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Originally Posted by chevyboy05
I'm not sure that it's the knock sensor. It will idle fine with the timing at 0 degrees. When I hit the gas, the timing jumps to like 20 degrees AFTER TDC. It almost seems like the ECM isn't advancing the timing at all.
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When the knock sensor goes bad, it picks up "false" knock and the ECM will retard the timing. Disconnecting the sensor and testing will verify it this is happening.
//2000CAYukon