What is causing my GMC to advance the timing about 25° when I plug the wire under the dash together?
I disconnected the tan/black wire before setting the timing. I set the timing to 0°. Shut it
down, connect the wire back, and when I check the timing, it advances about 20°. If I
disconnect the wire again, it goes back to 0°. Thanks for any help in advance!
when you set the timing to zero you are setting it at a starting point for the computer. Connecting the wire now allows the computer to manage the timing for optimum performance at all times
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