Dan Ferrell writes about do-it-yourself car maintenance and repair. He has certifications in automation and control technology. I'll tell you the symptoms below.
But before you start replacing parts, keep in mind that the same engine performance problems that indicate a bad EGR valve can also indicate problems in other parts of the system. Actually there are two kinds of bad EGR valves, with different symptoms. An EGR valve can fail in two ways: It can be open all the time, or it can be closed all the time. This will cause a continuous flow of exhaust gases into the intake manifold.
You'll notice one or more of the following symptoms:. This will permanently block the flow of exhaust gases into the intake manifold. To make things even more complicated, the same engine performance problems that indicate a bad EGR valve can also indicate problems in other parts of the system:.
Problems in other systems may cause this same symptom as well: a leaking fuel injector, bad ignition timing, bad cylinder compression, bad oxygen sensor, or other problems.
Similarly, an increase in NOx may be caused by a vacuum leak, a clogged fuel injector, low fuel pressure, a leaking head gasket, or other problems. A rough idle may be caused by a faulty ignition coil, a vacuum leak, or an ignition system problem. So before spending money and replacing parts, troubleshoot the EGR valve and other system components to try to narrow down the problem.
If your car has an electronic EGR valve, troubleshooting will be easier, because it will have a Check Engine or MIL light on the dashboard, and you will be able to find out what engine system malfunction triggered the light.
With an aftermarket scan tool, you can pull the trouble codes from the computer's memory and see what system or components are causing the problem. Then, you can try to find the fault with the help of the vehicle repair manual for your particular car make and model. Haynes makes good inexpensive aftermarket manuals. The outside air picked up through the engine's intake manifold contains close to 80 percent nitrogen and 20 percent oxygen, along with small amounts of other elements.55 12 m/j 2013 (101888 mdmdeì pìemonte
When outside air combines with the fuel and ignites in the combustion chamber, temperatures can reach above o F or o C. Combustion at these temperatures burns the usually inert gas nitrogen, creating oxides of nitrogen NOx gases, which cause air pollution and human health problems. However, when the burned exhaust gases are introduced back into the combustion chamber through the EGR valve, temperatures decrease, inhibiting the formation of NOx gases.
The EGR valve is a small component designed to allow the flow of exhaust gases into the intake manifold in controlled amounts. As such, it's a simple valve that closes and opens as needed. The EGR valve has one single job to do, regardless of the system configuration, type of control and number of sensors: that is, to either open and direct exhaust gases into the combustion chamber, or to close and keep them from entering.
Whenever you start the engine, the valve comes alive and waits in a closed position, blocking the flow of exhaust gases.The exhaust gas recirculation valve is a component commonly found on many road-going vehicles. The EGR valve is one of the main components controlling the flow and recirculation of these exhaust gases. When the EGR valve has an issue, it can cause problems with the flow and operation of the EGR system, which can lead to increased emissions and performance issues.
Usually, a bad or failing EGR valve will produce any these 4 symptoms that can alert the driver of a potential issue. Another common sign of a bad EGR valve is engine performance issues. The vehicle may also stall or hesitate while accelerating. It is not uncommon for EGR valves to malfunction and become stuck in the open position. This can lead to exhaust gas recirculation, which causes rough idling even when the conditions are not desirable.
It may also contribute to a smell of fuel as well. Commonly known as a spark knock, a pinging or knocking sound may occur when the car is accelerating. This means the fuel is detonating within the engine instead of burning steadily. If this continues to happen, it can lead to other engine component failures. The EGR valve will need to be replaced or cleaned of built-up carbon deposits.
How can I Tell if my EGR Valve Needs to be Cleaned or Replaced?
The Check Engine Light can be activated by a wide variety of other issues, so having the computer scanned for trouble codes is highly recommended.
The EGR valve is an important emissions component, especially for vehicles in states with strict emissions regulations. The most popular service booked by readers of this article is Exhaust and Emission System Inspection.
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Symptoms of a Bad EGR Valve
Fast, free online quotes for your car repair. Schedule Exhaust and Emission System Inspection. Service Area. Average rating fromcustomers who received a Exhaust and Emission System Inspection. It may also contribute to a smell of fuel as well 3.
Pinging or Knocking Soud During Acceleration Commonly known as a spark knock, a pinging or knocking sound may occur when the car is accelerating. Check Engine Light.This type of EGR valve has made the auto repair industry and GM a ton of money over the years, since it's prone to carbon blockage.
General Motors has used different types of electronic EGR valves and this article focuses on the Linear EGR valve from the mid 90's to the early 's. How can you tell them apart? By looking at the base of the EGR valve.
To illustrate this, look at photo 3 of 4 and photo 4 of 4 in the image viewer above. The EGR valve in photo 3 of 4 with the red X is not covered by this article and is tested differently. This is not the most definitive list on the subject, but does cover the majority of symptoms I've seen on this type of EGR valve setup:.
I'll show you how to test it without expensive tools. Here's what you'll need:. I'll be using these same letters in all of the photos in the image viewer so that you'll know what wire to test. Below are the circuit descriptions:. The color of the wires is not important as long as you identify the wire circuit by its letter designation.
Also, the EGR valve on your vehicle might have its connector connecting to it at a 90 degree angle or connecting straight down onto the EGR valve. This is also no cause for concern since they are one and the same when it comes to using this info to test them. To test these circuits, it's not necessary to unplug the EGR valve's connector. What I recommend you do is to test for each signal with the connector connected using a wire-piercing probe. This is the easiest and the most effective way of getting at the signals.
If you need to see what this tool looks like, click here: Wire-Piercing Probe. All Tutorials: 4. This material may not be reproduced without the author's consent. Do NOT follow this link or you will be banned from the site! Hate Spam.The Powerstroke diesel engine is installed in Ford's heavy-duty lineup of trucks. The Powerstroke's exhaust gas recirculation EGR system does have issues reported by many owners.
The EGR system recirculates the truck's exhaust back into the engine cylinders, reducing vehicle emissions. The EGR on the Ford Powerstroke is prone to clogging because of debris buildup that can cause the engine's temperature to rise as well as loss of coolant. Once the EGR cooler fails, the engine will overheat, creating multiple problems including increased emissions and decreased fuel economy. The EGR cooler needs to be cleaned or replaced on a regular basis as part of the Powerstroke's maintenance schedule.
The EGR coolers installed on models fail at a higher rate because of a design flaw. EGRs installed after are longer and square, which creates a bigger surface for debris to build up, whereas the EGR coolers installed in models made before are round. The Ford Powerstroke EGR valve can clog up due to the quality of fuel used in the vehicle and excessive idling.
Debris builds up in the EGR valve because diesel fuel burns at a lower temperature, creating more debris than with gasoline. The soot produced from diesel fuel can clog up the EGR valve quickly. This EGR problem in the Ford Powerstroke, in turn, causes problems with the turbocharger, such as stalling or misfires.
A higher quality diesel fuel, such as a cetane level of 45 or better, needs to be used in the Powerstroke, and the EGR valve needs to be cleaned regularly. The EGR takes the exhaust fumes and sends them back into the engine, which decreases the chemicals released through the exhaust system.
A vacuum leak will cause the EGR to work harder, overheating the device. Once the EGR is working above normal engine temperature, it will fail. The EGR will need to be replaced, but this does not fix the problem until the vacuum leak is found and repaired.
This article was written by the It Still Runs team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information.
To submit your questions or ideas, or to simply learn more about It Still Runs, contact us. References International Powerstroke: 6. About the Author This article was written by the It Still Runs team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information. Photo Credits red truck front view on metal background image by patrimonio designs from Fotolia.It helps those gases to return to the combustion chamber instead of directing them to the exhaust emission system.
The EGR system is crucial for reducing carbon emissions. The EGR system reduces the combustion temperatures in the cylinder, which results in lower emissions and discharging fewer oxides of nitrogen a pollutant. The working mechanism involves creating a diluted air-fuel mixture by allowing a metered amount of exhaust gas into the engine. It regulates the amount of exhaust gas passing into the engine intake manifold. What problems does a bad EGR valve cause?Pawn dewalt drill
The recirculation is designed to take place when the engine is at the optimum temperature to work properly. The engine underperforms or shows problems when the EGR occurs at the wrong time or does not happen at all.
What are the symptoms of a faulty EGR valve? Well, EGR problems depend on whether the valve is stuck closed or stuck open. As the EGR valve monitors the volume of exhaust gases entering the engine, it is obvious that any issue with it will affect the engine performance.
You may feel reduced engine power when pressing down the gas pedal or experience acceleration difficulties. The long-term effects of these issues are bad fuel economy and the vehicle guzzling more fuel than necessary. It happens due to the incorrect air to fuel ratio. As a result, the engine requires more fuel to yield any power.
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The light flashes if there is a problem with the engine so it will come on when the EGR valve fails. The engine control unit ECU monitors the activities of all engine components. It activates the light upon sensing that the valve fails to do its normal function. A malfunctioning EGR valve fails to control the volume of exhaust gases entering the chamber. As it remains in a closed or open position, the exhaust gas in the chamber is either too less or too much — leading to the idling of the engine.
The smell is so strong that can be harmful to your health. The gasoline stink is the result of engine gobbling up more oil than necessary causing the tailpipe to discharge more hydrocarbons. A functioning EGR valve reduces the emission of a vehicle.
Check the EGR system if your car fails the test. You already know that all problems occur due to two reasons — the EGR valve stuck open or it stuck closed. An open EGR valve allows exhaust gases getting into the engine but at the wrong time.
Common warning signs to look for are:. A closed valve does not let exhaust gases entering the engine at all. As a result, the temperature in the combustion chamber goes up and creates various problems. Common symptoms are:. Even if your car showing symptoms of a bad EGR valveit does not mean that you have to replace it. You should test it before throwing into the junkyard.EGR solenoids are used to switch engine vacuum on and off at the right time.
The time is based strictly on engine load and temperature. If the EGR circuit activates too soon, the engine will miss and run badly, or not at all.
If it is defective and does not switch on at all, the engine will ping and rattle under a load or going uphill. It's important that the EGR solenoid be in proper working order. Remove the EGR solenoid from the vehicle. This is usually done by removing one attachment nut. Unplug the connector. Make a jumper wire with an in-line fuse holder and install a amp fuse. Crimp each end of the fuse holder to a section of wire using crimp connectors.
Make another jumper wire and attach both wires to the connectors on the solenoid. Be careful not to let the wires touch or the fuse will blow when the other ends of the wire are attached to the positive and negative battery post. The solenoid should click as it is powered by the battery.2011 subaru outback puddle light fuse full version
Remove one of the jumper wires from the battery and install vacuum hoses on the two vacuum ports located on the EGR solenoid. The solenoid controls a rapid-deployment valve to regulate the flow of vacuum, through the ports, to the EGR valve.
Blow forcefully through one of the hoses. Air should not pass through. If air cannot pass through, neither can vacuum and the valve is closing properly. Attach the loose jumper wire back on the battery.2 step directions for preschoolers
The solenoid should click again. Blow through the vacuum hose. Air should pass through when it is energized.Dan Ferrell writes about do-it-yourself car maintenance and repair. He has certifications in automation and control technology. Learning how to test an EGR valve will save you time, money and some headaches. After miles of service, the exhaust gas recirculation EGR system—especially the EGR valve—will lead to engine performance problems due to carbon buildup, components mechanical problems, or vacuum hose leaks.
Depending on the particular problem, you'll notice symptoms like rough idle, pinging or knocking engine sounds, an increase in emissions, poor fuel economy, hard starting and even stalling. Without some troubleshooting, though, these same symptoms will mislead you into replacing an otherwise good EGR valve, solenoid, or miss a simple solution to your problem. Here, we take a look at a simple procedure to troubleshoot a potential bad EGR valve, and a few tips to do some system cleaning, if necessary.Whakatohea legends
In either case, I'd recommend you buy the vehicle repair manual for your particular make and model, if you don't have one yet. The manual will help as a reference, either now or later, to identify the exact type and components you have in your EGR system; help you in identifying passageways for cleaning the system, including the valve itself; and the correct steps if you need to replace the EGR valve.
Not to mention all the help you'll get in future maintenance and repairs for your vehicle. You can get fairly inexpensive aftermarket repair manuals from most auto parts stores or online.
Or, if you don't want to buy the manual now, look up a copy of the manual in the reference section of your local public library. And one more thing. Here, we'll deal with vacuum controlled EGR valves found in old model vehicles and some newer models using hybrid vacuum-electronic controls.
New vehicle models come with electronically controlled valves, though about six different types of EGR-valve control configurations exist today, and some late model cars have rid of the EGR valve entirely. Still, you can follow this guide along with the procedure described in your vehicle manual to test your EGR valve, if necessary. To apply one of the tests to the EGR valve, you'll need a vacuum pump, which you can borrow-rent from a local auto parts store, if you don't have one.
Other than that, you'll only need to use some common tools if you need to clean carbon buildup from EGR system passages. The EGR system in your vehicle uses the EGR valve to introduce measured amounts of exhaust gases back into the combustion chambers. These gases lower combustion temperatures. And lower combustion temperatures mean lower emission of harmful NOx oxides of nitrogen gases. However, exhaust gases shouldn't flow continuously into the cylinders. Once the engine has reached operating temperature, gases begin to flow gradually as engine speed increases.
When this flow pattern fails, you begin to notice a decline in engine performance. For instance, this will happen if the EGR valve fails to close completely as the engine idles, or fails to open when engine speed increases. Unfortunately, problems in the EGR system and valve will happen sooner or later. Overtime, small carbon particles contained in the exhaust gases begin to stick and accumulate along EGR and intake system passages, clogging tubes, exhaust gasses channels and the EGR valve itself.
Eventually, this will affect the valve's plunger mechanism as well, causing it to stick open or close. On top of that, EGR parts and components wear out and stop functioning properly.
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