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What Are the Symptoms of a Bad EGR Valve? Exhaust gas recirculation systems aren't exactly the most glamorous systems in the average car, but they do perform several very important jobs. An EGR might not help you get where you're going any faster or looking any better, but a working one will get you there a good deal cleaner and cheaper. Symptoms An EGR valve works by recirculating used exhaust gases into your engine. These gases contain unburned fuel but very little oxygen, and they're very hot. A hot intake charge carries less oxygen, so a working EGR system effectively makes your engine act smaller than it really is. In terms of driving, an EGR valve that's stuck open will cause a noticeable drop in horsepower at the very least. Along with that may come detonation -- "knock" or "ping" -- under hard acceleration, and the attendant cylinder misfires. The engine will also see an open EGR valve as a massive vacuum leak, so expect hard starting...

How to Check an EGR EGR valves in a car regulate combustion temperatures within the engine of a car. The valve recycles exhaust back into your car, which makes the car more energy efficient and reduces the amount it pollutes. A faulty EGR valve will result in either a clicking sound in the engine or an engine stall while it is idling. Luckily for car owners, the EGR valve is very easy to check, and you do not need extensive auto-mechanic knowledge in order to perform a thorough inspection of your EGR valve. Things You'll Need Owner's manual Instructions Turn the ignition on in your car, and leave the car in park. The engine should be allowed to warm up for several minutes before you inspect the EGR valve. Pop open the front hood of the car. Locate the EGR valve by consulting your car's owner's manual. The location of the valve will differ according to vehicle make and model. Observe the EGR valve while someone revs the engine. If th...

What Are the Symptoms of a Bad EGR Valve? Exhaust gas recirculation systems aren't exactly the most glamorous systems in the average car, but they do perform several very important jobs. An EGR might not help you get where you're going any faster or looking any better, but a working one will get you there a good deal cleaner and cheaper. Symptoms An EGR valve works by recirculating used exhaust gases into your engine. These gases contain unburned fuel but very little oxygen, and they're very hot. A hot intake charge carries less oxygen, so a working EGR system effectively makes your engine act smaller than it really is. In terms of driving, an EGR valve that's stuck open will cause a noticeable drop in horsepower at the very least. Along with that may come detonation -- "knock" or "ping" -- under hard acceleration, and the attendant cylinder misfires. The engine will also see an open EGR valve as a massive vacuum leak, so expect hard start...