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Re: GM TBI ECU #1228746 No Injector Pulse
Posted to Technical Discussion Forum on 12/30/2018

I would scope the distributor signals at the ECM.

[1995 Chevrolet C1500 Cheyenne, ECM/Inputs/Outputs Waveform]

The CH A DREF and the CH C EST are at the same ignition timing when the bypass is low.

When CH D Bypass goes high, the EST advances the ignitio... Login to read more.

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