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Timing, vacuum, and carburetor jetting can affect CO levels, keep in mind that high 7% or low will cause high hc readings. set timing to factory setting and adjust carb jets for smoothest idle, probably will slow idle down quite a bit so after that adjust the idle speed screw until idle speed is at normal. you will need to reset after test is done. All settings must be at optimum for burning fuel as co is unburnt fuel, that is why vacuum leaks are not good.

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Q: What will help you pass your emission test on your car if the co level are to high?
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