Wells Ford EGR DPFE Training with Sgt. Tech P0400, P0401, P0402,

[@GoTechTraining]

Thank you for the kind words. Isnt the information available today amazing. I started repairing professionally in 1975, having any information then was a God send. These are different and wonderful times. Take Care, Mark Hicks Wells Vehicle Electronics

[@GoTechTraining]

Thank you for the kind words. By introducing small amounts of inert exhaust gas into the combustion chamber, the combustion flame front is slowed. Which reduces the adiabatic flame temperature without reducing combustion piston pressure. I hope this helps. If you need a more detailed explanation, please let me know. Mark

[@GoTechTraining]

3. If the voltage of the sensor increases but the RPM does not change, remove the hose of the sensor marked HI and check for the presence of exhaust pulsations from the tube of the pipe. If necessary, have an assistant restrict the exhaust at the tailpipe. 4. If there is no presence of exhaust at the nipple, use shop air to blow back down through the pipe attempting to unclog it of carbon. Replace the pipe if necessary.

[@GoTechTraining]

5. If the DPFE sensor voltage is high with the EGR valve closed, verify that the Grey/Red (GY/RD) wire of the DPFE sensor is showing to be a good ground. 6. If the ground checks to be ok, check the Brown/Light Green (BR/LG) wire of the sensor for a possible short to another circuit in the harness causing the voltage input to the PCM to be high. Mark Hicks Wells Vehicle Electronics

[@GoTechTraining]

1. Check the static voltage of the DPFE sensor with the engine idling. A typical voltage will indicate 1.0 volt. A reading between 0.5-1.2 volts would be considered OK. 2. If the sensor voltage is within range when the EGR valve is closed, open the EGR valve with a vacuum pump and check for the voltage of the sensor to increase along with a drop in engine RPM.

[@GoTechTraining]

Jim I have to agree, when EGRs were first introduced they actually reduced the power the engine could produce. I have to be honest, there was more than one time I personally removed the EGR valve and made a plate to put over the hole in the intake. However, today regulating the amount and when to introduce the exhaust gas to the cylinder has become a science. Removing the EGR valve today will have the opposite effect. Mark Hicks Wells Vehicle Electronics

[@GoTechTraining]

If the vent solenoid is OK, check the charcoal canister for any restriction. Repair/replace as needed and retest. The most common of the uncommon is the vent solenoid. Hope this helps, Mark Hicks Wells Vehicle Electronics

[@GoTechTraining]

It sounds like the catalytic converter might be restricting exhaust flow. when the cat starts to restrict flow the symptoms you mentioned above will occur, also the hoses from the exhaust pipe to the DPFE will get very hot when this occurs. If the cat is plugged, you must also find what caused it. For example, miss fire, running rich or lean etc. I hope this helps, please let me know what you find or if you need further assistance. Mark Hicks Wells Vehicle Electronics

[@Titans2138]

NGK Technical Training It's pretty amazing that you still answer questions on a video that's 10 years old. You're a good dude. Every EGR I've seen in videos has a seperate DPFE but I think on my car (2011 Crown Victoria) it's part of the EGR assembly or module. Also I can't figure out how to use my vacuum pump to test it. DPFE voltage is good, I tried to the clean out all of the carbon about 3 times. Before my last cleaning attempt if I used to a test light to jump the EGR Valve signal to battery ground the engine would run rough but not stall and now when I jump it to ground with my test light it immediately dies. I have a number of codes I'm trying to get rid of: P0053, P0059, P0401, P0457, P2197. I originally only had a P0420 when I got the car which went away with a bottle of redline fuel system cleaner so another idea I have is thats some of these problems are just from the bad cat. My Bank 1 Sensor 2 voltage readings mirror the sensor 1 voltage readings instead of holding steady. Those sensors are new btw. Thanks and one more thing, on my scan tool live data, when I hit the gas my EGR Error PID usually flashes -100%, then a number like -45% and then it shows, specifically, 99.2% for a second or two so I guess it's not closing in a timely manner

[@GoTechTraining]

Hey, thanks man! Sounds like a lot of issues going on. Let's start from the begining. The O2's should not mirror. That sounds like the cat's not doing it's job. P0053 is a heater resistance code for B1S1. P0059 is heater resistance for B2S1. P0401 is insufficient flow detected from the egr system . P0457 is an EVAP code. P2197 is B2S1 stuck lean. First thing i'd do is clear ALL of the codes out and see what comes back. From there, go after the 02 issues. Verify power and ground for each of the heater circuits. It's possible the heater fuse may be blown? Good luck! Mike Becker, Senior Technical Instructor

[@Titans2138]

NGK Technical Training Thanks for your response, I’ll check the O2 sensor power and ground. I’ve been trying to fix these problems myself for a little while now and I’ve cleared the codes a number of times. The heater circuit codes and the egr codes always come back. I’m learning a lot working on the car but I can’t seem to actually fix anything.

[@GoTechTraining]

Hahah sometimes the lesson comes before the repair! It's possible that maybe the EGR codes setting due to on 02 sensor issue. If the PCM is looking for a reaction from the 02 sensors during EGR flow...and the O2's aren't working right, then maybe the car thinks there's no EGR flow!? Mike Becker, Senior Technical Instructor

[@Titans2138]

NGK Technical Training Forgot to mention I’ve checked the fuses multiple times. That fuse is okay o2 sensors, egr, evap are all in same circuit. I’ve read it could be a pcm issue

[@Titans2138]

NGK Technical Training There probably no way for you to diagnose my egr in this forum but I do have one question that I can’t seem to find a lot information on and that is regarding interpreting the scan tool PID called EGR_ERR. When I hit the throttle it quickly flashes a -100%, then it flashes couple values like -33% and -42% but when I let off the throttle it goes to 99.2% for a second or two. In Motor magazine it mentions that 99.2% means that’s the egr valve is stuck open so I’d guess that my valve gets stuck open for a second or two so it isn’t closing in a timely matter which may be why I usually have a p0401 code although that code is for insufficient flow and it seems like if that was the cause for an egr code it would be for too much flow not insufficient flow. If it helps my get some free advice you should know that all four of my brand new o2 sensors are NTK brand

[@GoTechTraining]

1. Connect a vacuum gauge to any manifold vacuum port and start the engine. 2. Compare the engine vacuum at idle to a vacuum reading at 2500 RPM in park. 3. If the vacuum reading is lower at 2500 RPM than at idle, suspect a restricted exhaust. Check actual exhaust backpressure looking for no more than roughly 1 PSI at 2500 RPM in park on either bank of the engine. If high backpressure is found, replace the restricted catalytic converter(s) as needed. Mark Hicks Wells Vehicle Electronics

[@GoTechTraining]

@MsMlarrea 3. Check for a possible backpressure issue which may be damaging the sensor because of exhaust heat melting the sensor internally. To check this, connect a vacuum/pressure gauge to the DPFE sensor tube that connects to the sensors "HI" port. Monitor the reading while brake-torquing the engine. Backpressure should not exceed 2 PSI. 4. If the DPFE sensor connector is ok and there is not excessive exhaust backpressure, replace the DPFE sensor. Let me know, Mark Hicks Wells

[@GoTechTraining]

@MsMlarrea 1. Inspect the connection of the Differential Pressure Feedback EGR (DPFE) sensor for good contact to the sensor. 2. Check the Brown/White (BR/W) wire for 5.0 volts to the sensor when the Differential Pressure Feedback EGR (DPFE) sensor signal reading is high, and, that the Grey/Red (GY/R) wire is a good ground. go to next response

[@rsulich]

The delivery is a bit hokey but the information is valuable and on spot.

[@GoTechTraining]

The voltage readings you are getting now are correct. You can clear the code and see if it returns. Let me know if you need any further assistance. Mark Hicks Wells Vehicle Electronics

[@GoTechTraining]

@MsMlarrea I am not sure if AutoZone can do it or not. I think they only test components off the car and that is also limited. they do have a loaner tool program and maybe you can use a meter that way. Mark Hicks Wells Vehicle Electronics

[@GoTechTraining]

@rb26capri Black soot or smoke coming out of the tailpipe only decreased when disconnecting the EGR because you stopped the recirculation process. The black smoke is cased by another reason. I would first check the Mass air Flow , Oxygen and coolant temp sensors. Air intake temperatures have very little if anything to do with combustion temps. I suggest listening to what i am telling, if you do not take care of this problem you will also ruin your catalytic converters. Also change your oil.

[@GoTechTraining]

@markjhicks Since then many advancements have been made and in fact disabling the EGR system on today's vehicles would be a mistake for several reasons. First it will set troubles code(s) and you will fail an emission test. But foremost the EGR system helps cool cylinder combustion temperatures to prevent NOx formation and by doing so it improves performance and fuel economy. Thank you for watching and your comment, Mark Hicks Wells Vehicle Electronics

[@GoTechTraining]

@rb26capri I believe you mean EGR. In the future please refrain from using foal language. I dont want our young to think this is the right way to communicate. But your question is a valid one and I am sure many think the same. When the EGR system was first designed and incorporated it did take away horse power and lessen fuel economy. In fact I had disabled the system on many vehicles myself. But you have to remember it began in 1972 that was 39 years ago.

[@alanmoore78]

I do wish I had been able to watch this video back in 2006-2007 when my wife had constant EGR and DPFE codes set in her '99 Taurus. But now anytime I have an EGR issue I can refer to this and your other videos and make it right in one shot. This also explains why I am having codes on my Suburban after a fuel pump replacement. I bet something wasn't put back together right, maybe the pressure sensor isn't connected right. Time to drop that tank and check the shop's work!

[@GoTechTraining]

@weail I know a recruiter who wants your information! Thanks for the comment, I am happy you enjoyed the video as much as I had making it. Mark Hicks Wells Vehicle Electronics

[@GoTechTraining]

@youpaynow78 These trouble codes usually mean the engine is running very lean. Depending upon what kind of vehicle you have common failures can vary greatly. What is the year, make, model and engine size? Mark Hicks

[@GoTechTraining]

I think you are asking if fuel economy will drop if the EGR is not used. The answer is yes, not to a great amount but yes it will. I hope this answers your question, if not let me know, Mark

[@GoTechTraining]

You need to first check it to see if it is a fuel or spark problem causing the misfire. As easy thing to try first is to connect a timing light to each spark plug wire while the engine is running. then watch the light to see if it flashes. If it doesn't flash or if it is skipping it is a spark problem on that cylinder. Mark Hicks Wells Vehicle Electronics

[@GoTechTraining]

@markjhicks The black is because the engine is running rich. Fuel will get into the oil past the rings. I honestly have nothing to gain from this. I dont care who's parts you use but if you dont take care of this the right way it is going to end up costing you a lot of money. If you would like to talk about it, I would be happy to help you. Just go to our website, click the link in the video description, and go to the bottom of the page. Call my 800 number. Mark Hicks Wells Vehicle Electronics

[@realjaxon]

I have a 2002 SEL DOHC 3.0 Duratech Taurus. Where is the DPFE (Delta Pressure Feedback EGR) sensor located ? I can't find it.

[@GoTechTraining]

Hey, from what I'm seeing it appears to be on the passenger side of the vehicle near the firewall. Mike Becker, Senior Instructor

[@TheCoatneyadkins]

so if you were to somehow bypass the ECM and open the EGR with the engine running the signal voltage from the dpfe sensor would rise ?? and I guess at the same time if the idle doesn't get rough you could assume you have a blockage?? am I correct in this?

[@GoTechTraining]

Hey, If you open the EGR and the idle doesn't change then yes, you would either have a blockage or a bad EGR. A fully open EGR at idle should almost make the engine stall out. Mike Becker, Technical Services Instructor

[@stephencarlsten2329]

How would a leak at the base of the manifold with the EGR line affect the DPFE reading?

[@tbone2859]

Excellent explanation! Thank you for the video

[@GoTechTraining]

What was the code number? Please again tell me the vehicle, year, make, model and engine size. Mark Hicks Wells Vehicle Electronics

[@GoTechTraining]

@MsMlarrea Because of the extreme change in temperature between the exhaust and engine, it is not uncommon to get moisture in the DPFE. However, this moisture does a lot of harm. I would first make sure the you have a good connection and see if that takes care of the light. If it does not, turn the key to the "on" position and check the voltage on the signal wire from the DPFE if it is over 1.2 volts it is defective. Let me know the results of the testing, Mark Hicks Wells Vehicle Electronics

[@GoTechTraining]

What do you mean by "gutted"? If you mean you cleared it out and left the shell, you will have to start by replacing these parts. Mark Hicks Wells Vehicle Electronics

[@GoTechTraining]

I want to first apologize for the slow response, I have some medical issues. Well, you have a not so common problem. Check the canister vent solenoid hose for any obstruction and clean or repair as needed. If the vent hose is not restricted, remove the canister vent solenoid from the canister. Verify that it is open and free of any restrictions. If not, replace and retest.

[@moseslopez12]

Best explanation ever thanks soo much

[@GoTechTraining]

Thanks for watching Moses! Mike Becker, Senior Technical Instructor

[@GoTechTraining]

@angelalynn82 I have attached a video that demonstrates how to clean the EGR ports on a 3.1 GM. The attachment is below the video area. Mark

[@pnwjdm]

hello i also have a 02 ford escape v6. i had a problems with the egr blowing up and loss of power so i had gutted the rear cat, egr valve, dpfe valve, egr pipe. now i cant pass emissions because i have a cel code and it says i have a high volt dpfe. the dpfe valve is new. what can i do? will your brand of dpfe valve fix it?

[@crissy7503]

I have a question, what else I could look for to solve my problem, I have a 2002 escape 6 cyl it does not have power, if I drive it with out pushing hard the gas pedal, it is fine but if I need to step on the gas, it just does not respond properly, I have replaced spark plugs, DPFE Sensor, EGR Pipe, it was good for a couple of days and then it went back to the same , no power any sujestions ? thanks in advance

[@robbedoes1985]

hey. i see he did not need a more detailed explanation, but i do, i am a engineering student and i would like to know how te system exactly works, i would also be happy with some links to sites with serious explanations, or simulations.

[@MrBrownstone6485]

Is it possible for the EGR DPFE to become clogged and cause poor performance? I have a 99 Expedition with a 4.6L engine and upon removing a hose from the dpfe i found particles of the hose to be spewing out and i would assume into the dpfe while connected. My truck has been running poorly and my fuel mileage has been cut in half!

[@OldSchoolNoe]

Great explanation, was also entertained!

[@pnwjdm]

@markjhicks i gutted the cat at first and installed the shell then i replaced with the 4th one ive bought because ive replaced almost everything thats part of the emissions system. but now i still cant pass because of the dpfe high volt code. what can i do to fix it?

[@jadesmith7732]

I hve 01 ford explorer sport will a dfps cause a no start

[@alphaautorepair5280]

How would a blockage explain excessive egr flow no one mentions this anywhere on YT...

[@GoTechTraining]

I'm not sure I follow. A blockage causing excessive flow? Are you talking about a vehicle like the Honda 3.5L or the Ford 3.8L where there are individual EGR ports for each cylinder? I blockage, caused by carbon buildup, can lead to too much EGR going into the other cylinders causing excessive flow. Make sense? Mike Becker, Senior Technical Instructor

[@alphaautorepair5280]

@@GoTechTraining 1998 ford 4.6 v8 getting p402 excessive flow EGR is functional but there is constant vacuum causing idle conditions I don't have a scope so it makes this more difficult someone got in there before me and messed with everything I'm going to make sure it has the right vacuum line on it hoping they just swapped them out, if not it could be that delta thing or debris in the EGR vacuum controller just wanted your 2 cents ty.

[@GoTechTraining]

I honestly would not know. Pretty tough to do considering you may have 200 parts per million HC in the exhaust. Good luck, if you figure it out let me know! Mark Hicks Wells Vehicle Electronics

[@bushdzl04]

by far the most informative/detailed video on the EGR.. confused on how exhaust gas cools the intake air..does it go through a cooling system not showed here? any help would really help..thank you.

[@edwardbaker1331]

It is not really cool. It is just a convenient source of what has become relatively innert gas since it has been burned already. That's why it can be used to reduce the overall temperature of combustion.

[@rogerbradshaw2834]

I have a 1999 f150 4.6 truck. Engine lights been on couple years.then it started running bad started cutting off when im setting steal. I had it check found a bad pcv v.so I fix it ; now it don't cut off , but when I start driving giving more gas it kicks back like it don't want to go.Had it check said EGR V.so I put a new one on.it still does the same thing.and it still says its the egr V.can u help me?

[@GoTechTraining]

What code is it setting? If the codes are P0171 and P0174 try cleaning the MAF sensor. Mark Hicks Wells Vehicle Electronics

[@jaymagick1197]

hey guys, i got a couple questions... 1. Lets assume im a normal person with just a socket set and some free time and want to save money..i dont have any vacuum testers, no volt meters..nothing...i have a 2000 ford expedition 4.6L V8. for the last year, its been running sluggish but hasnt been throwing codes even after the car randomly loses and gains RPMs as i brake and sometimes shuts down when on an incline at a stop...(may be a separate issue but felt the need to say this for a background), i assumed it was mass airflow, tps,etc because the catalytic converters have failed previously...anyway, recently, the P0401 code starts coming up and im clueless on what it is and where its at, after watching a few videos, i see that its not a hard fix neccesarily but need assiantace on where to start first....with NO extra toold other than sockets and such to gets parts off and replace, where should i start? EGR valve itself? EVR? DPFE? lets assume the hoses are fine. Where are places to look for carbon buildup? Also, lets assume the problem gets fixed with a simple replacement of an EGR or DPFE, will the engine light go away or does it need to be erased with a scan tool?

[@GoTechTraining]

Hey Jay, DPFE's are super common on Fords. If you are looking to "try" something....that's a starting point. As for everything else, I believe you should take this thing into a shop. Sounds like you may have an issue that you are lacking the equipment to diagnose. If you repair the problem the code will not turn off immediately. It takes multiple (10+) test passes to clear the light. This could take a week or more. Disconnect the battery, or better yet, have the codes cleared with a scan tool. Thanks. Mike Becker, Technical Services Instructor

[@GoTechTraining]

@MsMlarrea I will need the year, make model and engine size of your vehicle to help. Please include the codes again with your reply. Mark Hicks Wells Vehicle Electronics

[@twillis1986]

Mark I have a 04 focus w/ a 2.3 code showing is a p1450 manufacture code where should I start?

[@TylerDWard]

Please explain how adding exhaust gas would keep the temperature below 2500 degrees. That goes against all common sense, as well as being incorrect by saying it adds power. Colder air intake more power. All this does is make the engine have to add too much fuel to the intake to compensate for too much exhaust gas when it fails. Am I correct? Using more gas = worse for the environment.

[@GoTechTraining]

Hey Tyler, so when exhaust gas enters into the cylinder it's inert. It's filler. Now we can't add as much air/fuel. Less air/fuel means reduced temperatures. Not sure where it says EGR adds power, but that's not the case. The computer does not add more fuel with EGR. It adds less. Mike Becker, Senior Technical Instructor

[@GoTechTraining]

@weail LOL getting you an F15 ... Now that might be a challenge! Thanks Mark

[@angelalynn82]

How do you clean an egr system?

[@on-d]

Can I replace the dpfe sensor with a map sensor connected to the exhaust? Isolating the hose attached to egr?

[@GoTechTraining]

Hi On-D Off Road, no you would not want to do that. Both of those DPFE hoses go to different spots on the exhaust. One on the exhaust side and one on the other side of the EGR pintle. The goal is to read the pressure differential with the valve closed, and a similar pressure with the valve open. A map sensor would only be able to give you 1 reading at a time. Mike Becker, Technical Services Instructor

[@on-d]

Hello, grateful for your explanation.

[@GoTechTraining]

You're welcome! Mike Becker, Technical Services Instructor

[@xboxsk8]

What about the P1405?

[@jonathankent5898]

Here's a code they missed. P1405 DPFE sensor circuit upstream hose.

[@paulprice9272]

Am I the only one that has a knob that you can turn on the dpfe and can't find an explanation what the heck its about? 03 mustang gt. A year that is very trick to get exact info and what you do get sometimes is not really accurate. I think it has a lot to do with the romeo Windsor differences.

[@GoTechTraining]

@markjhicks I don't know if you can see the attachment or not, darn program they keep changing things for the worse, go to my channel the video is called GM P0401 EGR troubleshooting. Mark

[@johndunston2394]

good video

[@GoTechTraining]

+John Dunston Glad you liked it! We are making new ones all the time. If you head over to our website you can subscribe and get an email every time when we make a new live video. www.wellsve.com/ Mike Becker, Technical Services Instructor

[@edwardkozak4107]

you are the best

[@GoTechTraining]

Thanks for watching Edward! Mike Becker, Technical Services Instructor

[@bushdzl04]

makes sense..thanks..

[@heavyarms117]

good question

[@KennethRinderhagen]

Here is a pic of a 1995 Lincoln town car intake manifold with a clogged EGR path just under the throttle body neck. To be sure to avoid allowing any particles from entering the the combustion chambers, i removed the intake manifold. After replacing the EGR valve, Delta sensor and EGr solenoid it still posted a P0401 trouble code until i cleaned manifold passage and insured all passages were clean. Now it gives a P0402 excessive EGR trouble code. will have results on its diagnosis Monday. i755.photobucket.com/albums/xx198/kayrikizzy/IMG_20150325_172512_zpsi2dfgrvp.jpg

[@BMC_self-invent]

I'm getting a P1400 code

[@StealthyWolfDaddyWerewolf]

Ford 4.6 is horrible for the EGR system. But I usually find its because of the iac valve not letting enough air to flow through.

[@GoTechTraining]

Hi Stealthy Wolf, thanks for watching! Ford's are common for that DPFE sensor to go bad and also engines like the 3.8l that plug up the egr ports in the intake manifold. Mike Becker, Technical Services Instructor

[@JamesAutoDude]

That's true. I mean, the newer vehicles are better with it... But for instance, my 1987? hates it.. But yeah, the newer vehicles are fine with it I suppose. Especially with all the computers involved.

[@dannypalmer7701]

Sounds like same guy talking for the DNA on Jurastic Park movie

[@kenkappler7304]

I just about bailed at 9 seconds, but then I saw the comment just below mine. Thought I should give it a chance even if it is totally corny., Although it didn't tell me anything I didn't already know.

[@GoTechTraining]

Hey Ken, thanks for watching. Sorry, this is an older video that is a bit corny. Make sure to check out some of our more recent videos. Not cheesy! :) Mike Becker, Senior Technical Services Instructor

[@matthewjones6936]

he said combat applications group

[@JamesAutoDude]

It's funny because, the EGR valve only technically WORKS at cruising... So, how does it help it run when it's not active during idle or when there is a load? plus, during acceleration, you get more power when you DON'T have the EGR valve. Lol. It's all B.S. But whatever... That's just my opinion.

[@robz5435]

Never call an NCO (Non-Commissioned Officer) a "Sir." Only officers are called "Sir." In bootcamp, you'll be doing pushups for the rest of the day and become a favored darling for the Drill Instructors to hammer and attack for your little mistake.

[@dannypalmer7701]

Cut off my catalac converters for nothing!

[@GoTechTraining]

Hmmmm that's no fun! Mike Becker, Senior Instructor

[@Ashroyer86]

CHEESY

[@GoTechTraining]

Yeh, it kind of is. Check out some of our newer stuff. I think you'll find the info you're looking for. Mike Becker, Senior Technical Instructor

[@Ashroyer86]

@@GoTechTraining I watch your stuff Mike. It's pretty good.

[@GoTechTraining]

Pretty good is better than "cheesy" in my book. Thanks! Mike Becker, Senior Technical Instructor

[@jadesmith7732]

I hve 01 ford explorer sport will a dfps cause a no start