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Distributor Advance is the wrong term; the Distributor Advance system implies actually moving the timing components of the distributor to control timing of spark in the engine (A Vacuum Advance, is an example of this).

Modern controls use computer spark mapping, through learned routines or factory set timing models to control the spark based on these tables, through the computer. In all essence it is the computer that controls all spark functions.

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Q: What controls distributor advance on a 1987 Chevy 305 TBI engine?
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