Your truck’s emissions system is designed to reduce the harmful pollutants released into the atmosphere by gasoline and diesel engines. The repair and maintenance of these systems are crucial for both environmental and performance reasons.

Emissions System Repair At Ledom’s

At Ledom’s we’ve got the experience and the specialized electronic equipment for emissions system diagnosis and repair for both diesel and gasoline engines.

If you get the dreaded “check engine” light on your dashboard, give us a call. We can figure out what’s going on, get it fixed and get you back on the road and back to work in no time at all!

1. Gasoline Vehicle Emissions System:

Gasoline engines primarily produce three types of pollutants: nitrogen oxides (NOx), hydrocarbons (HC), and carbon monoxide (CO). To control these pollutants, gasoline vehicles are equipped with various emissions systems.

• Exhaust Gas Recirculation (EGR) System: This system recirculates a portion of exhaust gases back into the combustion chamber to reduce NOx emissions. Over time, the EGR valve or passages may become clogged with carbon deposits, which may require cleaning or replacement.
• Positive Crankcase Ventilation (PCV) System: The PCV system helps control HC emissions by venting blow-by gases from the crankcase and reintroducing them into the intake manifold. A malfunctioning PCV valve or system can cause oil leaks or increased oil consumption.
• Catalytic Converter: The catalytic converter transforms harmful pollutants into less harmful substances through chemical reactions. It can degrade over time or become clogged, necessitating replacement. Using leaded gasoline or certain fuel additives can also damage the catalytic converter.
• Evaporative Emission Control (EVAP) System: This system captures and stores fuel vapors from the fuel tank and sends them to the combustion chamber to be burned. Common issues with the EVAP system include faulty purge or vent valves, and leaks in hoses or the fuel tank.
• Oxygen Sensors: These sensors monitor the amount of oxygen in the exhaust gases and adjust the fuel-air mixture for optimal combustion. A failing oxygen sensor can reduce fuel efficiency and increase emissions.

2. Diesel Vehicle Emissions System:

Diesel engines produce different pollutants compared to gasoline engines. The primary concern with diesel engines is particulate matter (PM) and NOx emissions.

• Diesel Particulate Filter (DPF): The DPF captures and stores soot particles from the exhaust gases. Over time, the DPF gets filled with soot and requires a regeneration process to burn off the accumulated particles. A malfunctioning DPF can cause performance issues and increased emissions. It may need periodic cleaning or replacement.
• Exhaust Gas Recirculation (EGR) System: Similar to gasoline engines, the EGR system in diesel engines reduces NOx emissions by recirculating a portion of exhaust gases into the combustion chamber. The system components can become clogged or fail over time.
• Selective Catalytic Reduction (SCR): The SCR system uses a urea solution (often referred to as Diesel Exhaust Fluid or DEF) to break down NOx emissions into nitrogen and water. Issues can arise from a malfunctioning DEF dosing system, catalyst problems, or using low-quality DEF.
• Crankcase Ventilation System: Diesel engines also have a system to vent the blow-by gases from the crankcase, similar to the PCV system in gasoline engines.

3. Repair and Maintenance:

Regular vehicle maintenance can prevent many emissions system issues. This includes:

• Regular oil changes.
• Using the correct grade of fuel.
• Replacing air filters periodically.
• Checking and replacing faulty components like oxygen sensors, EGR valves, and PCV valves.

Diagnostic tools, like OBD-II scanners, can help identify issues with emissions systems, making repairs more straightforward.

Emissions systems in both gasoline and diesel vehicles play a crucial role in reducing the environmental impact of automotive transportation. Since both types of systems are heavily controlled by computers and sensitive sensors, problems can be hard to detect and repair.

But no worries at all – Ledom’s has got you covered for emissions repair.