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Curious about B1477 DTC from BCM.

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Old Aug 22, 2025 | 11:19 PM
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Originally Posted by CathedralCub
How are you testing for spark?
Most recently at the coil to plug wires end rather than the plug to wire end so I can see but light under the hood.
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Old Aug 22, 2025 | 11:20 PM
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Originally Posted by 02 century
Most recently at the coil to plug wires end rather than the plug to wire end so I can see but light under the hood.
With a spark tester..
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Old Aug 23, 2025 | 08:36 PM
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What is the gap that you have set in the spark tester?
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Old Aug 23, 2025 | 10:56 PM
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Originally Posted by CathedralCub
What is the gap that you have set in the spark tester?
Not the gap kind the light kind.. Lisle 220v bulb
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Old Aug 24, 2025 | 10:07 AM
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Do you know that the bulb is good?
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Old Aug 24, 2025 | 10:25 AM
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Originally Posted by CathedralCub
Do you know that the bulb is good?
Yes. It works just fine.
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Old Aug 24, 2025 | 01:07 PM
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Originally Posted by 02 century
Yes. It works just fine.
How does that work on 40K out a coil?
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Old Aug 24, 2025 | 01:57 PM
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Originally Posted by carfixer007
How does that work on 40K out a coil?

Are you suggesting that there isn't spark because of the test tool?
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Old Aug 24, 2025 | 02:10 PM
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Originally Posted by 02 century
https://cimg6.ibsrv.net/gimg/www.gmforum.com-vbulletin/800x396/screenshot_20250824_105430_2_a22f637163080cfc7aaa6 b0de816881e8c4c3.png
Are you suggesting that there isn't spark because of the test tool?
It works better at 40,000 v than this measly 10,000 volts barely tickling its fancy..😉
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Old Aug 24, 2025 | 02:15 PM
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Originally Posted by 02 century
It works better at 40,000 v than this measly 10,000 volts barely tickling its fancy..😉

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