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Originally Posted by danthurs
(Post 3633)
Well, after 2 weeks and no problems, today that changed. I struggled to get the truck home. It fought me the whole way but I made it. It totally died in the shop and wouldn't restart. Then I noticed with the engine off and key in run, the tack was jumping around, and I noticed a arching sound from under the hood. I jumped out and tried to find it. It was coming from that area of the coil, rear left side. But stopped before I could find it. I suspect what ever was making that sound is the source of my problem. The the truck restarted and ran fine. I tapped all around and nothing happened. Any thoughts on what I should be checking here?
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I plan to pull the coil off and inspect it tomorrow. Something is aching to ground and it's causing the tach needle to jump. I'm thinking there may be a crack. I may end up just replacing the coil.
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5 Attachment(s)
I decided to replace the coil. I was driving back from the DVM and autozone was right there, so I stopped and picked one up.
Attachment 1524 I tested the secondaries on the new coil. Attachment 1525 And tested the primaries. Attachment 1526 Then I tested the primaries on the old coil. Attachment 1527 And the secondaries on the old coil. Attachment 1528 Hmm, wonder what is wrong? |
Originally Posted by danthurs
(Post 3651)
I decided to replace the coil. I was driving back from the DVM and autozone was right there, so I stopped and picked one up.
http://i863.photobucket.com/albums/a...0/DSC04322.jpg I tested the secondaries on the new coil. http://i863.photobucket.com/albums/a...0/DSC04331.jpg And tested the primaries. http://i863.photobucket.com/albums/a...0/DSC04332.jpg Then I tested the primaries on the old coil. http://i863.photobucket.com/albums/a...0/DSC04333.jpg And the secondaries on the old coil. http://i863.photobucket.com/albums/a...0/DSC04334.jpg Hmm, wonder what is wrong? Looks like the secondary is open. Does it run now? |
Yes, but it was running before, not sure how it could run with the secondaries open. I tested it several times, even used a file to clean up the metal and make a good connection. I would expect a open to not run at all.
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Originally Posted by danthurs
(Post 3655)
Yes, but it was running before, not sure how it could run with the secondaries open. I tested it several times, even used a file to clean up the metal and make a good connection. I would expect a open to not run at all.
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That's a possibility. Perhaps it had a very weak spark. Then from time to time dropped out all the way. All I can do now is drive the truck and see what happens. I thought for sure I found the problem being a loose plug on the fuel pump. Ran problem free for 2 weeks. Perhaps the arching I heard was inside the coil.
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I tested the old coil wrong. I should have tested from tach terminal to the post. Testing that way I get about 7.70 ohms. When I heat the coil up it goes over 8.50 ohms. The new coil starts about the same place, 7,.70 ohms. When heated up I go to a bit under 8.10
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Originally Posted by danthurs
(Post 3659)
I tested the old coil wrong. I should have tested from tach terminal to the post. Testing that way I get about 7.70 ohms. When I heat the coil up it goes over 8.50 ohms. The new coil starts about the same place, 7,.70 ohms. When heated up I go to a bit under 8.10
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Ya, hard to say. But I really can't figure out why the ignition is kicking out. Something in that area was arching. There are a few plugs in that area, but I don't see any problems there. Only high energy I see is the coil. There may still be a crack in the old coil, I just can't say. If I ever get a chance I may have to put the old coil back on and start it up at night. Then mist the coil and look for any flashing.
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