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Old 04-14-2012, 03:49 PM   #1 (permalink)
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1980 20r truck will not start

Truck was running fine, parked it for a couple of days and now will not start. Truck cranks fine, fuel pump is pumping fuel, getting spark from coil and at plug, has new plugs, rotor button and cap, timing is set still nothing. Poored a little gas in the carb and still nothing. I've searched the post can't find anything.Been workin on this thing all day any suggestions?
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Old 04-15-2012, 11:32 AM   #2 (permalink)
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Anybody?
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Old 04-15-2012, 01:08 PM   #3 (permalink)
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Update...after using a fluke I find out that I'm only getting 9V to the ignitor durring cranking, posibly causing a weak spark. What could b the cause?
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Old 04-15-2012, 01:27 PM   #4 (permalink)
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Maybe 30 year old wiring? Bad connectons at the battery? 30 year old ignition switch? Could be a lot of things. Just start narrowing it down. First. I would try running a fused wire straight from the battery so you know your getting full voltage. Then if it starts look for what is causing the low voltage. If it still doesnt start than that may be only part of the problem or not the problem at all.
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Old 04-15-2012, 02:16 PM   #5 (permalink)
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Thanks for the reply. Tried it still nothing.
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Old 04-15-2012, 02:48 PM   #6 (permalink)
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did you try a newer battery?
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Old 04-15-2012, 03:01 PM   #7 (permalink)
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I havnt tried that...but I'm pretty much at a loss so its worth a try.
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Old 04-15-2012, 04:17 PM   #8 (permalink)
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New battery was a bust too. I'm sure its simple and I'm over looking something but until I find it any ideas are accepted.
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Old 04-15-2012, 04:23 PM   #9 (permalink)
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look at all your ground connections make sure there is good clean metal to metal contacts points
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Old 04-15-2012, 05:02 PM   #10 (permalink)
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Did that as well. Only thing I havnt checked is compression but can it loose compression over night?
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Old 04-15-2012, 09:25 PM   #11 (permalink)
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My guess is bad ignitor. I don't know shit about them. But my truck did the same thing and a junk yard ignitor fixed the issue.
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Old 04-15-2012, 11:30 PM   #12 (permalink)
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Check where the starter bolts to. Might have a loose starter, where it bolts to. Mine was way loose could take the bolt all the way out. After I fixed that it starts way easier.

Also they way you are describing the ignitor might be bad, as what RcBro said. Sometimes on my 22r when I only pour a lil of gas in carb it wont start like it should. So I pour alot more down into the carb, and that usually starts it right up.

Good luck
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Old 04-16-2012, 07:38 AM   #13 (permalink)
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Quote:
Originally Posted by charliehorse View Post
Update...after using a fluke I find out that I'm only getting 9V to the ignitor durring cranking, posibly causing a weak spark. What could b the cause?
So chase down your voltage drop? Or am I missing something?
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Old 04-16-2012, 09:25 AM   #14 (permalink)
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check the external regulator ALSO check the relay for the voltage regulator if its not working it will draw a voltage. ALSO check to see if anything is drawing power when the key is off RADIO, DOME LIGHT, if you put a aftermarket electrical product on it make sure its not getting power and drawing the battery down. but I am going to aim at the voltage regulator on the truck under the hood B/C if its not telling the alti to charge its not going to charge and the only way to make it charge is to have a closed circuit (FROM THE RELAY IN/ UNDER THE DASH) had the same problem on my 1980 truck with a 22r so I know about that area of the grid
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Old 04-16-2012, 07:24 PM   #15 (permalink)
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My guess is bad ignitor. I don't know shit about them. But my truck did the same thing and a junk yard ignitor fixed the issue.
When ur ignitor went out were u getting a week spark like I am or none at all?
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Old 04-17-2012, 05:08 PM   #16 (permalink)
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ITS ALIVE!!! Luckily I have some yota friends with a surplus of parts so I replaced the coil with a factory yota one changed the magnetic pick up in the dist and set the timing again and gave her a nice helping of gas in the carb and she fired right up. Thanks for everyones help.
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Old 04-17-2012, 06:42 PM   #17 (permalink)
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Right on, sorry didn't c ur post till now
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Old 04-17-2012, 06:46 PM   #18 (permalink)
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No prob man now that I've got it running again hopefully I can get my yota lookin like yours. Been following ur build very nice.
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