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Every two years, Connecticut mandates a vehicle emissions test for all drivers. While it might come as a shock if your vehicle's system doesn't pass, there are often signs that could hint at potential issues with the emission system.
How Does the Emissions System Function?
Emissions systems are designed to minimize toxic substances being released into the environment. Additionally, their operation contributes to fuel efficiency and ensures optimal engine performance.
The emissions system comprises components such as the fuel tank, carburetor, exhaust, and crankcase. Many modern vehicles also feature an evaporative emission control (EVAP) system, which helps trap and burn harmful gases before they enter the atmosphere. The EVAP system typically includes:
- A vapor recirculation tube
- A vapor control valve
- An evaporative emission canister
- A pressure sensor for the fuel tank
- A canister vent valve
- A purge valve for the evaporative canister
- A two-way evaporative valve
Addressing emissions isn’t just beneficial for the environment; it also enhances public health. Neglecting harmful gases emitted by cars can lead to higher rates of asthma and carbon monoxide poisoning within communities.
Signs of an Emissions Issue
Your car may be dealing with an emissions problem if you notice any of these indicators.
Check Engine Light
Though not the most specific indicator, the check engine light turning on can suggest an emissions-related issue. It could point to anything from a faulty sensor to a leak somewhere in the system, causing the release of harmful gases.
Decreased Performance
Reflecting on your vehicle's performance prior to the test, you might have observed a decline. Since the emissions system interacts with the fuel and exhaust systems, as well as the engine, you might have noticed reduced fuel efficiency or the engine losing power easily.
Declining Fuel Economy
The emissions system stops your car from continuously releasing gas vapors. A drop in miles per gallon or faster gas consumption can signal a leak somewhere along the system—such as the carburetor, muffler, exhaust manifold, or fuel tank.
Strange Smells
Generally, your car might be experiencing an emissions issue if you detect a strong odor emanating from the exhaust. Another sign of a fuel leak, this scent might linger even when the car isn’t running.
Leaking Fuel Tank
The EVAP control canister can collapse if it has a solid cap, especially if it becomes clogged or damaged. This situation can cause the system to leak and affect your system’s performance.
If your car recently failed an emissions test and you're experiencing any of the above signs, it’s wise to schedule an inspection with DaSilva’s Auto Body to have the emissions system checked and repaired. To book an appointment, reach out to our Naugatuck shop today.
Emissions problems can lead to more than just failed tests—they can impact your wallet and safety. Addressing these issues promptly ensures both your vehicle and the environment stay healthy.
June 07, 2025