How to Clean and Replace an EGR Valve P0400

Clogged or Low Flow EGR? Learn how to clean carbon buildup in the EGR valve which can cause check engine light codes P0400 though P0408. I also show you how to test your EGR valve to make sure it is working properly or if you need a new one.
Where I got my EGR Valve: www.carpartkings.com/emission-...
The OBD2 Scanner App I used: • BlueDriver OBD2 Diagno...
Where to get the OBD2 Scanner I used: amzn.to/1XNUGfz
EGR Codes:
P0400 Exhaust Gas Recirculation Flow Malfunction
P0401 Exhaust Gas Recirculation Flow Insufficient Detected
P0402 Exhaust Gas Recirculation Flow Excessive Detected
P0403 Exhaust Gas Recirculation Circuit Malfunction
P0404 Exhaust Gas Recirculation Circuit Range/Performance
P0405 Exhaust Gas Recirculation Sensor A Circuit Low
P0406 Exhaust Gas Recirculation Sensor A Circuit High
P0407 Exhaust Gas Recirculation Sensor B Circuit Low
P0408 Exhaust Gas Recirculation Sensor B Circuit High
How to Flush Power Steering Fluid: • How to Flush Your Powe...
How to Replace an Oxygen Sensor: • How to Check and Repla...
How to SUPER CLEAN a Windshield: • How to Super Clean You...
*If the video was helpful, remember to give it a "thumbs up" and consider subscribing. New videos every Thursday*
-Website: www.ChrisFixed.com
-Facebook: / chrisfix8
-Twitter: / chrisfixed
-Instagram: / chrisfixit
-Subscribe Here: kzbin.info_c...
-KZbin Channel: / chrisfix
Disclaimer:
Due to factors beyond the control of ChrisFix, I cannot guarantee against improper use or unauthorized modifications of this information. ChrisFix assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. Use this information at your own risk. ChrisFix recommends safe practices when working on vehicles and or with tools seen or implied in this video. Due to factors beyond the control of ChrisFix, no information contained in this video shall create any expressed or implied warranty or guarantee of any particular result. Any injury, damage, or loss that may result from improper use of these tools, equipment, or from the information contained in this video is the sole responsibility of the user and not ChrisFix.

[@DrGT18]

This is, by far, the best how-to video I’ve ever viewed. Lighting was great, volume and enunciation were excellent, explanation was clear and practical, and the video covered every part of “Where is it?”, “How to remove.”, and “How to install.” without all the other filler that most videos try to add to make themselves sound smart. Now I’m rambling. Great job with this video! I can imagine it’s helped hundreds of people!

[@tjstraw1]

I like how thorough he is, but not overwhelming at the same time.

[@davet8259]

that one of the best videos i seen on you tube on the egr no silly music clear instructions.

[@chrisfix]

Thanks dave

[@CNGaming101]

Dave T I’m bout to drop one 👀 hopefully it’s clear too

[@ziuhenri1122]

@@chrisfix Hi Chris, do you still have the corvette?

[@automotivelane]

H. Black I think he still does he posted a vid on it 3 weeks ago

[@relevation0]

Yes, never do music lol, and we got shit to do so straight to the point is great

[@ericramirez5181]

you literally have videos of everything vehicle related, we love to see it💯

[@stroys7061]

As always, great instruction on removal and installation as well as how it works. The camera work is outstanding. And I really appreciate no obnoxious music.

[@LarsSveen]

You really put a lot of effort into these videos and it shows. Good job, man. I'm sure you've helped many people save time, money, and frustration.

[@trashin.n.smashin]

I'm so glad I found this. Everything I've read about how to test the egr involved a pressure pump, push and hold finger on port and see if it holds pressure is so much simpler considering I have no pump. Thanks!

[@labradormcgraw2409]

It was this video that really got me into watching this channel. It taught me exactly how to solve my EGR issue successfully - first time! You just can't beat a ChrisFix video.

[@avalon629h]

Thanks Chris! My Lances was doing crazy things at idle. Ends up the EGR valve was so clogged up that the diaphragm couldn't move at all. Once cleaned, it moved great and kept a good vacuum. You are the man!

[@elivarney7148]

Hey Chris just wanted to say you made a great video. It was very informational and real simple to follow.

[@polyscient]

You're evolving in your editing style and side notes for how to mitigate possible issues different from your own. Your're doing a great job Chris, thanks. Educational and interesting even though I don't have that exact problem yet. Keep it up buddy.

[@SkryAxis]

***** yeah hes probally the best youtuber for car repairs

[@chrisfix]

Michael Thompson Thanks a lot Michael! I try to improve my style and content in each video I do (which is very hard sometimes). I am glad you see improvement! This comment made my day! Thanks!

[@chrisfix]

***** Thanks bud! I am glad you like the closeups!

[@chrisfix]

Skry Axis Thanks man! It means a lot!

[@jimclayton4254]

ChrisFix have a 99 4.3 vortec just took motor out of another bazer run great 100*** miles onit put in another 1 that was runin just bad now fuel pump workn got gas up to in line at throtl body no start pour lil fuel in starts up til runs it out everything hooked up

[@anthonym612]

Thoroughly cleaned a bunch of years worth of gunk /carbon from my Saturn's ERG valve using carb cleaner and an old toothbrush. She's running like a champ - thanks Chris.

[@damianp564]

I really appreciate the video, Chris. You've helped me a lot. I have a 95 Caprice. Looks like it uses the same EGR valve as yours. Got it off today (with the help of WD-40, those nuts weren't budging). Glad I had a variety of same size wrenches as it was too tight back there for certain widths and lengths. Turns out I need a new one. Tried cleaning as per your instructions (it was gunky) but the valve just won't hold a vacuum. Waiting on a new part. The markup at local major parts shops is quite steep, $30-40 more than Rock Auto and Amazon. For those that want to check their EGR valve I suggest getting a new gasket before hand as well as a telescoping mirror. A Fel-Pro for this model is about $2. Unlike Chris' my gasket was well worn and baked on. Had to pry it off and clean the mating surfaces. The mirror really came in handy as I could not otherwise see back there without taking photos.

[@BGroothedde]

You, sir, are awesome for sharing all this information. I had basic education in car mechanics as an assistant car mechanic about 6 or 7 years ago, which is enough to keep my own car running. You're sharing information about stuff that might be very useful in the future and quite a lot of tips I never knew of, thanks!

[@chrisfix]

+Bas Groothedde No problem! Glad the videos are helpful and you are learning a lot!

[@snapfish89]

Oh yeah, I'm going back in time. Love your channel, been a long time fan! . Just bought a ranger 3.0 for a beater with a heater. When I look up vids, yours always pops up!!!

[@larryferguson3387]

CHRIS is a fountain of knowledge! Where does this come from??????? He presents himself clearly. Thank you Chris

[@imgadgetmanjim]

Out of all the EGR videos I watched, yours is the best. Video quality excellent, explanation and facts very nicely presented. I really enjoy watching your videos. Thanks a lot.

[@LTT.Official]

I had no idea there was something like this in a car lol, oh well I guess you learn everyday. Thanks for the high quality stuff as usual Chris. Definitely helps me understand my car better.

[@chrisfix]

***** Thanks a lot bud! Glad you learned something new! That is the goal!

[@Fedgery007]

Great vid! I love how you spend time to educate people with what things do instead of just changing the part!

[@chrisfix]

Jeffrey B Thanks man! I find it useless to just change a part if you have no clue how it works. Even if it is just the basics, I always want to know what the part does and how it works.

[@Alexanderbuilds2001]

Tatum?

[@pansarakariyawasam8686]

I just enjoy watching ChrisFix videos, even though I take my car to the dealership for each and every service, repair and cleaning. I just dont have time to do these on my own but the pure enjoyment of watching these videos brings me back to watch more! Nicely done and very professional. Keep up the good work!

[@hankbridges5055]

You are paying WAY too much!

[@xeatcrowsx]

Your video helped me finally get to the EGR. It was like scooping out 3 tea spoons of coffee ground. Thanks for everything you post.

[@humrod1852]

Dude, excellent video! Organized and thorough. Thank you!!

[@SGM260190]

I had my EGR coded out in my BMW 335D. The performance increase is negligible but it's one less point of failure due to carbon build up! (Also glad to see I'm not the only person that cleans their engine bay! :D)

[@chrisfix]

SGM 26 I wish it was easy to tune it out because I would have done that in a second. A lot of guys who get headers will tune out their egr. Im glad Im not the only one either lol.

[@steve5912]

@@chrisfix Alot of people that dont do anything to their cars delete their egr you guys are dumb.

[@optimoprimo132]

With almost 10 million subscribers i wonder just how many people Chris has helped with vehicles? Amazing stuff.

[@bradvincet1848]

If I didn't know any better, your videos makes working on cars an easy and enjoyable experience.

[@antiquelude]

Chris gets stoked when something breaks on his vehicles. New video coming soon!

[@cls63amgwagon34]

THIS IS PERFECT TIMING CHRIS!!!! Thank you so much!!!!

[@chrisfix]

Grant Rodgers Awesome! I am glad to hear!

[@fortforex7808]

Hi chrisfix. Thanks for your great effort. I don't have car but due to my field college as mechanical engineering student I watch your videos very day and that gives me extra edge in my studies thanks very much.

[@HONEYCOMB87901]

damn i love this guy videos he teaches so much and doesn't rush down anything he takes his time and explain everything i searched how an egr valve works and he explains it simple and even shows a diagram of it keep making videos bro nice job. im even buying tools now to practice what i learn on my car. thank you chrisfix.

[@F150fx2sporT]

Damn Chris, you keep that vette C-L-E-A-N!!!! Thanks for another helpful video!

[@chrisfix]

Victor Sanchez Thanks Victor! I do my best! Glad you like the video!

[@jackiechan_wtf4041]

ChrisFix Could you do a video on how to clean the engine bay? For some reason I keep staring at the shiny clean engine of the Vet. Keep up the good work Chris!!!

[@F150fx2sporT]

That'd be a great video!

[@geojor]

just a great explanation, thank you...

[@jrs33615]

Once again your video was extremely helpful, informative and detailed. I don't understand why some people feel the need to make ignorant comments on it but notice that those same people are the ones watching instead of filming their own vids... Keep up the good work!

[@SaddBoy23]

Just watched your video on brake pads. Needed help on EGR advice and did a search for it. I was just thinking this video was just as detailed as the other I had just watched. Then I saw the ChrisFix thing at the end and realized it was you again. Safe to say you're my guy now.

[@chrisfix]

+SaddBoy23 haha, I am glad the videos are helpful!!!!

[@danielaxtell787]

just changed out my EGR Valve in my 2000 mustang and hopefully my check engine light shuts off lol thanks for the video helped a lot!

[@fierogtfierogt2821]

Que falla te hacia el mustang daniel

[@brownie3454]

did it work

[@michaelplus-trojan_dc8687]

I hate these valves with a passion, my car was idling like i was pumping the gas, no shop knew what it was, everything from distributor til computer got replaced. No error codes. Turned out it was a stuck egr valve... replaced as a "well why not."

[@JORGEPARTY]

Stuck closed?

[@michaelplus-trojan_dc8687]

Stuck open just enough that it leaked like crazy

[@iwishtobetexan6060]

Dang bro. What kind of car you got?

[@michaelplus-trojan_dc8687]

@@iwishtobetexan6060 it was an Opel (Vauxhall) Zafira. Got rid of it a while ago

[@citizenken1207]

Extremely well explained, good video quality, great editing, great voice over and sadly my EGR on my Chevy P30 chassis (looks like a UPS truck made by Grumman) has extremely rusted nuts and studs. I am not even sure if I can see the threads anymore (PA vehicle and I am in NC). Anyways .. ordering a stud removal tool first and planning on having a second intake manifold in better shape handy. Great simple test for vacuum hold!

[@BrianFrichette]

The quality of this channel is unbelievable

[@miguelleal1829]

I will replace the vacuum hoes leading to the egr valve today, thank you for the help. very helpful video keep up the good work

[@MrJAa85]

+Miguel Leal You know how it is, the hoes need replacing every once in a while! Once they start leaking I'm on to the next, and just hope it's not contagious... Sorry, I had to xD

[@josephmadge7610]

Iwish my car had hoes...im stuck with hose.😆

[@ronanrogers4127]

There’s plenty of hoes in my truck!

[@AutoTechWorld_DIY]

My golf is running without it 👌. Great video

[@alexgarza5211]

Always the best instruction available, Thanks Chris for the Fix.

[@slipperysteve7837]

Superb tutorial bro. Clear and accurate. nicely edited too. Thanks for sharing your knowledge, & hopefully saving me any hassle when I do the same job on my new car bought an hour ago. All the best, Steve. Across the pond in Cornwall, UK

[@hankbridges5055]

9:40 Chris reflection in windshield!

[@Da-veed]

0:25 as well lol

[@lucatecchia2627]

There is a good reason cause he's trying to be anonymous

[@mayeri3083]

Looking good..

[@vacuumboy6.0]

Good looking guy

[@trevorolson9248]

Hank Bridges that’s how you can tell he doesn’t talk when doing the repairs he does commentary when editing the video

[@davejohnson3860]

I truly wish W211 EGR VALVE was ad simple! Good vide.

[@manbiteslife3110]

I feel you haha e200d w211

[@fabhtxr62019]

I don't think I have this but I learned a lot from your videos keep the channel up ChrisFix you make our lives more easy 👌👍👍👍

[@wsa405]

Super helpful!! Thanks again for your great videos....makes fixing my 2006 tribute easy, and you have saved me a fortune by not having to guess what my problems are!

[@flightofthefatman]

Fanks bro! I've been enlightened once more.

[@jwaits735]

Dude, your videos are sooo informative and well done! I'm having some issues with my car right now and I've never known much about cars. Your changing that for me with these videos. Thanks! #NewFan #NewSubscriber #KeepItUp

[@marianobotello1504]

The best.

[@willsbbqgarage]

I really like your videos. As a DIYer it is nice to find simple and descriptive videos that make sense. Keep up the good work and thanks.

[@chrisfix]

+Will Mogridge Thanks a lot Will!

[@tantran2994]

You are an excellent teacher ! Please show an easy to understand ways to test an electronic EGR valve. Thanks

[@billysimons28]

Thanks for taking my advice on wearing gloves man apreciate the videos keep them coming

[@chrisfix]

Billy Simons I listen to my subscribers! Glad you like the videos!

[@DENicholsAutoBravado]

Billy Simons I forgot to mention the same. Keep those toxins out Chris. We've both advised him friend. :)

[@alexl9334]

I use my trusty red gloves whenever i have a problem on the vette.

[@Adam-nv1wi]

Yesssss the new vid I've been waiting

[@chrisfix]

Illuminati is real YES! Took forever to edit!

[@ericheine2414]

That was great. Clear, concise, informative, the perfect video. Thanks man

[@GovtWatchdog]

The EGR issues I used to have in my '93 Chevy Blazer were insane!! Never had any issues to date with my '99 Ford Ranger, even at 200k miles.

[@AdmissionGaming]

That corvette is clean as fuck

[@RyanFGNM]

I wish more car owners where like this Exspecially if you but used vehicles.

[@claudesalk706]

Because Racecar Why??

[@claudesalk706]

Nice job again

[@kmliv4love]

So, Corvettes come installed with faulty Egr valves? Because this engine looks like it has no more than 100 miles on it.

[@nutz4gunz457]

Thankfully variable valve timing has made EGR valves a thing of the past. Good riddance to bad rubbish

[@chrisfix]

Nutz4Gunz45 Yea, it is amazing they could not come up with something better than injecting exhaust into the intake

[@Darren.G]

You sir, win the comment section!

[@steve5912]

@@chrisfix So delete it.

[@steppinout67]

@@chrisfix I think I have variable valve timing but it has an EGR valve. It's a 98 acura RL. You're saying if I have VVT I shouldn't have an EGR valve?

[@hawk_ness]

Modern cars still have ERGs for better emissions...

[@OldDocThedan]

Well done Chris. There are ample nearly useless KZbin videos out there about repairs. Yours was well done. Clear and understandable. Subscribed!

[@wanbestdribbler7342]

I didn't know about EGR function until Chris just nailed it, thanks Chris!...👍🏼👍🏼👍🏼

[@mannyperez900]

Omg Chris its like your read my mind that's what code came in my truck 😭

[@bena9495]

nice corvette man!

[@astrochef7766]

You explain it to me like I have no idea what the hell im doing and I THANK YOU FOR THAT ! Finally get it after this vehicle, very informative keep it up man !

[@williamhersman4394]

Dude, this is the best DIY video ever. I'll paraphrase the sergeant here, "Chris, you're a G.D. genius!"

[@Samoatupo]

Every time he says it’s really simple my brain starts shaking 😂🤣🤣

[@TheCardonainc]

🤣

[@ComandanteJ]

I'm in love with your 'vette.

[@chrisfix]

ComandanteJ Thanks a lot! Such a fun car!

[@temanalysis1270]

Excellent explanation! Wish all videos were this clear and well done!!

[@joeyppppppp2]

This guy Made this look so easy fixed it effortlessly and at the end gave me knowledge that will benefit me on every car I own. I have subscribed

[@chrisfix]

Thanks for subscribing! I am glad you find my videos helpful!

[@patricklafreniere9841]

new EGR Valve p0400 (MADE IN CHINA) Why you install chinesse piece on MERCIAN car I 'm offended (troll)

[@davethomson3834]

To stop the exhaust gas recycling valve clogging. If you have a 10 gallon tank, fill it with 9 gallons of diesel and 1 gallon of petrol. This acts in the same way as putting a can of fuel additive into the tank.

[@jamesdoe5824]

For a '96 that corvette is cleaaaaaaan

[@chrisfix]

Kaipo Fitisemanu Thanks!

[@GameTechUS]

+ChrisFix your audio is always excellent, what mic setup do you use or recommend? I badly need to upgrade to a good wireless mic!

[@chrisfix]

GameTechUS Thanks! I use this: amzn.to/1KuWozz

[@marcusvanshur8820]

By the way your videos are incredibly informative and easy to understand. I just recently started working at a Les Schwab and your videos have definitely made things easier to understand to perform accurate inspections for people who need to know what is going on with their vehicles.

[@chrisfix]

+Marcus Vanshur Thanks a lot! I am glad they are helpful!

[@marcusvanshur8820]

+ChrisFix Where did you receive your training?

[@vazza7504]

Another great video Chris, gonna take off and check and clean the one fitted to my jeep grand Cherokee 2.7 litre diesel here in the UK. Due another service come spring, this time including the fuel filter. Did the fuel filter near 20000 miles ago when I purchased the jeep. Thanks Chris. 😊

[@octaviodiaz9432]

Hey +Chrisfix , when I brake going above 70+ mph my steering wheel will shake bad but not violently. I have a 2004 Honda accord. Any idea what it could be? Thank you and I love the videos!

[@lemonjuicejk7360]

Octavio Diaz bent rotor

[@albertpacolli268]

Octavio Diaz its your braking discs

[@francoisdessureault4493]

9:44 I like to use some medium strength thread locker to prevent the nuts from loosening due to vibrat......wait what? I feel so empty inside.

[@williamcruz3303]

Chris what can I say love your videos I watch it like NCIS you never know what u will learn 🤗

[@eyejedi]

Yours is the best video I've seen so far, from other videos, on how to clean, the EGR, GOOD TEACHING, now I can clean my.

[@lowcontrast]

this video saved me 119.95 Thanks

[@chrisfix]

Awesome!

[@maruko7321]

+Tweekedout 119 what?

[@gittyupalice96]

lmao just got a brand new shinny EGR for my motor that probably doesn't give a shit anyway... And it cost a whopping $14.00 with free shipping from rock auto.. . Have yet to install it.. Because much like my engine, I don't give a shit.

[@Lysergic_]

@@maruko7321 probably US dollars because from what i've seen every other country in the world has the sense to just round up to 120 in their pricing lol

[@venomrogue1]

I think this is my problem, but not sure. I tagged you in my post on FB...if you dont mind putting in your 2 cents.. 2002 SATURN SC2 UPDATE: yes it was the nasty gummed up, sticky pindle on the EGR Valve. Cleaned up nicely, running like a champ. its the original EGR, the car has over 220k on it, but it cleaned up so nicely, i put it back on. Heres to another 100k!

[@darrinfaulkner8911]

Awesome video!I am cleaning my egr valve after Christmas and replacing my lower intake manifold gasket!Thank you again👍..

[@halcon255]

thanks chris..so informative to ordinary people like me who does DYI often.

[@TheHDStation]

So If I remove the EGR Valve, and it holds a vacuum, I should just clean out the carbon and use the same valve? If it doesn't hold a vacuum, then I should get a new one? Will cleaning it help it keep a vacuum? The mechanic said I needed a new EGR valve according to the computer, so I'm gonna try to clean/fix it myself. I'd rather clean it bc a new one is about $150!

[@chrisfix]

Correct. Cleaning will only help it slide open and closed. The vacuum is all about the condition of the diaphragm.

[@martystevens3969]

Sam Sloan The EGR should hold vacuum until you release the vacuum. EGR valves can stick open a little. Carbon can hold it open. Try a gas tank carb. cleaner to keep it clean. It also cleans the cylinders. If it leaks down replace it! Check the passage below the EGR valve if it's clogged.

[@jaxonwalston9766]

You could almost eat off of that engine. How do you keep it so clean?

[@Alteriukas]

By cleaning it lol

[@Sr_iRL]

Alter ahaha thanks Sherlock

[@theguyttissybob2362]

on one of his videos he shows you how to clean an engine

[@theguyttissybob2362]

+theguyttissy bob chrisfix how to super clean your engine

[@bossman6627]

Heavy duty degreaser works great.

[@taotakaoka4449]

love the video....clear, concise and to the point.....no extra verbalage....nice camara work also

[@tahustvedt]

Your channel is one of the best channels on KZbin.

[@scottfirman]

geesh,people giving thumbs down were just GM haters,dont need no negatively here anyways. they can go away. Truth is they learned something,just dont want to admit it.I always had to replace the vacuum line because the fitting and hose was always rotten from engine heat. seems like every older car I ever bought needed a new one too. didnt matter what brand car. they are mechanical and do wear out. you would think by now they would have invented something that didnt operate on a bellows,vacuum system. Thats so old school. I like your Vett myself. I was a Mustang guy. Problem is they suck driving in Northern MI weather. If I were to buy one now, it wouldnt see a snow flake. I love the old school cars better than the new shit they put out. At least back then there were less things to go wrong. I own a Subaru again,love those boxer engines. Reminds me of the old Volkswagens. I told the wife,if I stripped off the electronics,it would be the same engine our first Subaru had,less the electronic stuff. The basic design is still the same.

[@jonsonaugustin2398]

What is the name of the app on your phone

[@ronaldoperez6440]

Bluedriver

[@gkvetter548]

Great video Chris! My light was on , checked my codes, indicated egr( used paper clip method btw) car was running rough at idle, my egr failed so i replaced for less than $ 60 runs great and no light!!

[@swansong007]

Great video with clear and thorough instructions. That's one smart looking car. Looks new.

[@jocalibusohump]

Very informative

[@chrisfix]

Thanks!

[@CloroxBleach-fr9nf]

Where did you get your corvette

[@manmohanjammula9684]

can't we use brake cleaner to clean EGR valve

[@luiscolon8241]

jo calibuso

[@josebelmonte8297]

manomohan jammula and cr

[@wolvertonlecensura9541]

Hi Chris, it's 12-18-2019 right now, do you still have the C4 ?

[@chrisfix]

Yes

[@wolvertonlecensura9541]

@@chrisfix amazing car, hope you keep it

[@peteretzlaff5122]

Fantastic walk-through! Step by step, excellent. Now tomorrow morning I'll see if I can feel it out as easily as ya made it out. lol Thumbs up my friend

[@tdgarage4012]

Great video. I like how you explain everything in a simple way that's easy to follow.

[@chrisfix]

FensterTV Thanks! Glad the video was helpful!

[@thieflack7132]

When are you getting the crown vic back?

[@chrisfix]

Kevin Tinajero Should be soon because it needs brakes and I told him it was very dangerous to drive lol. Gotta convince him to give it back to me somehow right ;)

[@thieflack7132]

ChrisFix lol thats great cant wait :) !

[@HUBBABUBBADOOPYDOOP]

From Wikki: *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. This dilutes the O2 in the incoming air stream and provides gases inert to combustion to act as absorbents of combustion heat to reduce peak in-cylinder temperatures. NOx is produced in a narrow band of high cylinder temperatures and pressures.In a gasoline engine, this inert exhaust displaces the amount of combustible matter in the cylinder. In a diesel engine, the exhaust gas replaces some of the excess oxygen in the pre-combustion mixture.[1] Because NOx forms primarily when a mixture of nitrogen and oxygen is subjected to high temperature, the lower combustion chamber temperatures caused by EGR reduces the amount of NOx the combustion generates (though at some loss of engine efficiency).[2] Gasses re-introduced from EGR systems will also contain near equilibrium concentrations of NOx and CO; the small fraction initially within the combustion chamber inhibits the total net production of these and other pollutants when sampled on a time average. Most modern engines now require exhaust gas recirculation to meet emissions standards.*

[@arturocamacho9843]

I really like your vídeos, thanks for your good teaching, may God bless you! !

[@PotatoeChipz]

Nice testing tip without a vacuum pump. Just what I was looking for, thanks!

[@pieeyed9366]

By runs "better" I'm assuming you mean better for emissions, not performance?

[@chrisfix]

Pie Eyed Performance too. The computer was trying to use the a/f ratio for the normal flow of the egr and that was not working so it had to retard timing.

[@DENicholsAutoBravado]

Pie Eyed Maybe it's surprising but PCM's are generally designed to help an engine run better. So disable the EGR and expect slower lap times/poorer results on the Dyno.

[@pieeyed9366]

I drive a Hemi and the EGR valve aint enough 'Merica...unicorns don't equal horsepower so I took it off. *spits in a bucket*

[@DENicholsAutoBravado]

Pie Eyed lol

[@frosty98412]

Pie Eyed It's bad for performance for sure, just google "egr junk intake" and see for yourself. To avoid a/f ratio issues EGR should be "killed" in the ECU itself, ECU remapped and physically block the flow holes on the intake for the EGR valve. I've had it done on my car. Also when performing this it's good to take the intake off and clean the soot and carbon. Much better airflow

[@GTGallop]

How does hot exhaust gas cool the engine?

[@TheFringes.]

The exhaust may be hot, but it's still colder than the engine.

[@GTGallop]

So is outside air, why not bring in outside air - with oxygen in it.

[@TheFringes.]

+Greg Gallop They do, but it's not enough. Look through the comments, someone here said something fancy that explains it.

[@alank7833]

+Greg Gallop The EGR system re-inserts already burned gases into the intake system. Since those gases can not be burned again, it lowers the peak combustion temperature, therefore reducing the oxides of nitrogen level.

[@joeyppppppp2]

+Alan K well said ..

[@g41thomas]

Chris thank you for all you great videos.I really learn a lot from you. Can you please make a video about how to use timming light in order to time an engine? Thanks again

[@jamiephillips620]

Excellent video!!!! well explained, well articulated, great close up camera angles and well produced good job.

[@chrisfix]

+Jamie Phillips Thank you very much!

[@pagemartin5936]

Literally replaced my egr value four days ago 😬

[@jaydencatrell6688]

Page Mart EGR valves are very bad for your engine it makes it run hotter and decrees engine preformance and gas mileage

[@maxowndhard]

9:44 Correction : These nutts.

[@sizzlacalunji]

Remember my wife’s 2010 JDM Honda Fit She’s EGR triggered a CEL with about 8k km (5k miles) . Cleaned it and never had an issue with it since.

[@geraldweissburg8618]

A born teacher. Very clear and precise.