WS7 Exhaust Gas Analysis (Petrol only)

WS7 Exhaust Gas Analysis (Petrol only)

1.With the analyser probe senseng normal air, what are the four Gas 

readings? Record the amount and then what it means:

CO ..0.00% means: This means concentration of CO the air

.....................................................................................................................

HC ..- 5 ppm means:This means concentration HC in air

.....................................................................................................................

CO2 ..0.02% means: Quantity of CO2 in the

.....................................................................................................................

O2 ..0.02%  means  concentration of O2 in air

.....................................................................................................................

2. Start the engineidling cold, and record the Four Gas readings

Explain what is happening within the engine referring to the four gases:

CO 0.32% HC274ppm CO14.62% O2 0.32%

In this test CO is 0.32% it is means the engine not burn hot , HC274ppm little high , CO2 is 14.62% , O2 0.32% that means the engine is runing little reach but is Ok the engine is cold in this case good cumbustion for that cold engine.

3 When the engine has warmed up, record the four gas reading :
Explain what is happining within the engine referring to the four gases;
Co 1.83% HC 591ppm CO2 12.676% O22.79%

Co is high , HC, and O2 are also hohigh if compear with last the engine is runiong in this case rich

4 At 2500 RPM warm engine recording :

CO 2.167% HC 372 ppm CO2 13.42% O2 0.17%

In this record the level of CO high more than idle , but the HC level is low now O2 is also this ok ,because the cumustion burned air fuel mixter exhaust emission is good at this condition.

At idle creat lean condition with air leak or vacum leak recrding of the four gases is belw;

CO 3.127% HC 776ppm CO2 12.21% O2 1.2%

The HC is high the engine is runing rich we can see the level of O2 is wet up in test

8 Disconnect the one spark p;ug wire and ground it with ajumper wire , the recording four gases are below:
CO 0.50% HC 1686 ppm CO2 0.606% O2 3.61%

High HC and O2 that cause be unburn fuel in one cylender lower CO2 and CO are because catlaytic convintion of conventer.

9 Disconnected one harness of fuel injector and the record of this test is beloow ;
CO 0.114% HC 153ppm CO2 11.84% O2 4.86%

In test test we can the changing from beffore the level of HC and CO are lower but the level of O2 and CO2 higher .
Because one cylender fuel injector is disconnected not injeced the feel engine runing heat that way the level of CO2 is high also engine runing rich.

10 OPtional change the engine at idle , turn on the AC and turn the steering record of four gases:
Co 0.119 HC 22ppm CO2 14.49% O2 0.58%

With steering wheel Turning and AC on more power need to do so the compenstate this need and engine work hard need mre fuel but engine at idle not more air com entire throogh the throttle , that way HC burning properly , but CO2 is high cause high cumbustion and more CO in exhaust cause of low O2 convent into CO2 by the CAT.

10. Explain the different readings you would get from a vehicle with a catalytic converter and a vehicle without one and why?

With vehicle having catalytic converter, the CO and O2 values would be low and CO2 value would be high but the vehicle without it would have CO and O2 values high in the exhaust gas and CO2 would be low

 

 

12.  On lambda, O2 sensors why do they have 1,2,3,4 or 5 wires and what do these extra wires do?

 

The vehicle which we test the gases exhaust emmission has the O2 sensor four wires . One wire is ground , one for heater , one reffrince or volt supplay from ECU, and the forth one is signal to ECU.