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What would cause my 1997 Buick to fail the emission test with very high co and no readings

I have replaced converter timing chain and gears and crank position sensor and temp sensor

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Some of the things that could cause your 1997 Buick to fail the emission test include; bad oxygen sensors, old gas cap and a badly misfiring engine. You should also ensure the lights and signals are working well and all parts required by law are in place.

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The mechanic that threw all those parts at it should explain that.
Now, it's time for a good smart $85/hr technician to trouble-shoot the problem.

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