What's wrong with the smell of exhaust
Recently, the issue of vehicle exhaust odor has become a hot topic of discussion. Especially in the context of increased environmental awareness, many car owners and netizens have shown great concern about the causes, hazards and solutions of exhaust odor. The following is a compilation of relevant content hotly discussed across the Internet in the past 10 days, presented with structured data.
1. Analysis of common causes of exhaust gas odor
| Cause Type | Specific performance | Percentage (discussed on the entire network) |
|---|---|---|
| Inadequate fuel combustion | Black smoke, pungent and sour smell | 35% |
| Three-way catalyst failure | Rotten egg smell | 28% |
| Oil leakage combustion | Blue smoke, burnt smell | 20% |
| EGR valve failure | Diesel smell is aggravated | 12% |
| Other reasons | If the sensor is damaged | 5% |
2. The focus of hot discussion among netizens
1.Relevance of environmental policies: After many places implemented the National VI emission standards, the exhaust problems of some old models were prominent, and the number of related complaints increased by 22% year-on-year.
2.Comparison of new energy vehicles: Electric car owners generally report that "the smell of fuel exhaust gas is obvious", and the topic reads over 5 million in a single day on social platforms.
3.Share self-test method: Douyin's "Three-step Self-examination of Exhaust Odor" video received 1.2 million likes:
- Observe the smoke exhaust color during cold start
- Smelling odor changes while driving
- Regularly check the oxygen sensor
3. Professional organization testing data
| Testing items | Normal value range | Typical values of odor vehicles |
|---|---|---|
| HC (hydrocarbon) | 0-50 ppm | 300-800 ppm |
| CO (carbon monoxide) | 0-0.5% | 2.5-6% |
| NOx (Nitrogen oxide) | 0-100 ppm | 500-1200 ppm |
4. Ranking of hottest solutions discussions
| Solution | Discussion Hot Index | Validity score (10-point scale) |
|---|---|---|
| Replace the three-way catalyst | 95 | 8.7 |
| Clean oil circuit system | 88 | 7.2 |
| Use fuel additives | 76 | 6.5 |
| Oxygen sensor repair | 65 | 8.1 |
5. Expert advice
1.Regular maintenance: The exhaust system should be checked every 20,000 kilometers, and replacing the air filter can reduce the probability of odor by 30%.
2.Oil selection: Sinopec experimental data shows that using 95# gasoline can reduce the emission of odor substances by 42% compared with 92# gasoline.
3.Fault warning: When the exhaust gas is illuminated and tears or there is a significant sulfur smell, it needs to be repaired immediately, and the catalyst may have failed.
6. Real user cases
Case 1: BYD owner reported that "the cold start exhaust gas has a plastic smell". After investigation, it was found that the turbocharger tube was poorly sealed, and the odor disappeared after repair.
Case 2: Volkswagen EA888 engine owners collectively complained about "engine oil-flavored exhaust gas", and the 4S store finally resolved by replacing the PCV valve.
Recent data shows that among the complaints about exhaust odor, German cars account for 38%, American cars 27%, Japanese cars 19%, and domestic brands 16%.
In summary, the exhaust odor problem needs to be comprehensively investigated from multiple aspects such as fuel, exhaust system, sensor, etc. It is recommended that car owners detect abnormalities in a timely manner, so as to protect their car and contribute to environmental protection.
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