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Originally Posted by Movieguymookum
Ok, I have read that thread and many more on this forum and still cannot verify if the 1997 vortec 5.7L has an EST wire, i.e. the brown wire w/black trace that the computer uses to advance the timing by whatever means.
That is my question and it is not answered in that thread, although that is where I gathered the 1200 rpm accuracy note I mentioned.
When I put the scantool on the truck and turn the dist. cap, the timing stays about the same, somewhere between 22-25 degrees no matter what direction or how much i turn it because the computer is compenstating. Though, at the extremes, the truck stumbles and dies.
I also understand that when you mention timing you are really referring to the cam/crank correlation and not actual timing.
I want to set the base with no computer interference or advancement. How is that accomplished?????
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95 is the last year with the EST wire; therefore, your 97 does not have it (unless someone installed a TBI engine in place of the Vortec).
Timing is completely controlled by the PCM. All you can do is set the cam retard which is what you need to do in order for your timing to be correct.
//2000CAYukon