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Old 10-14-2012, 07:05 AM
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EagleMark EagleMark is offline
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You can't set timing by ear.... these CCC and all GM EFI systems are usually set to 0 advance with Bypass wire disconnected, usually a tan wire with plug from the EST-ICM modle in distributor. ESC is module for knock system retard, Disconnect this wire and set timing to 0 with light. Then when plugged back in ECM will control timing and can be 10 to 20 degrees advanced. Will also set a DTC so disconnect battery to clear codes.
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