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DOES ANYONE KNOW ABOUT THE SPARK CONTROL MODULE ON A 84 WHAT DOES IT DO. ON A 85 AND UP THE SAME MODULE IN THE GM PART BOOK SAID ITS A SPARK KNOCK MODULE. 
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Depending on the year, and engine, it normally would control the advance/retard of the ignition. If the ECM detects "knock", or "pinging", it will retard the timing until it no longer registers the spark knock/ping. Not sure how the system is set up on the Crossfires, off hand, but this is basically what it does.
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i looked in my manual it does the same. thing. i didn't understand at first what it was. thanks
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in Forum: C4 Engines, Driveline and Handling
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