no oil on them, gapped correctly?

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05-23-2020 06:59:29

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 Re: 2010 in reply to J.Wondergem, 05-23-2020 05:38:28  
yes there right

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05-23-2020 04:46:34

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 Re: 2010 in reply to rickymotorbrains, 05-22-2020 20:23:59  
As Roger posted, check the rotor button.

If the wire from the coil to the distributor will spark at the distributor end when it is held 1/2" from the block; that pretty much leaves a wrong or bad cap or the rotor button. If the rotor button wasn't fully seated, or the cap was wrong, I've seen buttons broken from contacting cap posts. I've seen caps missing center posts.

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Roger in Iowa

05-23-2020 03:02:32

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 Re: 2010 in reply to rickymotorbrains, 05-22-2020 20:23:59  

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