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What exactly is car exhaust testing?
2024-10-12
Automobile exhaust detectionMainly testing.Whether the emission of HC (hydrocarbon), CO (carbon monoxide) and NO (nitric oxide) compounds meets the standard. Four-wheel drive vehicles and dual-idle vehicles also need to detect the lambda value, the excess air coefficient.
If the tail gas is still unqualified, the following tail gas treatment schemes for common ground gas are for your reference only:
One,CO (Carbon Monoxide Exceeded)
It may be because the engine mixture is too rich, the combustion is not complete, the intake system is not smooth, and the fuel injector is worn. It is recommended to check the air filter, spark plug, ignition timing, replace the fuel injector, replace the piston ring, and clean the intake and exhaust valves. Carbon and glue, clean three-way catalysis;
Two,HC (hydrocarbon exceedance)
It may be due to insufficient oxygen supply in the intake system, carbon deposits in the cylinder, poor atomization of the fuel injector, large spark plug gap, and incomplete combustion. It is recommended to check the air filter, clean the temperature sensor, clean the fuel injector, and the intake and exhaust valves of the combustion chamber. And the carbon deposits and gums in the seat, clean the three-way catalytic converter
three, NO (Nitric Oxide Exceeded)
It may be due to the lean gasoline mixing ratio in the intake system, a large amount of carbon deposits in the combustion chamber of the engine, the formation of an excessive open flame in the cylinder, and the failure of the three-way catalyst and oxygen sensor. It is recommended to check the air filter, spark plug, throttle, oxygen sensor and three-way catalytic converter, clean the fuel injector, combustion chamber, intake and exhaust valves, and the carbon deposits and gums in the seat, and clean the three-way catalytic converter;
Four, CO, HC, NO are slightly exceeded
It may be that the spark plug gap is too large; the fuel injector detects poor atomization, and there is a lot of carbon deposits and glue oil in the cylinder wear, Three-way catalytic converter and oxygen sensor failure, etc. Check the air filter, spark plug, intake air temperature sensor, intake pipe pressure sensor, add dual-core antifriction repair agent and high-efficiency cleaning agent, if it is invalid, use three-way catalytic converter cleaning agent to clean the three-way catalytic converter;
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