How to deal with BMW's unqualified exhaust? How to deal with BMW's unqualified exhaust? Many car owners are worried about this problem in the annual inspection. Excessive emissions are caused by insufficient fuel combustion, including the following reasons:
1. Three way catalyst failure
The three-way catalytic converter is not without current. Due to the long-term failure to clean, the carbon deposit seriously increases the three-way exhaust resistance, and the exhaust gas emission deteriorates beyond the standard.
2. Spark plug failure
Serious carbon deposit in spark plug causes insufficient combustion of gasoline, which also causes excessive exhaust gas. The spark plug needs to be replaced regularly. The vehicle maintenance generally includes replacing the spark plug. Spark plug gap will cause excessive carbon monoxide, carbon deposit will cause excessive hydrocarbon value, replacement of spark plug can be solved.
In general, vehicles that burn oil will have smoke "smoke" symptoms in varying degrees, and fuel consumption will increase significantly, so they have to refuel in a short period of time. The combustion of automobile engine oil will lead to the increase of carbon accumulation in combustion chamber, the decrease of automobile economy, the decrease of power performance, and the over standard exhaust emission, which can not pass the environmental impact assessment and other adverse consequences.
4. Carbon deposit of oxygen sensor is dirty
Once the vehicle burns oil to pollute the oxygen sensor, the signal will be unstable or wrong. It is recommended to repair the oil fault as soon as possible. Otherwise, a new sensor has been broken for several days. The most serious problems are blue smoke in the exhaust pipe, unstable idle speed, etc.