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2001 Oldsmobile with a gm 4.3 no spark

  • EricGoodrich
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15 Aug 2019 09:36 #32836 by EricGoodrich
2001 Oldsmobile with a gm 4.3 no spark was created by EricGoodrich
No spark from coil. Everything I've checked is good. Timing signal to ignitor, control from ignitor to coil, power at coil, no voltage drop in circuit, current ramp is a square rather than a ramp which tells me the coil is shorted but it isn't. A new coil did not fix the vehicle. Any ideas?

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  • Chad
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15 Aug 2019 11:06 #32837 by Chad
Replied by Chad on topic 2001 Oldsmobile with a gm 4.3 no spark
Can you post a screenshot of the coil current and voltage waveforms?

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15 Aug 2019 12:07 #32838 by EricGoodrich
Replied by EricGoodrich on topic 2001 Oldsmobile with a gm 4.3 no spark
Thank you for your reply. Unfortunately I don't. I used my vantage pro instead of my Pico since the car is beached out in the back lot. Consequently I do not have any screenshots.

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15 Aug 2019 12:10 #32839 by EricGoodrich
Replied by EricGoodrich on topic 2001 Oldsmobile with a gm 4.3 no spark
What I can tell you is that the ground side of the coil fluctuated from battery voltage ( cranking voltage ) to zero as the ignitor was commanding the coil. And, the coil current was as about a square wave as I've ever seen on an ignition coil current ramp.

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15 Aug 2019 12:14 #32840 by EricGoodrich
Replied by EricGoodrich on topic 2001 Oldsmobile with a gm 4.3 no spark
I also confirmed no unwanted voltage drop on any circuits for the coil or the ignitor.

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15 Aug 2019 13:42 #32841 by Chad
Replied by Chad on topic 2001 Oldsmobile with a gm 4.3 no spark
NEW means Never Ever Worked. If you have a good coil, good power supply, and a good ground, then you should see a ramp. If you have a clean turn-off, you should have spark. Voltage and current waveforms would be helpful.

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