Vacuum-operated EGR valves use a vacuum solenoid to vary the vacuum and direct it, opening and closing the EGR. Some systems even have sensors that feed information to the onboard computer. Digital ...

This is a system where the ECM can determine EGR flow based on a pressure drop across the opening in the EGR passage by using a transducer. Based on this input, the ECM, using an EGR vacuum regulator, ...

Though the engine has a mass air flow sensor (MAF), it also has a manifold absolute pressure sensor (MAP). Any time the EGR valve is commanded open, the PCM compares the drop in manifold pressure to ...

Halsten says to replace the EGR valve when it throws a P0401 (EGR Flow Insufficient) code, which usually doesn’t happen until after 100,000 miles.. Note: Make sure your LMM Duramax has the most ...

In this approach, the air provided to the engine intake manifold will use up to 30% recirculated exhaust gas. In the future this may be increased, exposing the TMAP sensor to not only higher air ...

Volvo developed Precision Flow exhaust-gas recirculation (EGR) to improve fuel economy by 3 percent even as they met EPA's 2007 emissions standards for on-road diesel engines. Volvo developed ...

Various parameters such as intake air mass flow rate, fuel injection quantity and (Exhaust Gas Recirculation) EGR flow rate are affecting the AFR magnitude. In this study a detailed mathematical, ...