what is the difference between a pcv and egr valve?
310533
A PCV valve helps keep a constant pressure within the engine block by releasing oil fumes when they get to a certain pressure and sending them into the fuel system to be reburned with the gas. EGR works by recirculating a portion of an engine's exhaust gas back to the engine cylinders.
272412
Exhaust Gas Recirculation (EGR) is a system that allows the exhaust gases to be recirculated back into the intake manifold. This process leads to a significant reduction in nitrogen oxides (NOx) emissions because it reduces the two elements underlying its production: oxygen in excess and combustion temperature.
18085
Why the PCV Valve Is Important Bad PCV valves can cause engine oil contamination, sludge build-up, oil leaks, high fuel consumption, and other engine-damaging problems, depending on the type of failure. ... That's because most car owners don't include the PCV system in their maintenance routine.
1126812
The PCV (positive crankcase ventilation) valve is a one-way valve that recycles crankcase gases back into the engine to burn. A plugged PCV valve can result in a rough idle and poor mileage. ... And never replace a PCV valve simply because it 'looks dirty. ' All used PCV valves look dirty.
448259
The Differential Pressure Feedback Exhaust Sensor, or DPFE sensor, is part of the vehicle's exhaust gas recirculation (EGR) system. The sensor monitors and measures the pressure with the EGR valve. This prevents the valve from malfunctioning and allowing too much exhaust into the intake manifold at one time.
531980
The EGR valve affects the operation of the engine and the emission system directly. But in modern vehicles, driveability problems can affect transmission operation. ... So, it is possible the EGR system is affecting your transmission.
536347
It isn't uncommon to see 50 or more PCV valves on the shelf of any auto parts store. Each one has unique flow characteristics and vacuum transition points, and is designed to work with the vacuum and blowby requirements of a certain group of engines.
1464142
A relief valve or pressure relief valve (PRV) is a type of safety valve used to control or limit the pressure in a system; pressure might otherwise build up and create a process upset, instrument or equipment failure, or fire.
219846
Another symptom of a bad or failing PCV valve hose is your vehicle will misfire while it is idling. This can be from a loss of vacuum due to the hose not working properly because of a leak, the hose being pinched, or becoming clogged from buildup over time.
270562
In internal combustion engines, exhaust gas recirculation (EGR) is a nitrogen oxide (NOx) emissions reduction technique used in petrol/gasoline and diesel engines. EGR works by recirculating a portion of an engine's exhaust gas back to the engine cylinders. ... For example methanol is more tolerant to EGR than gasoline.
135113
The difference between the two valve types is the number of exhaust ports: A 5/2-way pneumatic valve has two independent exhaust ports. A 4/2-way valve has only one common exhaust port.
640227
A relief valve or pressure relief valve (PRV) is a type of safety valve used to control or limit the pressure in a system; pressure might otherwise build up and create a process upset, instrument or equipment failure, or fire. ... The blowdown can vary from roughly 2–20%, and some valves have adjustable blowdowns.
165046
Every cylinder in an internal-combustion engine contains one intake valve and one exhaust valve. ... The intake valve is the larger of the two valves. It controls the flow of fuel into the combustion chamber. The exhaust valve controls the flow of exhaust gases out of the cylinder.
1379630
It is made of an air to oil separator (an OEM catch can), a valve that closes under boost, and a hose directly to the manifold. This side of the PCV system pulls crankcase pressure out when there is vacuum in the intake manifold such as at idle and during cruising.
837920
One way to check whether a PCV valve is functioning is to remove it from the hose or tube and shake it. If you can hear a metallic rattling noise, it's likely in good working order. If you do not hear anything when you shake the valve, it is likely that it is no longer opening and closing like it should.
637676
The simple On-Off Vacuum Switching Valve (VSV) ISC system is controlled by signals from the ECU or directly by tail lamp and rear window defogger circuits. ... The VSV allows only a small amount of air to by-pass the closed throttle valve when it is open, increasing engine speed by about 100 rpm when energized.
1251225
The 4/2-way pneumatic valve has four connection ports and two states. The difference between the two valve types is the number of exhaust ports: A 5/2-way pneumatic valve has two independent exhaust ports. A 4/2-way valve has only one common exhaust port.