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HYDROCARBONS (HC) unburned fuel entering atmosphere. Gasoline in its liquid form is a hydrocarbon. (raw fuel) misfire indicator (ignition system or compression problem)

220 old 30 new

OXIDES OF NITROGEN (NOx) are nitrgen mixed with oxygen at high pressure and temperature (2500 F) if fails for NOx EGR or timing problem

CARBON MONOXIDE (CO) tasteless, odorless, invisible gas. (rich indicator)Fuel system problem

1.2 for 95 or older .3 newer

OXYGEN (O2) lean indicator, vacuum leak or lack of fuel

CARBON DIOXIDE (CO2) efficiency indicator, the higher the better. More it produces better it is

this is straight out of my notes on emissions, on how to use a four gas analyzer. water may also come out, this is natural, dont worry about it.

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