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Discussion Starter #1
Hello all i was needing some help or pointers on why my truck turns off when it gets to opperating temp. it will stat fine when cold but then dies when hot. we checked the spark when it dosnt want to start and it will throw a small spark 1-2twice every 5 cranks
it is an 84 4x4 with the carb'd 4cyl any other info you need pelese ask thank ypu
 

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Benwill1
80's toys
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Are you checking the coil wire or a spark plug wire?? Coil,pick-up, or "igniter"..Toyota's name for eletronic ignition box under the coil, will cause low spark.
 

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Discussion Starter #3
well both times when it was cold spark was strong (checking from #1 plug) it has no problem starting or reving when cold but right when it gets to about 160 it spudders and dies and wont start untill cool i unpluged the o2 just to see if anything happens and nothing. its getting gas just something is telling it to die and not start untill cold. and like above when it is hot checking #1 it will hardly spark every 5-10seconds but wont turn over
 

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Benwill1
80's toys
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If you suspect ignition problems, you can check the coil and igniter with an Ohm meter. across the low voltage should be .4-.5 Ohms. From the + side, should be the brown wire, to the high voltage side should be 8.5-11.5 Ohms. Go to the Helpful links section of this forum. In the 4th post, you can download a factory service manual. It will have how to test the igniter. I would do the checks cold, then crank it up and run it till it cuts off, then check them again.
 

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I worked on one that had a very similar symptom, would run good when cold but after it got hot it would just up and die, no spark, would restart after it cooled off. It was the pickup coil inside the distributor.
X2

Check the resistance of the signal generator (pick-up coil). It should be 140-180 ohms at the green connector from the distributor side. Measure it AFTER the truck has warmed up.
 

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It sound like the pick up coil is bad, there not hard to replace, and they cost about 45 dollars.
 

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Discussion Starter #9
we replaced it with a new one (pick up coil_... still same problem and right before we replaced it it wouldnt start at all.. and the ignitor box is 276-320$ WTF?
 

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we replaced it with a new one (pick up coil_... still same problem and right before we replaced it it wouldnt start at all.. and the ignitor box is 276-320$ WTF?
Did you test the resistance of the pickup coil before you replaced it? Don't throw parts at the truck based on our info without testing them. Test the components first, THEN replace the one(s) that are faulty.

Test the ignitior before replacing it!!! Your problem may just be a faulty ignition coil, which will only run in the neighborhood of $20.
 

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we replaced it with a new one (pick up coil_... still same problem and right before we replaced it it wouldnt start at all.. and the ignitor box is 276-320$ WTF?

I agree with qsd-dan, test the parts before replacing, it wouldn't run at all, then you replaced the pickup coil and it would run, but dies after gets warm, possibly a faulty pickup coil you installed.
 

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Discussion Starter #12
so we got an new VR. Coil. and pick up coil id ont really know how to check car leectrical systems but checking for power out of the two wires that plug into the coil are hot right when you turn the key on tehn if you test the volts coming out of the coil when cranking it meeter dosnt spike or rase.. we did find that if you ohm the cap rX1.000 it dosnt go back to zero maybe half way like it isnt getting good connecting threw the cap to the rotor.... this has got me stumped.. shouldnt the volts peak out when cranking or go dead while the pick up coil isnt ingagued?
 
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