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PostPosted: Tue Mar 26, 2019 8:28 am 
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howdy, all!

recently acquired an 80 Luv as project. engine cranks fine but no spark from distributor cap to plugs. i have spark from the coil to the cap, but no spark coming out of the cap plug terminals to plugs. friend mentioned that potential culprit could also be a crank sensor(?). does the luv have a cranks sensor, and location of said sensor?

any advice would be greatly appreciated.


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PostPosted: Tue Mar 26, 2019 1:49 pm 
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No crank sensor on these antiques. The points could be stuck closed....

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PostPosted: Tue Mar 26, 2019 1:55 pm 
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we checked the points....turned the engine few times while dist cap was off and points were opening / closing.
thanks for responding


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PostPosted: Tue Mar 26, 2019 3:58 pm 
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If spark makes it to the cap but not out the only 2 items are the cap and rotor.

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PostPosted: Tue Mar 26, 2019 4:03 pm 
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thanks for responding.
those were my initial thoughts also...so i replaced cap and rotor with new. still no spark.
thanks again.


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PostPosted: Tue Mar 26, 2019 5:29 pm 
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So, you have spark at the coil wire at the cap?

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PostPosted: Tue Mar 26, 2019 8:05 pm 
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Yes


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PostPosted: Tue Mar 26, 2019 9:56 pm 
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Obviously there is something between the cap and rotor is wrong. Check the rotor with a VOM and same with the cap. Make sure the cap has the spring and carbon tip

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PostPosted: Wed Mar 27, 2019 1:47 am 
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When that happened to me in my luv where I wasn't getting any spark to the plugs it turned out to be the points that were bad in mine. Try replacing the points on the distributor not expensive I believe I paid 3 dollars for the points at auto zone. Also just make sure you have good ground to the engine block so the current has a path to ground and travels through the wire to the spark plug thus giving it the spark.


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PostPosted: Wed Mar 27, 2019 7:31 am 
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Luvrv8 wrote:
Obviously there is something between the cap and rotor is wrong. Check the rotor with a VOM and same with the cap. Make sure the cap has the spring and carbon tip


will do. but if am checking the rotor with VOM, what info am i looking for? seems that the cap would need to be off while i cranked the engine - thereby negating any juice that may be coming to rotor.
thanks


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PostPosted: Wed Mar 27, 2019 7:33 am 
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78orangeluv wrote:
When that happened to me in my luv where I wasn't getting any spark to the plugs it turned out to be the points that were bad in mine. Try replacing the points on the distributor not expensive I believe I paid 3 dollars for the points at auto zone. Also just make sure you have good ground to the engine block so the current has a path to ground and travels through the wire to the spark plug thus giving it the spark.


will do. the old guy that had the truck previously indicated he had changed points but i will move forward on replacing as well to confirm (and ease of mind). i ordered a shop manual for this truck, awaiting arrival....you happen to know the what the gap setting would be on the points?
thanks


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PostPosted: Wed Mar 27, 2019 2:39 pm 
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Starting at the coil you need 12 volts at the positive terminal with the ignition on. Have someone wearing a glove hold a spark plug pushed in the coil wire to the side of the intake to achieve a grounding of the spark plug. Remove the wire for the negative terminal of the coil. Take a wire from the negative terminal and tap it to the side of the negative terminal with the ignition on. When you tap the wire to the ground, you should get a blue, or very white spark at the plug. If this works the coil and supply to the coil is good.

Remove the test wire form the coil, remove the black wire at the points. read from the wire where it connectes to the point to the wire you removed from the negatinve side of the coil. There should be continuity on this wire. Reconnect the wire you removed from the points, reconnect the wire you remove from the negative to the coil. Get a plastic knife. Its better to do the next part when it is dark.

Have your friend hold the plug where you got the blue spark to the side of the motor. if you take the plastic knife and open and close the points, you should get a spark at the points, and a spark at the plug as the point close.


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PostPosted: Wed Mar 27, 2019 3:02 pm 
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The coil wiring picture, for single points.


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PostPosted: Wed Mar 27, 2019 3:05 pm 
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The coil wiring for dual points.


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PostPosted: Wed Mar 27, 2019 3:07 pm 
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some distributor pictures.


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PostPosted: Wed Mar 27, 2019 3:18 pm 
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points gap for dual points .018 to .022
series 3 and 4 .018 to .022
series 5 and 6 .016 to .020


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PostPosted: Wed Mar 27, 2019 3:22 pm 
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single points.


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PostPosted: Thu Mar 28, 2019 7:44 am 
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RedSwampFrog wrote:
single points.


thanks for all info/pics.

have the single points situation here. will attempt efforts you've suggested. by the way, points should be gapped at the 'high point', correct?
thanks again


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PostPosted: Thu Mar 28, 2019 9:58 am 
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Correct


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PostPosted: Thu Mar 28, 2019 6:51 pm 
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Also note the gap or dwell will affect the timing, reset the timing after you have the dwell or gap correct.


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