GMPP LS2 Small Block Engine - The Perfect Project Motor?
7b. When the carburetor is throttled down to the idle position, the micro switch is triggered and sends a signal to the computer. The computer recognizes the engine is idling and then conditions the ignition timing to smooth out the engine's idle. If the engine has an aggressive camshaft that makes the idle rough, the computer will constantly adjust the timing advance to match the idle and smooth it out. If the engine rpm surges upward, the computer removes timing, and if the engine rpm slows down, the computer adds in more timing until the engine is running smoothly. It's pretty trick and makes navigating parking lots with a rumpity-rump camshaft easier.
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