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I am connecting to a General Motors OBD II vehicle and the Cylinder #1 Timing is showing advanced when it should be retard. What is wrong?

April 26, 2017cylinder ii motors OBD timing vehicle

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I am connecting to a General Motors OBD II vehicle and the Cylinder #1 Timing is showing advanced when it should be retard. What is wrong?

1 Answer

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On some of the older model General Motors OBD II vehicles, General Motors did not properly scale the Spark Advance Timing, so it is possible the sign of the advance displays incorrectly.