traktrbeam
Well-Known Member
During cold start, the PCM logic pushes the throttle blade open which requires the timing to be retarded far into the negatives to heat up the exhaust and light off the cats. In order to reduce the noise, we used to reduce the amount it was allowed to retard timing because that's all we had access to do. However, with PCMTec you have access to auF24202, which is the threshold of cat temp to exit CSER set at 650 deg F stock, and auF24298, which is the threshold of cat temp for high idle set at 900 deg F stock.
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