Diagnosis using exhaust composition
REACTIONS IN THE CYLINDER
- O2 together with HC gives CO2 and H2O
- O2 with CO makes CO2
- CO is an indicator of the saturation of a mixture
- HC is an indicator of saturation (or poorness) of mixture and curve ignition
- CO2 is an indicator of the success of the combustion process and is the highest for lambda factor 1
- if the amount of CO increases O2 falls
- if the amount of O2 increases then the amount of CO decreases
Diagnosis using exhaust composition
CO | CO2 | HC | O2 | The cause of the problem |
tall | low | tall | tall | Saturated mixture with inflammation problems |
tall | low | tall | low | Defective thermostat or temperature sensor |
low | low | low | tall | Air entry into exhaust system behind the catalyst |
low | tall | low | tall | Injection error, the catalyst performs its function. |
tall | low | moderate | tall | Saturated mixture - excess fuel. |
tall | tall | tall | tall | Defective Injector, Defective Catalyst. |
low | low | tall | tall | Defective spark plug, poor mixture, defective air quantity sensor or poor sealing of suction pipes behind sensor |
low | tall moderate |
low | low | Correct operation of the engine and catalytic converter. |
Source: www.autoispuh.hr
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