WS7

CO:

Carbon monoxide is a indicator of rich air/fuel mixture and shows there is not enough oxygen in the combustion chamber. The lower the better because it is a very dangrous gas and lethal for humans because of it properties and also indicating not a efficent combustion due to too much fuel and not enough oxygen.

HC:

Hydro carbon levels show the amount of unburnt or partly burnt particals in the exhaust. misfire due excessive lean and also rich air/fuel ratio ,misfire can also be due to ignition problems.The lower the levels of HC the more efficent the fuel is being burnt in the combustion chamber . It is also a green house gas and related to global warming.

CO2:

Carbon dioxide is a good by product and indicates good combustion inside the engine and is produced when the fuel is oxidised , a good rule is the higher the CO2 level the more efficient the engine works .Even tho this is a a good gas for an engine it is also concidered a green house gas and related to so called ''Global warming''. Air/ fuel imbalances , misfires and mechanical problems in the engine will decrease the amount of CO2 produced because ideal combustion will produce high levels of CO2 and water vapor. A good way to measure combustion effiecency.

O2:

high levels of oxygen is a good indication of lean air/fuel mixture because O2 increases as the air/fuel mixture gets leaner , it also can indicate misfire but we have to look at HC to come up with this conclusion .

CO: 5.8 HC: 521 CO2: 11.53 O2: 0.28 Cold engine idling

CO is high which shows rich air/fuel mixture because the engine is cold , High HC again indicates not an efficient combustion and high levels of fuel not getting burnt completely. in comparison with the level of CO2 when the engine is warmed up this indicated not a very efficient combustion . O2 levels are low as the air/fuel mixture is rich .

CO: 7.1 HC: 506 CO2: 10.6 O2: 0.20 Warm engine idling

CO level still high wich indicates rich air/fuel mixture, HC is also high which tells us there is high number of fuel particals not being burnt due to rich air/fuel mixture and not enough oxygen being present to help burn all the fuel off. CO2 is also low which cofirms rich mixture and finally low O2 which can also tell us rich air/fuel ratio.

CO: 0.4 HC: 123 CO2: 14.6 O2: 0.47 Warm engine 2500 RPM

Low CO shows a good air/fuel ratio , low HC which indicates more efficiency , High CO2 tells us a good and efficient combustion and a little higher O2 readings which tells us the air/fuel mixture is not as rich as the 2 readings before .

CO: 1.6 HC: 250 CO2: 13.21 O2: 2.38 Idle, Rich mixture

High CO levels and high HC reflect on the rich mixture , CO2 levels a little less than the above reading which shows not as much efficiency in the combustion and high O2 shows not all the Oxygen is getting burnt .

CO: 0.07 HC: 230 CO2: 11.88 O2: 4.9 Idle, Lean mixture

Low HC and high O2 levels indicates Lean air/fuel mixture , even lower CO2 levels shows us the effiency is decreasing .Low and good CO readings.

CO: 3.349 HC: 1188 CO2: 9.09 O2: 9.34 Blipping throttle

High CO due to very rich air/fuel mixture , High HC shows us not all the fuel is being properly burnt , low Co2 which shows the effiency of the engine is deceasing and high O2 shows us a very very rich mixture and probably the most inefficient part of a normal operation .

CO: 0.157 HC: 2672 CO2: 7.28 O2: 11.03 Disconnect one spark plug

High HC , O2 shows us the fuel and air not being burnt in one cylinder , CO2 decrease shows the combustion effiency is falling ,CO levels are a little bit high but thats because a cylinder with no spark doesnt effect the CO levels.

CO: 0.068 HC: 188 CO2: 6.94 O2: 11.72 Disconnect one Injector harness

Good and low CO reading , low HC and high O2 shows us there is too much oxygen not being burnt and even lower CO2 levels indicates a very poor combustion .

CO: 0.550 HC: 195 CO2: 14.02 O2: 1.58 under load

A little bit high CO levels due to the rich air/fuel mixture , a bit higher than average HC which is because of the rich mixture , highest CO2 level which indicates the most efficient combustion period for this engine , higher than normal O2 reading can indicate that this not too much of rich mixture and still has enough Oxygen to burn all the fuel properly.