What should EGR be at idle?
The EGR valve has two primary settings: open and closed, although the position can vary anywhere in between. During idle and at low speeds, only a small amount of power is required, and therefore only a small amount of oxygen, so the valve gradually opens – it can be up to 90% open at idle.
What happens if EGR sticks open?
Open Position: Rough idling and problems with acceleration are the two most common indicators that the EGR valve is stuck open. The truck might also stall excessively. When the EGR valve is stuck open, all of the exhaust gas cycle back into the chamber, meaning there’s not enough oxygen for a combustion to take place.
Should EGR be open at idle?
The EGR valve is closed when the engine is starting up. During idle and at low speeds, only a small amount of power is required, and therefore only a small amount of oxygen, so the valve gradually opens – it can be up to 90% open at idle.
What happens if the EGR valve is open all the time?
If the EGR valve stays open at all times and the exhaust fumes are being fed to the engine constantly, the engine gets deprived of oxygen. With too much fuel burning and less oxygen, a black smoke gets produced and escapes from the exhaust pipe especially when the car is idle.
What does EGR stand for in exhaust valve?
EGR Valve stands for exhaust gas recirculation valve, which breaks down exactly what it does. Recirculating the exhaust does a few things for overall performance. First, it optimizes the fuel to air ratio without pulling in extra air from the intake.
What are the disadvantages of a low pressure EGR system?
The main disadvantage of the low pressure EGR system is the higher inertia of the exhaust gases. All the ducts and components are relatively far from the engine and can not respond quickly in a change of the EGR rate.
What are the benefits of an EGR system?
Water vapor expands at approximately 12X per BTU input over nitrogen, and carbon dioxide has an even greater expansion ratio. One of the benefits of EGR (when properly done) is more bang for the BTU. Remember, oxidizing fuel only generates HEAT. This heat must act upon the gasses in the cylinder by expanding them generating PRESSURE.