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EGR, which stands for Exhaust Gas Recirculation, comes equipped on most new vehicles, as well as some older models. The EGR valve recirculates burned exhaust emissions back into the intake system so the emissions can be re-burned, or recycled, out the exhaust.
1. Open one of your vent covers and look inside. See if it contains any dirt, debris, or matted dust. 2. Examine the return air registers for dust buildup, particularly if there are thick, fuzzy coatings of dust. 3. Pull out the air filter. If the air filter is clogged with dust, then air flow is being choked off. This lets more dust settle and build up in the return ductwork. 4. Open the furnace compartment. Examine the blower fan and motor for signs of dust as well as the furnace controls.