User's Manual

Gas Analysis
73
Lambda status
5 Gas - Catalytic Vehicle Typical Readings
These are typical limit values of the 5 gasses for fuel injected vehicles and are not
specific to any vehicle:
• CO < 0.3%
CO
2
> 14%
HC < 200 ppm
O
2
<1%
NOx < 100 ppm
Condition Result
Too lean Poor engine power
Misfiring at cruise speed
Burnt valves
Burnt pistons
Scored cylinders
Spark knock
Slightly lean High gas mileage
Low exhaust emissions
Reduced engine power
Slight tendency to knock
Stoichiometric Best all round performance
Slightly rich
Maximum engine power
Higher emissions
Higher fuel consumption
Lower tendency to knock
Too rich Poor gas mileage
Misfiring
Increased air pollution
Oil contamination
Black exhaust