Re: Base timing shifting when hot

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Posted to Technical Discussion Forum on 4/15/2017 10 Replies

I am just showing this as a known good reference on start up

[1991 GMC C1500 Sierra, ECM/Inputs/Outputs Waveform]

91 GMC 1500 5.0

CH A EST white wire

CH B DREF ppl/wht

CH C Bypass tan/blk

CH D lo ref blk/red

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