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Re: No start, no spark, help me remember how to test this
Posted to Technical Discussion Forum on 3/29/2023

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[91 GM truck 5.7]

91 GM truck 5.7 and the capture is during the engine cranking to start.

The blue channel is the EST wire or the Electronic Spark Timing, from the ECM to the ICM. When the engine ... Login to read more.

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