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Missing a secondary ignition on the Hantak 1008C but primary voltage is there

  • Batiscafo
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01 Dec 2019 23:34 #35505 by Batiscafo
I have a Six cylinder 1995 4Runner and lacks power. Just changed the secondary wires, plugs and with the Hantek 1008C and the HI Volts probe and the primary coil voltage gives me a cylinder that seems to have no spark.
I cannot make sense of what is wrong. I though it could be the FET at to ECM but if the primary voltage is there how can that be?

Any suggestions?
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02 Dec 2019 04:34 #35509 by Andy.MacFadyen
Don't see many 6 cylinder 4Runners but if it has a distributor like most Japanese cars of that era then it looks like the secondary voltage is going straight to ground via the cap. New cap and rotor arm should be the next step.

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The following user(s) said Thank You: Noah

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03 Dec 2019 08:24 #35537 by Batiscafo
Thanks and you maybe right. After lots of reading and analyzing and reading code I think is the distributor that is not producing the signals as normally should do and is is in :”limping mode” if there is such thing in OBD-1.
They say to No disassemble it !!!
I will try to see if the scope gets it, then maybe get a scrap yard one and take this apparat.
It has new rotor, plugs, wires.
Thanks for your time.
I need a schematic diagram of the controls. Any help with that? Bought Hyness but nothing there for the 3 litter engine 3VZ-E

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03 Dec 2019 08:26 #35538 by Batiscafo
Forgot (80 years old), has codes: 12; 14; 24 of OBD-1

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03 Dec 2019 12:11 - 03 Dec 2019 14:34 #35542 by Andy.MacFadyen
If you have primary its a secondary fault the high voltage is arcing to ground, the distributer cap will likely have a crack close examination of the cap (or may not) reveal a trace of the path the spark is taking. Once the spark has found the path of least resistance the path becomes carbonised and the misfire will continue to take the path of least resistance. It is normal practice to replace the didtributor cap and rotor arm as a pair.

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Last edit: 03 Dec 2019 14:34 by Andy.MacFadyen.

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07 Dec 2019 00:10 #35603 by Andrewjames
Is this the diagram you're looking for?
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08 Dec 2019 16:18 #35644 by Deltron
I'd want to see an amperage overlay before buying parts

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09 Dec 2019 01:57 - 09 Dec 2019 02:14 #35667 by Andy.MacFadyen
This is a simple computer coil and distributer system the coil, the coil driver and the cam postion sensor are common to all cylinders. The fault codes are reporting that the engine computer is not detecting a spark event from the secondary side of the coil driver. On the oscilloscope caputure for the misfiring cylinder the coil dwell period can be clear seen but only spark event is missing this indicates a secondary ignition short to ground. As it is a single cylinder miss and the coil is firing on the other 5 cylinders it points to the distributer cap, plug wire and spark plug.

www.picoauto.com/library/automotive-guid...sts/primary-voltage/





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Last edit: 09 Dec 2019 02:14 by Andy.MacFadyen.

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