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According to my repair programs at my shop there is no actual connector for the est.To set the timing you need to short'a' and 'b' of the dianostic connector.I use a paper clip bent in a 'u' shape.Tool manufacturers do make a key to plug in but it does the same thing.With the engine running you can set the timing.With the engine off and the key on this will blink the check engine light for any stored codes in you computer system. whitegorilla@Yahoo.com

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Q: Where is the EST Circuit on a 1987 2.5 Chevy S-10 located?
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