1994 yukon engine pinging knock detect sensor help?

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bigriver

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Timing was set to 0 degrees TDC a few months ago after replacing intake manifold gaskets and the Yukon ran fine. It has started pinging recently on moderate to hard acceleration. I decided to check the timing again to make sure it was still set. After unplugging the tan/black wire I checked the timing and it was set way after TDC although it idles fine. So I tried to adjust it back to 0 degrees TDC and it will barely run.

"Question being if the knock detect sensor goes out will this inable the timing to be properly set?" Is there a way to check the knock detect sensor with a volt/ohm meter?
 
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