EGR/Air Shutoff Valve Cleaning | Mercedes M272 Engine E-Class W212
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- Опубліковано 22 лют 2021
- This video was preformed on a 2011 Mercedes W212 E300 with a M272 Engine.
The car started having rough idle but with no check engine light engine.
Checking with an OBD2 scanner I got a P0407 code.
P0407 is for exhaust gas recirculation sensor b circuit low.
After cleaning the EGR/Air Shutoff Valve in the video the rough idle was reduced a lot.
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I am not a certified or professional mechanic. This video is for entertainment purposes only. Zaki Garage assumes no liability for any actions performed by the viewer as a result of the information contained in this video - Авто та транспорт
Good job but it is not EGR, it is secondary air valve that passes clean air to the exhaust manifold (before catalyst to improve catalytic reaction when the engine is cold)
These valves are held together with small screws, if you take them apart, you can clean them much more effectively.
This is the exact video I was looking for. Thank you!
Thanks for video I think you took me to my problem, same motor.
Great work bro! Keep it up!
Appreciate it 🙏
Great work and Thank you~ From Seoul ^^
Awesome job. If it's your vehicle, I suggest that you clean parts while you are in there, awesome job otherwise!!
4:40 "I should call her"
Great video.
nice video ill clean mine too when i have holiday
great job
Thank you
The M272 engine is not equipped with an EGR system. What you just removed are the air injection valves for the bank 1 and 2. If you notice, they connect to the pump right in the middle/top of the engine. Lots of times generic P-codes will give you incorrect description of the codes.
Yea. I was a little puzzle that EGR system still exist in modern engines.
@@kito1san well the 272 is not that modern anymore, but it does not have EGR indeed.
maby p0172 &p0175??
@@Mexicanobandido420 I'm working on it next week, but since since you posted your question 11 months ago, please update us?
Do you know which one of the air injection valves is “bank 1” and “bank 2”? Thanks
Mom is going to be so pissed when she sees what you did to her coffee table. 🤣
Which one is considered bank 1 and bank 2? Thanks
What issues does this cause when dirty?
What is the size of the vacuum hose you replaced? Where did you get it from?
Thanks in advance!
Sorry it's been years since I bought that hose that its no longer listed on amazon so I couldn't look up its size.
It's channels like this getting me to dominance over my $500 2006 C230 with 120k miles. Some bad engineering on this W272 motor man. Looks like intake manifold next. Stupid hahaha but maybe I can hack it with some kits, cleaning etc who knows. Replaced the oil separator that leaked oil into the intake and screws up the flaps yest. Mass air sensor, cam magnets, cam position sensors. At least theres 30 vids on the garbage intake manifold
Why do Mercedes engines get so much of that dirt that looks like dried mud on it. Even with the splash guards. How is it possible? Because mine isn't oil it like mud
Good🎉
Very good video, thanks. But do you change something in the motor way?
Thx, but what do you mean by "motor way"?
@@ZakiGarage Some hoses or the connection points on the engine? You only changed this short vacuum hose, do you have the article number? I have the same error code P0407 but no engine light, did it help you? Do you notice something on the engine or while driving with this error code? What is the name of the fluid that you you?
@@l.c.972 That was the only vacuum hose I changed since it was the only bad one I saw. There are so many vacuum hoses around the engine and any broken one of them could cause rough idle. I don't have an article number for the hose, I bought it long time ago from amazon and I just cut it to the right length, should be similar to this amzn.to/3162UJq.
Yeah I had the same P0407 and no engine light, the video did reduce the rough idle a lot but I think I did not leave the EGR soaking in the cleaner long enough. I might do it again and leave the EGR in the soaking for a few hours this time and clean the throttle body too . The cleaner fluid was carbonator cleaner like this one amzn.to/3c1bI9N or any other brand works. The fluid inside the hose was silicon spray, its not necessary but it made it easier to slide on like this one amzn.to/3slto61.
@@ZakiGarage when you check again with a OBD scanner, do you have the same P0407 or is it deleted now after the video? thank you very much for your support and time 👍🏼😎
@@l.c.972 I cleared all the codes after the video and never check since
Aren't those AIP check valves?...jc
Now whats the problem of the car...?
Aftrer cleaning the valves ,what progress gain this vehicle...Kindly please replay & thanks in Advance
The problem I had with the valves getting stuck from all the carbon buildup. It was causing rough idle and sometimes engine codes ( P1075, P0172, P0407, P0746, P0750).
Question... do I clean the hole with cleaner as well? I removed mine and it looked really dirty in there.
Mine was dirty too. I believe its the inside of the exhaust system, no point of cleaning it. But do recommend opening the valve it self(3 screws). Helps a lot with the cleaning.
@@ZakiGarage Thank you so much for responding...
Does this has to be Carburetor cleaner? Can brake cleaner be used?
I really don't know which cleaner is more effective. All I know is carburetor cleaner is used to clean carbon buildups like the ones in intake manifolds.
hi what is the size of the vaccum hose for valve?
3.5mm but 3 works more common
I have a 2006 E350 and the idle is very ruff it feels like when it has a bad coil pack, also check engine light is on, codes p300, 301, 302, 303, I replaced the spark plugs camshaft sensors cam adjuster magnets, crankshaft sensor, check the 305 degree with the stamp alignment all good, swap coil packs (no change) the acceleration is poor, the secondary air pump sounds like a jet engine when comes on. could the air valve failed?? any thought what could be the issue???
One clue you have is all the misfires are on bank 1 (Cylinders 1, 2, 3). So, I would guess the issue is with a component that controls all of bank 1 separately than bank 2 and not at an individual cylinder level issue. One relatively easy thing to check is to see if the air shutoff valve on bank one is working by apply vacuum to it and see if it opens and closes. Another is checking all the vacuum lines controlling the air shutoff valves, I've only replaced one of them in the video but had to replace the rest later on. There are many other stuff to check for such an issue (O2 sensors, intake manifold, blocked catalytic converter just to name a few)
@@ZakiGarage it could be the intake manifold itself. broken internal flaps will cause these cars to have very poor accelaration.
@@christiananderson1161 Yes, the intake manifold is a very common failure on this engine. Will case all sorts of codes and rough engine operation. The intake manifold on my car was replaced twice in the past.
Why did you clean the parts? Did you have any trouble with the engine or what did you clean them for? Thanks!
I mentioned it in the beginning of the video the car had some rough idle with P0407 engine code but no check engine light.
Did it cure rough idle after cleaning them?
please help, engine constantly revs while in park and can feel it wanting to rev while in drive
Could be many issues, check for the engine codes for hints.and I would give the MAF and throttle body a clean to begin with
@@ZakiGarage i changed MAF and cleaned throttle body already
These issues are not easy to find, I would use a scan tool to better try to understand where is the issue is coming from
@@ZakiGarage i am getting secondary air codes, lean codes also
Hello. I have a slight rough idle on my 2011 C300. I've replaced Secondary valves, secondary pump, new spark plugs and Ignition Coils, engine and transmission mounts and still have the rough idle in park and stop light. It goes away when I put in neutral. Any advice? Vacuum hoses look good. I also replaced 4 o2 sensors. I'm lost! ThNks
Oh my, you've changed a lot of stuff. Unfortunately, I'm not aware of a proper way of diagnosing this issue other than replacing parts and hopping it fixes the issue like you've been doing (plus, i'm not an expert). With that said, I would first make sure the throttle body is clean and try putting on a new MAF sensor, I've had bad MAFs cause rough idle in the past. If these don't fix it, I'll start looking at the intake manifold and injectors.
@@ZakiGarage thanks for responding. I forgot to mention I did MAF and cleaned the throttle body. Maybe the injectors...but if I put in neutral.....idling stops. I don't know what is isolated when car is in neutral. Thank u again
@@stephenheichelbech9316 Well, there is more load on the engine when it's in drive compared to neutral. But these engines always have issues with the intake manifold. The intake manifold was replaced two times on my car, but never had issues with injectors before. Also, another viewer comment mentioned that his oil separators was causing vacuum issues and rough idle.
@@ZakiGarage Thank you very much
Did you found the issue? Are u using premium gas?
I have a 06 CLK 350 and I was wondering. When you disconnect a sensor does it automatically go back to normal once reconnected? And do you disconnect the battery for working with sensors?
I didn't disconnect the battery and had no issues. Just don't turn on the car with the sensor disconnected.
@@ZakiGarage okay I thought so, it's just I have never worked on a car other than a 66 mustang and my father always told me you disconnect the battery before working on certain parts, TYSM tho
I don't think it's a bad idea to disconnect the battery. But Even if you get an engine code coz of a sensor, I would make sure the sensor is plugged in and do an obd scanner fault reset if the engine code didn't go away by itself. I have forgotten to plug some sensors back after long fixes and it's not a big deal.
👌🙏
So it has 2 EGR Valves?
Good question and I'm really not sure. I'm seeing conflicting info out there:
-There is a doc online that says the M272 doesn't have an EGR valve.
-MB repair manual refers to the part as Air Shutoff Valve.
-The OBD code was for a fault in the EGR.
-A MB mechanic told me that the part I took off is the EGR valve.
In my opinion it seems to be taking air from the exhaust and controls how much of it goes back to the intake through a valve, so it acts like an EGR it must be an EGR?? I could be wrong 🤷♂️.
But to answer your question, the MB mechanic told me there are only these 2 EGR valves and the repair manual only shows these 2 Air Shutoff Valves for this engine.
@@ZakiGarage could it be that it does the opposite? Take air from the intake to the exhaust? I thinl that's why there is that pump, although I don't know why taking fresh air to the exhaust can be usefull (I think I heard something about the O2 sensors but not sure if it's related)
Yeah you could be right. If so, I assume to help with emissions and would effect the readings of the O2 sensor
@@ZakiGarage i don't think that's an EGR. Those valves are for the second air injection. Basically they are one way valves, when you start the engine, the secondary air pump switches on, to help with the emissions until the engine warms up a bit. These valves let the air in. And obviously they are in pair since this is a V6 so it has 2 banks.
@@ZakiGarage have you changed wheel hubs?
My car don't pick up oiled someiimes
40+ hp
What was the sysmptoms?
Sometimes its rough idle, sometimes with engine codes ( P1075, P0172, P0407, P0746, P0750). I usually get this issue once a year and cleaning the Air Shutoff Valves usually fixes it. Just got the issue again this week and had to clean them again.
@@ZakiGarage can i use carb cleaner since I don’t see AcDelco in the store and spray to these?
Any brand carb cleaner should work, just leave it socking in the part long enough. I did run out of carb cleaner one time and cleaned it with brake clean but it didn't clean it well, a month later I had to clean it again with carb cleaner.
@@ZakiGarage thank you
@@ZakiGarage how's the state of your intake manifold? All the known weak points in the pcv/ccv system?
I would hope after you cleaned these that they wouldn't give you trouble again for some time.
I have a rough idle on cold starts & having addressed nearly everything on my m272, these air check valves & a few hoses are all I have left really.
Seeing how disgusting my manifold was (thanks previous owner), I suspect these valves are totally clogged. Had an extremely rough idle before doing the manifold. Reduced after replacement, but still there. Thanks for the vid!!
Maybe clean up the engine bay a lil
thats the dirtiest m272 iv seen
Not EGR! Clean that engine would ya