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Old 03-31-2007, 11:55 AM   #4
vzfox
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Re: 1989 GMC Sierra....Electronic Spark Control

I found the problem. The knock sensor mounted next to the starter was disconnected. The wire to the knock sensor had gotten severed.

FYI......The knock sensor wire is DK BLUE and connects to the ESC module mounted next to the TBI.

Not sure about the shifting problem I am having at lower speeds, but I am sure this will help somewhat.
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