Dan Ferrell writes about do-it-yourself car maintenance and repair.
He has certifications in automation and control technology. Photo courtesy of dave 7 on Flickr. 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. 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.
Photo courtesy of Moosealope on Flickr. 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.It has to do with the emissions system and stands for:. The EGR system on a vehicle is responsible for recirculating exhaust gasses in order to lower the vehicles emissions output.
Most of the time there are not going to be symptoms when P is triggered, other than the service engine soon light itself. In some extreme cases, you may notice a slight ping or knock. Diagnosing what is causing the P code in the 6 is typically not very tricky. Here are the most common causes:. The good news with P is that it rarely ever costs much money to fix, and it is usually pretty easy to get the problem, since it is right on top of the engine.
That can be a mistake. Here are some of the most common fixes to help clear the P Testing your EGR system is relatively easy to do. The most challenging aspect is the DPFE sensor. By process of elimination, you can be relatively confident that the DPFE is at fault. If there is anything you would like to add about P, please feel free to add a comment below.
Good luck!! It has to do with the emissions system and stands for: The EGR system on a vehicle is responsible for recirculating exhaust gasses in order to lower the vehicles emissions output.P0400 EGR Valve Fault - - Step By Step Guided Repair
Related: P Mazda 6 Mazda 6 P Symptoms Most of the time there are not going to be symptoms when P is triggered, other than the service engine soon light itself. Service Engine Soon Light — P will illuminate the service engine soon light.
Knocking Sound — In certain cases, there may be a noticeable knock that comes from the vehicle. P Causes: Mazda 6 Diagnosing what is causing the P code in the 6 is typically not very tricky. Here are the most common causes: Blocked EGR Tube — The tube that carries the exhaust gases back to the motor may clog up over time. Alternatively, it can become bent or kinked. This is especially true if you are experiencing P right after doing some engine work. Check the tube and see if it is cracked, clogged or otherwise damaged.
But, they certainly are the cause of P often enough.There seems to be a problem serving the request at this time. Skip to main content. Do these parts fit your vehicle? Find out now. Hot this week. EGR blanking plate Ford 1. All Auction Buy it now. Sort: Best Match. Best Match. View: Gallery view. List view. Only 2 left. See similar items. MAZDA 3 1. Only 1 left. EGR Valve 2. Mazda 6 2. Fiat Mazda Mini Volvo 1.
How to Test an EGR Valve: A Simple Procedure
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This manual Propeller Shaft should be kept up-to-date. Page 3 The contents of this manual, including drawings and specifications, are the latest available at the time of printing, and Mazda Motor Corporation reserves the right to change the vehicle designs and alter the contents of this manual without notice and without incurring obligation. GI-7 GI— Therefore it may not contain the necessary reference service procedures to perform the service indicated in this manual.
End Of Sie GI— Serial No. Page 8 3 : In some models, there is a fuel pump relay that controls pump speed. That relay is now called the fuel pump relay speed.
All inspections and adjustments must be made by an expert repairer, we recommend an Authorized Mazda Repairer. Brake fluid Replace brake fluid. Page 13 DTC P F DTC P Page 14 DTC P F NO. If the voltage from accelerator pedal position sensor No.
The PCM calculates the deviation of the interval time for each cylinder. If the deviation of interval time exceeds the preprogrammed criteria, the PCM detects a misfire in the corresponding cylinder.
If the glow relay voltage is 4. Always carry out a total inspection of the input systems, output systems, and PCM to determine the cause of trouble. Page 46 Idle: Approx. Verify that the voltage at terminal B changes while applying the vacuum to the EGR valve as show in the graph. Specification 0.
Perform the necessary vehicle preparation and visual inspection. DTC troubleshooting completed. If the fuel pressure is lower after the fuel injection than the preprogrammed criteria, the PCM determines fuel system leakage. If the difference between the maximum and minimum value of the intake air temperature sensor No. If the voltage characteristic of the air flow sensor signal is out of the threshold, the PCM determines that there is a malfunction in the mass air flow sensor.
If the difference of the vacuum inside the intake manifold during middle engine speed and low engine speed is less than the threshold, the PCM determines that there is a malfunction in the manifold absolute pressure sensor characteristic.The exhaust gas recirculation EGR valve on your Mazda Tribute allows certain amount of exhaust gases to enter the intake system.
This helps lower exhaust emissions. The valve uses engine vacuum to operate a diaphragm, which may get stuck or punctured after years of service. To keep the system working properly, replace the EGR valve. Locate the EGR valve around the top of the engine. It is a flat and round metal valve, between 2 and 3 inches in diameter.
Raise the front of your Mazda vehicle using a floor jack. Place a jack stand under the frame on each side of the vehicle to support it. Detach the engine splash shield from underneath the front of the car using a ratchet, ratchet extension and socket.
Disconnect the EGR tube from the exhaust manifold. This tube is connected between the EGR valve and the exhaust manifold. Unscrew the retaining nut using a tube wrench.
Remove the air cleaner outlet pipe from the air cleaner assembly using a screwdriver. Use the tube wrench to unscrew the retaining nut. Unscrew the two EGR valve retainer bolts using the ratchet, ratchet extension and socket. Lift the valve off the engine and discard the gasket. Clean the engine sealing surface of any gasket material using a plastic scraper. A metal scraper may damage to soft sealing surface and lead to exhaust leaks.
Set the new EGR valve in place along with a new gasket and start the two mounting screws by hand to avoid thread damage. Then tighten the bolts using the ratchet, ratchet extension and socket. Connect the new EGR tube to the bottom of the valve. Start the retaining nut by hand but do not tighten it yet.
Connect the other end of the EGR tube to the exhaust manifold. Start the retaining nut by hand, then tighten it using the tube wrench. Replace the air cleaner outlet pipe on the air cleaner assembly using the screwdriver. Attach the splash engine shield to the bottom of the engine using the ratchet, ratchet extension and socket.
This article was written by the It Still Works 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 Works, contact us. Step 1 Locate the EGR valve around the top of the engine. Step 2 Detach the vacuum hose from the top of the valve with your hand. Step 3 Raise the front of your Mazda vehicle using a floor jack.
Step 4 Detach the engine splash shield from underneath the front of the car using a ratchet, ratchet extension and socket.Millar has been an online writer for over eight years.
She is well versed in website development with several websites she has created. The EGR valve is an integral part of the emissions control system in automobiles. It reduces the production of NOx One vehicle produced by Chrysler doesn't require it.
When an engines internal temperature reaches F degrees the combustion process starts to produce NOx nitrogen oxide. NOx is then expelled into the atmosphere via the exhaust pipe. Once in the atmosphere it is what is referred to as "air pollution". We breath the air, right? So NOx in the atmosphere is not good. That's where the EGR valve comes into play. It is designed to reduce the amount of NOx emissions from automobiles. This is accomplished by recirculating a portion of the exhaust.
Engines have a small passage between the intake and exhaust manifold. The EGR regulates this passage. When the valve opens, the engine draws in the exhaust through the EGR valve and puts it through the combustion process again. This causes the combustion temperature to decrease enough so NOx will be kept to a minimum. If you hear "pinging" upon acceleration or erratic idling in your engine you should check the EGR valve for clogging or replacement. All that recirculated exhaust builds up carbon in the valve which can make it stick in the open or closed position.
If you've decided to clean the EGR valve or replace it all together, you'll need to locate it in the engine compartment. It is located on the intake manifold. What and where is the intake manifold you ask? I had a feeling some people may not know exactly where this is, so let's take this from the top down, just as if you had opened the hood and you're looking at the engine:.
The reason it's attached to the intake manifold, is so it can intercept the exhaust and recirculate it. If you decided you'd like to try cleaning the EGR valve first, great!
I always make an attempt at cleaning a part to see if that will fix it before I go and blow any cash on a new one. The more use you can get out of a part, the better.
Waste not, want not, right. There are two kinds of EGR valves; the mechanical type and the electronic type. First I'll go over cleaning the mechanical type:.
I always enjoy hearing from my readers! But I cannot answer each and every question asking where the EGR valve is on their particular vehicle. Read this article carefully, noting the pictures of an EGR valve, and apply what you read to your particular vehicle. If you still can't find the EGR valve, then go ahead and post a question to me and I'll try to help.
Content is for informational or entertainment purposes only and does not substitute for personal counsel or professional advice in business, financial, legal, or technical matters. They haven't moved the EGR and if they did, it's nearby. Question: Where is the E.Even off the show, the Lavender Ladies alliance is alive and well. She made a game move that ended up back firing a bit for the game-sake, but it still ended up positive.
She was able to sneak by LaToya in an elimination the week before, but Kailah as a competitor is on a completely different level on the physical spectrum. Watching Sylvia turn on the switch in her elimination with Kailah and never give up showed she had an incredible amount of heart. The elimination arena is where the game becomes real, and you must play for yourself.
If Sylvia could gather that same amount of fight and drive consistently in the daily missions, she could have a great showing on Vendettas. However, since Invasion she has gotten in much better shape and is looking stunning. She will be turning heads with her looks and will be doing better in competitions.
Standing around 5'5, Sylvia played sports growing up like most people. The goal for Sylvia is to be in the middle of the pack. Her best game could be staying under the radar. And she needs to never finish in last. After people questioned her abilities on Invasion, finishing last would only pour gasoline to the Sylvia is weak fire.
She can do puzzles and is quite intelligent. Sylvia flat out sucked in multiple daily missions on Invasion. Then again, she also does these shows for fun, so it might not matter at all.
Her social and political game might be weak because her two female best friends (Amanda and Ashley) are taking a break this season.
She has enemies from past seasons (Nicole, Kailah, and Tony). Her best friend in the house is Shane, who consistently looks out for himself over others. Sylvia needs to be a social butterfly and make some friends in order to have any type of political power in the house.
Good competitors have crumbled in the elimination arena. Sylvia has thrived in those situations. A good performance for Sylvia would be making it to the halfway point having seen no eliminations and not losing to anyone perceived as weaker than her. If Sylvia lost to Jemmye or Natalie, it would be a bad season for her. In terms of her chances of winning.
They are almost non-existent. She struggled mightily in the mini final on Invasion. There is a path for Sylvia to make the final and make money. She needs to do average in the challenges, wait for the fat to be trimmed, and then hope for Kailah and Cara Maria to go to war against each other.
Let the powerhouses fight each other, sneak under the radar and take their spot in the final. SportsThe ChallengeMTVTelevisionReality TVBlockedUnblockFollowFollowingAllan Aguirre21 years old.
Mazda 6 Workshop Manual
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