Sorry, none of your tips prevent "valve gunk" on direct injection engines. The cause is completely attributed to the lack of "valve wash" from port injection, as you stated, and the PCV (Positive Crankcase Ventilation) system. The PCV system takes all the vapours created in the engine, blow by etc, and sucks them into the intake manifold (after the throttle valve). These vapours contain several components but basically are combustion gases and oils vapours. Without the "valve wash" that port injection provides, the vapour deposits are what "gum" up the intake valves. There is no service or maintenance scheme that can prevent the build up. In fact many times there is not even a way to reverse the affects without a major engine disassembly or head replacement. Only a "catch can" will reduce or eliminate the build up. A catch can or Air/oil separator, intercept the vapours and condense the oil from the vapours before they enter the intake manifold. Again sorry, your wrong and there is only one solution. Yes good maintenance will ensure a good running engine which ideally produces less blow by etc, but really maintenance is not the solution for DI engines. Factory installed PCV catch cans are. (or aftermarket for the cars that don't have them)

@honestycounts9352

7 жыл бұрын

EXCELLENT information !!! Thanks. But on my car I simply disconnected the PCV hose from the air intake, added a plug onto the hole left open on the air intake (to prevent a vacuum leak), and let the PCV hose dangle, allowing the oil vapors to escape out into the atmosphere. Then once a year when I need to get my emissions test done I put everything back to the way it was temporarily just for the test, then disconnect the PCV hose once again. That's what they used to do on the cars from the 50's before emissions systems/hoses were added to cars. The oil vapors from the crankcase just went out into the air.

@RobertKohut

7 жыл бұрын

Ya that works, just venting to atmosphere. There are "decorative" and functional filters that you can adapt to the valve cover for a better look, prevent junk going up the hose (if that's possible) and may be less messy. Some cars may be affected by the loss of unmetered air though, not really sure on that one though.

@danieltubbs5422

6 жыл бұрын

I run catch cans on everything and I try to make sure I hit operating temp, seems to do the trick

6 жыл бұрын

Robert Kohut nailed it. Thought I was the only one cringing and raising a brow at what this guy was saying.

@charlesphillips5723

5 жыл бұрын

If your vehicle has an inter cooler It acts like a catch can. but it has no way to dispose of the blow by gunk. I drilled a small hole (1/8") in the high pressure side (after the air passes through it) This will let the gunk drain AND I spray intake cleaner through this hole while the engine is at high idle. That cleans the valves and does not affect any of the sensors in the intake system. I empty the entire can in small bursts so far it has done a very good job. My plugs last longer and I no longer get misfire codes.

All three suggestions, which are good maintenance practice anyways, will have almost no effect at the problem at hand. An oil catch can, more specifically a passenger side catch can will filter out any oil being fed back into the intake to be burned off and significantly help in keeping those valves clean.

@rds990

3 жыл бұрын

Nonsense. Sorry but it is.

you forgot to mention to use a high-grade full synthetic motor oil which doesn't leave as much gunk behind as do conventional oils.

Low volatility / NOACK oil (check for MB 229.5 spec if you can't readily find NOACK numbers as that's

EGR (exhaust gas recirculation) and PCV (positive crankcase ventilation) systems depend on the vacuum pressure generated by the intake manifold thus drain all their contents into the intake manifold which touches the intake valves anyway. If poorly burnt gasoline and carbon soot from the EGR get recirculated back into the intake manifold along with the blow-by air-fuel mixture and aerosolized engine oil droplets from the PCV system via vacuum hoses then it will not matter what gasoline or engine maintenance you do. The intake valves will foul regardless due to the EGR and PCV system recycling exhaust gases and crankcase pressure into the intake manifold. An oil catch can installed inline into the PCV system will help collect aerosolized oil droplets from the crankcase mitigating intake valve carbon build-up but not eliminate it entirely. Although illegal, venting the EGR directly to atmosphere will help protect your intake valves from fouling. Best advice is to forsake new GDI (gasoline direct injection) engines completely and purchase engines with dual systems that have both port fuel injection and direct fuel injection or just go for port fuel injection systems period. Old technology, although outdated, is still functional in the 21st century. Newer is not always better.

An oil catch can will really help slow down build up on the intake valves.

@Petrezen1982

6 жыл бұрын

Not rly. It helps ONLY on engines with not so tight cylinder bearings allowing blow by effect. On tight bearings or well maintained engines it's useless. I know because I've spent money on one and installed in my own car with direct injection and after 1 year of hard driving sometimes above 240km/h there was not a single oil drop inside. It was perfect clean. FA20 Engine 5W20 MOTUL oil. 45K km

@AnthonyJ350

6 жыл бұрын

Petrezen1982 Was your can baffled? There was no moisture or anything? Watch this video (it is a high performance vehicle and port injection) look how much moisture he pulls out. kzread.info/dash/bejne/eomF0NptYMfKiJs.html

@AnthonyJ350

6 жыл бұрын

Petrezen1982 You mean piston rings right?

@GdaySport

6 жыл бұрын

@ AnthonyJ350 I agree - but cheap eBay ones are useless. A baffled or filtered type one definitely helps. Blocking the EGR helps just as much again, and is very cheap. Both those will help prevent it getting worse, but if it's already gunky, not going to get rid of it. The only way to reverse the gunk build up is water methanol injection (you can run just distilled water) which will steam the build up off the valves and some of the inlet too. Those are my 3 tips and will work a bunch better than changing oil, plugs, and air filter!

@swing2gether

6 жыл бұрын

I've seen more catch cans being used on turbo charged vehicles like my f150 with the eco boost.

Every answer for direct injection, requires the owner to buy something, or pay someone to fix it. Wonderful technology

The best fix to gdi issues is trade it in for a car with dual injection.

@rockkstah2550

2 жыл бұрын

😂 true dat!

@FirstMomentsOf

2 жыл бұрын

Just install an oil catch-can

@aciddiver1978

Жыл бұрын

Im afraid i agree this.

@ivanperez707

11 ай бұрын

Yeah and then go back to carburators and then trade it for one horse , seems like you like 1806 transportation

@EagleEye8208

8 ай бұрын

Don't agree using a top tier gas, high octane gas used in standard run of the mill engines has shown to have poor fuel economy and higher emissions due to the lower internal compression. Install an oil catch can and perform a front and back induction service twice a year should keep things in check. For the rest of your fuel system fuel additives every oil change should be keep your injectors and upper cylinder nice and clean.

This guy does a very good job explaining the unmentionable problem of GDI engines.

STP valve cleaner works amazing. It is a 9 minute spray that you into your valves and I actually took before and after pictures and it worked very well the first time. I also installed an Oil catch separator that I empty every time I do an oil change and that removes a lot of harmful oil residue that creates valve gunk. These maintance tips are absolutely necessary for the new cars with GDI and they do work.

I drive a gdi 1.6 Kia soul. Been burning oil like a mofo. Do you think this is Why? Never had the intake valves cleaned. 130000 miles. Changed pvc valve and have used mmo in gas and engine. Changed the plugs and coils. Any suggestions? I use 89 bc 87 always sets off the knock sensor.

Using a RX catch can and clean side separator since new on my 17 Silverado High Country 6.2L and it calls for premium fuel anyway and you wouldn't believe the gunk that can catches so worth the investment on any direct injection and it doesn't void the warranty.

@rds990

3 жыл бұрын

And you have clean valves now ?? Are you sure ??

At a time in history when the combustion engine is almost ready for life support (EV's, Hydrogen, etc . . .), direct injection is going to set it back decades in terms of reliability in the mind of consumers and pave the way for the shift away from the combustion engine. We have reached the point where emission requirements have taken priority over longevity and reliability, both of which peaked over a decade ago.

@RR-ev3po

5 жыл бұрын

how sad is this truth

@asherdie

4 жыл бұрын

EVs suck.

@KF1

3 жыл бұрын

Screw it, I'm buying an old Corolla hatchback. I don't want anything to do with gdi.

@bioshockzoa

3 жыл бұрын

You forgot that consumer buy what they want ;) And actually they dont want 800kg of lithium in a car that won't last 10 years. So your prothetic shit is incorrect

@KF1

3 жыл бұрын

@@bioshockzoa who are you even talking to?

What do you think about an oil catch can set up on the PCV valve ?

Clean and fresh plugs and top tier gas, please explain how these "indirectly" help valve gunk? I can see a quality motor oil, that may limit oil mist going into the ERG valve, would help keep what does make its way to the backside of the intake valve would help.

@johnsampson9961

2 жыл бұрын

I'm not a mechanic, but I can attest to what is said. I thinks it's in relation to knock. They also recommend drilling out the PCV to make the hole a tad bigger as well.

What do you think about catch cans. It turned out my car has a catch can originally from the manufacturer

One thing I've came to realize that most auto manufacturers do delay the exhaust timing on the exhaust stroke on vvt engines to act as an EGR system so that's a double whammy because the exhaust gas is coming back into the intake just slightly

-Top Grade Fuel -Oil Catch Can -Water Methanol Injection -Go wide open throttle twice a day (on ramps are perfect for this)

what is the use of saving fuel if the end result costs you more to maintain than the fuel would ever have cost?

@Taydrum

6 жыл бұрын

It creates more power and burns cleaner, but yeah major flaws to be fixed with new GDI technology

@billryland6199

6 жыл бұрын

The liberals don't care about how much we have to pay to maintain our cars.

@josepheaton3779

5 жыл бұрын

Keeps Progressive liberals happy.

@jdenino6022

4 жыл бұрын

Bill Ryland Liberals Suck.

Toyota is now using dual injection. It has direct injection for the main fuel and retains the intake runner injection also.. blends the two for best if both.

@slomango7927

6 жыл бұрын

kens97sto171 so is ford

@JaimeNavidad

6 жыл бұрын

Which models? This sounds like a good idea. the fuel cleans up the intake valves

@alb12345672

6 жыл бұрын

MY GS350 has it. Very good idea.

@fatboy19831

6 жыл бұрын

My BRZ has it ( same as Toyota 86)

@panagiotisf7228

6 жыл бұрын

more issues nd injector to fail meaning more cels

Why can't you vent the gases to the outside air to prevent this? I know it is not allowed because of emissions, but is it possible?

Late to the party but I just got a v6 Caddy and I'm learning about all this stuff. Port injection keeps valves clean by spraying crud off the valve with fuel, but where does that crud go? Directly into the combustion chamber. Seems to me like DI would keep that crud in the valve port since you're not spraying it off into the chamber. I think taking the intake apart every once in awhile for a cleaning is a lot better that replacing piston rings. Then again, it sounds like the PCV system plays a large part in gunk build-up.

I don't think this applies to the current Ford 5.0 engine since it has both standard location injectors AND direct injection. Would that be correct?

@mirceamunteanu4791

3 жыл бұрын

hard to tell as Ford does brag about it in their specs, some have both, if your car is new, you maybe lucky, ask your mechanic "how many injectors does my car has ?" . If double the number of cylinders your in luck :)

I agree with the plugs especially for the 100K plus replacement intervals. I have 2 Ford vehicles with the EcoBoost DI V6. I changed one set around 12K....new plugs as part of a tune. Looking good still with around 30K on the current set. Changed the other vehicles set the other day at just under 72K. Very pronounced carbon buildup. My other reason for changing more often is to reduce the risk of a plug getting seized in the spark plug well at 100K. Plugs air filter and if accessible fuel filter are three fairly easy and not too overly expensive preventative maintenance items. For the most part they are also fairly easy to complete yourself without paying dealer mark up.

Using extremely clean synthetic oil could help.. Pennzoil Ultra Platinium is made with natural gas which makes it a lot cleaner than other synthetics..

That gunk as you call it is blow by from the crankcase, those oil vapors go back to the intake manifold, a catch can will work but needs a one way valve, too much vacuum in the oil pan can reduce oil on cylinder walls, which will cause rings to wear out, and you wont know until a teardown.

Great Video, i have a 2009 Odyssey v6 3.5l with 200 kilometres! I just replaced my spark plugs, timing belt, and water pump at 160k and they were cleaner and looked great!. I was going to look into a 2018-2019 Oddy for replacement but it has those terrible DI as mentioned as Earth Dreams DI engine. I think I will keep driving this until it dies! my mechanic said see you at 400k then!

I'm surprised he didn't mention a catch can between the crankcase vent and the instake manifold.

The EGR makes it dirty the EGR system make sure your EGR is clean maybe there should be a some kind of a filter on the EGR

Some is caused by crank case oil vapor return into cylinders. Put a catch can and filter in that line .

What dose oil haft to do with valve gunck? Where dose this gunck come from

Does the Honda Civic type r 2015-16 is the same princip???

What about the little bit of oil on the valve that get past the valve stem seals? No premium fuel, spark plug change or oil will help clean your valves...

Following your maintenance from the booklet won’t stop build up also. With turbo application different oil weight sometimes better than recommended. Since recommended is for fuel economy not engine protection.

There is NOTHING you can do to prevent carbon build up with DI. The build up comes from reversion of the combustion gasses combined with PCV. You can slow it down but not prevent it. That is why a lot of cars are coming out with both DI and Multiport FI.

@231mac

5 жыл бұрын

Catch can....

@RR-ev3po

5 жыл бұрын

@@231mac who can install a catch can on my Mazda6 Skyactive 2.5L DI engine? Will avoid warranty? Please let me know before valves are gunked

@231mac

5 жыл бұрын

@@RR-ev3po The install with most Cath cans is very simple and there are plenty of install videos on KZread. I've never heard of a catch can voiding a warranty, unless the owner never emptied it and caused engine damage.

Your best way to prevent gunk on the intake valves is synthetic oil. It requires a higher temperature before it starts to coke. All valves in a internal combustion engine have some oil leak down from the valve stem which moves to the the actual valve seat area. A synthetic oil will resist coking from the high heat of combustion, where a regular oil will coke at a lesser heat producing more gunk on the intake valve near the opening causing restriction of air to the engine making it run like crap. Oil can also get into the intake plenum through PVC systems and settling towards the back engine cylinders intake valves producing deposits on those cylinders.

@rds990

3 жыл бұрын

YEP....Oil causes the issue. Good oil helps mitigate the issue. Gimmicks like catch cans etc have more drawbacks than benefits. If your catch-can is not perfectly sealed, you'll have bigger problems than dirty valves. The PCV system is calibrated to run at vacuum. Better keep that vacuum in place with that catch can.

I hear a lot of discussions about the relative merits of 'catch cans'. My question is, if they are so effective, why aren't they routinely used by the manufacturers? I don't know whether they work or not ... I'm just asking the question.

@silvertbird1

2 жыл бұрын

I wondered that as well, and after reading many posts on different forums for my vehicle, the consensus seems to be that manufactures know any problems related to buildup will arise well after the car is out of warranty, so they don’t want to spend the money to fit cars with them from the factory. But I don’t know if that’s accurate. I’m thinking of installing one on my 2020 Mustang Ecoboost but don’t want to void my warranty.

Do you recommend some sort of catch can to trap oil and water vapours from the crankcase ventilation system before it's recirculated back to the intake? Or are these mostly for turbo engines?

@justinpritchard195

7 жыл бұрын

Do your homework. They seem to work, but not sure if they're needed or not. Depends on the application. Recommend checking owner forums for the specific model you're after. If it was my car, I would add one.

@denisleblanc4506

7 жыл бұрын

Congrats on being one of the first if not the first car reviewer to tackle this "dirty secret" pun intended. Toyota was one of the first to recognize the problem and are preventing it with their newest engines. I see Ford has started copying Toyota. Funny that none of them offer catch can kits for their problem engines. I didn't expect it from VW given their recent history but from Ford I was hopeful.

@BB-nn9en

6 жыл бұрын

Ford's newer DI engines do dump some fuel on the valves to help keep them clean. I think a few VW engines are now doing the same.

@davidkovalski1531

6 жыл бұрын

Which engines, The eco boost ones?

@stephenwgreen78

6 жыл бұрын

Totally agree. Only thing touching valves should be clean air...& pcv system allows those oil vapors / blow by back in to what should be clean. I'm not sure where egr comes back in, but have never seen anything but disabling that:)

Catch Cans can help reduce oil and water vapor form mixing with the stuff from the EGR system in the intake system use two catch cans in series and use 10w 30 motor oil will help to.

The only way these tips reduce the amount of gunk build up is by reducing the likelihood and amount of ring blow by, an increase in blow by increases the oil vapours that come out of the crankcase and deposit on the valves. The only real way to prevent gunk buildup is to fit an oil catch can even on a non turbo or diesel engine . Some cars have factory catch cans but they are usually of limited help.

Struggling to comprehend how spark plugs, oil changes, and air filter changes serve to delay the build up of crud on your intake valves? Let me shed some light: 1.). Old, worn, mis-gapped, and carbon coated sparkplugs like to misfire when intake manifold vacuum is low, as it is when accelerating. Misfiring plugs allow unburned fuel to wash the cylinder walls, and contaminate the lubricating oil. Fuel contaminated oil quickly loses its viscosity, allowing it become more easily entrained in the crankcase blow by gasses that are directed to the intake system via the Positive Crankcase Ventilation system. RESULT: WORN PLUGS CONTRIBUTE TO VALVE GUNK BUILD-UP. 2.). Infrequent oil changes allow the oil's viscosity to thin, as the polymer additives that are intended to provide "multi-viscosity" properties, break down with age. The "thinning of the oil" allows a greater amount of it to be swept through the PCV system, in a similar way as described with worn sparkplugs above. RESULT:. OLD, THIN OIL ALLOWS INCREASED AMOUNTS OF IT TO BE DIRECTED AT INTAKE VALVES, WHERE IT COLLECTS AS CRUD. 3.). Infrequent air filter changes allow intake manifold vacuum to climb as the filters become clogged. In turn, high manifold vacuum entices crankcase gasses to flow past the clearances between the valve stems and valve guides, and onto the back sides of the valves, causing increased build-up. A poorly maintained vehicle often leads to the combination of overlooked sparkplug changes and oil changes, in addition to overdue air filter changes. Thus, an exacerbated effect occurs when high manifold vacuum acts upon the reduced viscosity oil, thereby undermining the effectiveness of the valve guide seals. RESULT: INCREASED ACCUMULATION OF VALVE GUNK BUILD-UP

Thanks for the Video. It really help new driver like me.

Great information. Thank you!

Fantastic and eloquent video!

Great info/video, thanks!!

What do spark plugs have to do with the backs of the valves? Also,check the air in the spare!

@ronfazer2423

4 жыл бұрын

Good point. And Spark plugs last 100K these days , I am not going to change them early when I could "just check the air in the spare" HA HA. I use a full synthetic oil that has a low volatility percentage , it is called NOACK percentage. Some people mention a Catch-can but then someone has to remember to empty it.

Both my GDI cars generally see a service every three months because my other half and I live a distance from our workplaces so both cars do some considerable commuting. As yet, not real issues with either car and the kilometres are getting up there...One car at 160K...the other at nearly 90K...

Is there an aftermarket product that would allow an owner to flip a switch and clean the valves once a month ?

change your pcv, and as I have seen many european cars (BMW/mini) actually use walnut shell and sandblast it out on closed intake valves.) I am going to check on my 2013 mazda cx-5 it's at 74000k now. I have a borescope at work.. ill take a picture if I can. going to try the seafoam tretment if it's bad.

Great information on maintaining a clean direct injection engine 🙌

Main cause is using an oil with a low flash point. What builds up on the valves is oil fumes not oil itself. A catch can is a band aid solution to the problem. Some brands don't have a lot of issues such as DI Chevy engines because they induce a swirl which has proven to keep the intake valves cleaner NOT clean. BMW 335 drivers found out back in 2010 that using a high flash point oil reduced almost completely valve oil fume buildup..I hate being a beta tester for the car industry!

@gester27

5 жыл бұрын

What oil would you recommend? Motul or amsoil?

@cupramir

2 жыл бұрын

@@gester27 Amsoil or Pennzoil Ultra Platinum

Use seafoam aerosol once a year, that's what I do. Plus if you have a flex fuel run the higher ethenal blended fuels, they burn cleaner than regular gas so the gunk won't build up as quick or at all.

Why we still have the intake valves when we have direct injectors???

Throw more money at the problem! Amazing advice.

What is or who sells top tier ? I live in Las Vegas, I use Costco but is that top tier ?

Solution: Buy a Toyota because they use both port and DI Or.... get and EV

Ok What about top of the pistons in the combustion chamber that's full of carbon ??🤔 just curious

No information to help remove the buildup or stop it from forming. The information in this video only helps by not making a bad situation worse.

@ony3179

5 жыл бұрын

But the subject is about prevention, plus this the most logical advice I've seen especially for brand new cars.

very good advice especially the oil change interval it should be shorter than the owner s manual ( I would say around 3 000 miles) this would be that the oil will contain less soot when passing through the pcv system because it is the pcv system that recirculates the oil vapors of the crankcase onto the intake valves... less dirty vapors les accumulation my 2 cents...

Forth tip: leave your vehicle with direct injected engine parked in your driveway permanently to prevent gunk buildup.

@JetSkiBuyFixPlaySellChannel

6 жыл бұрын

Better yet don't buy a car withdirect injection.

@DKSE123

18 күн бұрын

Or buy an older vehicle with a trouble free sefi port system

Best way to reduce valve deposits: 1. Run quality Syn oil at reasonable oil change intervals 2. Oil catch can 3. Combustion chamber cleaner used occasionally 4. Engine oil flush used occasionally 5. Use valve cleaner spray occasionally or walnut blasting.

I have a catch can on both my new vehicles and only use a top tier fuel

Maintenance should be done for every car. Top Tier Fuel will help with the injectors andding a catch can will help but not cure the problem. I have a Lincoln MKS Eco-boost sedan. I have a catch can installed. If you have a Ford Eco-boost in a sedan or truck install of a catch can is very simple to do and you don't need the most expensive one you can buy. Mine was $30 on Amazon with the features I wanted. A bottom drain valve etc. Don't use the breather that comes with it. They reduce vacuum and can mess up your smog check.

As you can see by the other comments none of the suggestions u mentioned would keep a DI engine intake valves or head clean, They are good things to do to a car but not tho keep the intake clean

None of this will help if it does not touch the valves

@shakke52

4 жыл бұрын

But it will prevent them happening earlier

Doesn't mention catch-cans.

@ravenh9843

5 жыл бұрын

@Porky WithAPistol They do not void your warranty

@ravenh9843

5 жыл бұрын

@Porky WithAPistol Well that was your first mistake, buying a KIA or Hyundai. I bought an F150, added a catch can. Ford sells them on their website. Got 2k miles in with the can and it already had some in it.

@jonlucas5521

4 жыл бұрын

@@CedroCron I do both.

@pauljohnson7468

4 жыл бұрын

Steve Cedrone I own a 2018 Accord 2.0 with GDI....would you prioritize the cleaner over the catch can....or both???

What about using a higher octane than recommended?

@Private011

Жыл бұрын

No. Higher octane does not increase detergent content. All levels of fuel will have the same additives from the seller. i.e. Exxon ads their additives to their fuel. Octane is simply for high compression, forced induction, turbocharged and super charged engines as it burns cooler in the chamber, thus not causing detonation damage.

What if you buy a used car can you still go buy owners manual

@ 1:38, man you almost gave me a heart attack. I almost thought the "can" was intake cleaner. I'm thinking, man how can he put up with the smell and talk lol...😅 😅 😅

Great Educational Video! Saved for my library! ;)

new hondas dont come with a factory maintenance schedule anymore. they come with a maintenance minder light and they tell you to follow that light and oil life % monitor.

Well explained.

Have you heard of routine intake cleaning? that's all you need... once a year or every 6 months if you drive really hard or do a lot of short trips. Catch cans don't work most of the time, that's why they do not come installed from factory.

he don't have clue cleaner added to direct injection engine to clean inlet valves ?

Does The USA get inferior gasoline in some brands or grades? never heard of this in OZ.

Next he will be suggesting to inflate the tyres to correct pressure.

Another great explanation more for f150 you're honest and have the gift to explain the hard please Don't stop

@donaldellingson4696

3 жыл бұрын

Don't belittle tire press. That.cost ford& Fstone m.M&. Deaths

Plug shown at 2:38 has a broken ground. That motor is came from must have suffered from some catastrophic failure.

My 2020 Colorado has a direct injection v6.

Egr is the problem. U take exaust and put it back in. then the crank case vent goes in the intake to have hot oil stick to the valve. The fix is get rid of the egr then vent crank case in a vent can.

None of those suggestions will make a bit of difference what will work is an oil catch can and for boosted applications i.e.: turbo or supercharged, a dual oil catch can is a must.

@unprofessionalmechanic8466

5 жыл бұрын

I have a 2013 range rover sport supercharged, dealer just put in brand new engine and I still have 1 more year warranty, once that expires I was planning on adding an oil catch can, since I can't alter anything before that, but what do you mean dual? 2 in series or parallel?

@231mac

5 жыл бұрын

@@unprofessionalmechanic8466 He means one for the 'clean' side and one for the 'dirty' side. And I would at least put on on the 'dirty' side now.

Forgot to mention an oil catch can to help prevent deposits.

Get rid of EGR and install a catch can is what you need to prevent valve gunk in a GDI engine.

Hey this is great advice for the 1990s. I don't think car dealers distribute maintenance schedules anymore. I have scoured the internet for a maintenance schedule for my Honda Accord and come up empty-handed. Everything just says do what the onboard computer tells you to do. And I doubt very much that it's going to tell you to change your plugs or get your injectors cleaned. I did find an online manual for my 2019 Honda Accord it is 500 pages long and has nothing in it about a maintenance schedule. A manual that is 500 pages long is basically about as good as no manual at all. This is all about just teaching you how to use a computer. It's more like the five volumes of operating instructions I got on my old Windows operating system in the early 1990s then a practical, serious guide to using these damn new cars and their stupid encrusted valves and their accompanying oil dilution problems which aren't even mentioned here.

You can get a mechanic to clean it or you can get a can of carburetor cleaner and fog it old school. Cleans everything downstream from the throttle plate. It can also clean and fix a stuck open EGR valve. Spray for a minute, let it soak for 10 minutes. Repeat 2 times. Fog.

well done

Seafoam, CVC , these are 2 top valve cleaners that can be done approx 25000 miles and are $20 or so , I use them and recomend them, look them up on KZread, odds are you can find a video on KZread for your vehicle

CRC Valve Cleaner is the solution but don't follow instructions on can. 2017 Sonata new got 32mpg combined. At 25K now gets 26mpg combined. After cleaning, returned to 32mpg and sets you back into the seat @ WOT, so it works. Bring car to operating temp., spray intake (down flow from any MAF) with full spray at 2500rpm. Engine will choke down and almost die, turn off at this point. Let heat soak for 1 hour. Start and drive for a couple miles and repeat twice (3 times total). Engine will crank longer before starting and will rattle and ping first mile of first cleaning. This method only uses 1/3 can for all three heat soaks. The initial pinging proves that carbon was breaking away after each heat soak. No codes set and 5K mile later (30K). Blow-by from crankcase increases with each acceleration and that is why highway use delays carbon buildup. I am a lead foot with WOT used frequently. I will do one heat soak every oil change from now on. GDI problem handled.

@edubb2491

4 жыл бұрын

Bro..can u do a vid on this?

What u really need to do is start early on using CRC GDI valve cleaner alone with BG FUEL additive.the valves r already gunked up bye 10,000 miles really bad,I'm a KIA tech and see it all the time because most of the engines r GDI .and by 30,000 miles you'll problem need a manual cleaning of the valves bye removing the intake,thats if u want good performance and idle like the vehicle was new.

@tommasopetrella4856

5 жыл бұрын

I think a lot of this is over worrying. Yes, GDI is a bad design, but not all cars will suffer as bad as others. I believe it is in the tolerances and this varies from car to car even from the same engines and make. My Ford Focus has 70,000 miles on it and i didn't do anything different than any other car I had previously. Hardly changed the oil on time. It still runs as well as the day I bought it and its fuel mileage is the same too.

Why hasnt anyone mentioned walnut blasting as a solution to build up

@benjaminwayneb

6 жыл бұрын

You would need to remove the intake manifold to access the back of the intake valves.

@EverydayJ1786

6 жыл бұрын

benjaminwayneb . Yes that is obvious . Still anyone mechanical can easily do this

@EverydayJ1786

6 жыл бұрын

mystic1754 . There are no real "solutions" to this problem . Ford on the other hand has added a 3rd injector before the intake valve as a solution

@Taydrum

6 жыл бұрын

Because it works

There's no explanation as to why, but this is solid advice 👍

Screw that. My friend had enough issues with DI. He installed a water injection system. His problem went away! He turns it on every 30 days for one tank. His valves are spotless. So is his pistons... He also uses RXP gas kicker. It removes carbon and prevents carbon build up. To start with... I might add DI vs Port injection. Is not even close to the same. One uses high pressures

1) Catch can's will HELP (not eliminate) filter the oily vapors which CONTRIBUTE to oily deposits on the valves 2) VVT will result in soot on valves regardless of catch cans. This is typically less harmful than oily gunk/depositys 3) in addition to catch cans, I say go bigger turbo, tune, water/meth injection+port injection and this will keep your valves clean. But hey, that's just me.

I have a 2017 Sonata with GDI. No where in the maintenance schedule is intake cleaning mentioned. However I will probably do a BG or Seafoam cleaning myself at 15k mile intervals. Just for my own peace of mind.

@stevenyia2778

6 жыл бұрын

Doug N you dont need to that every 15k miles smh have it check out before doing anything

@stevenfong1928

6 жыл бұрын

Wish I knew about Crc intake valve and turbo cleaner at 10k on my 2015 Sonata. Shit legitimately works to restore power loss from shit caked on the intake valves. I do ride-sharing and my car with 80k has benefited more from using this product than using synthetic oil or changing oil at 3000 miles. Using higher tier gas helps it run a little bit better but doing the intake cleaning and spending the extra money on the cleaner than higher tier gasoline is 100 percent better for Kia's and Hyundais

@dougn2350

5 жыл бұрын

@@stevenfong1928 ... its also important to run fuel injection cleaner at every oil change. Use a cleaner that has PEA like Gumout.

I installed a catch can on my GDI engines early on. I catch a lot of gunk in the can. I also use CRC intake cleaner at every oil change. I use quality synthetic oil and a factory filter every 4500 miles. So far all is well. Kia and a Buick VVT. One has 30,000 one has 40000. Boroscope shows clean valves. I empty the catch cans every 1000 miles.

@banantwon

4 жыл бұрын

troy mahan you were the first person that mentioned your use of synthetic oil. I have a Sonata 2.0T now. 100K miles, no issues or performance dips. I’ve only ever used full synthetic, but it has no catch can. Does the synthetic slow the buildup process at all?? Or is the catch can the key?

Egr valves and crankcase breather valves are to blame!

@GrimYak

6 жыл бұрын

german sheperd yes but it does increase mileage and keep pollutants out of the air. In the past they used to breath ventilation directly into the air.

@TerrencePorretto

6 жыл бұрын

Your right, one false system causing issues to another crap band-aid system #egr, build better engines from the start and cleaner we can be #e85

@QuantumRift

6 жыл бұрын

that's why a catch-can is important. It stops those oily vapors from coating the intake valves.

@mattb3910

6 жыл бұрын

it doesn't "stop" oily vapors. Variable valve timing and valve overlap also lets exhaust gases (especially soot) back into the combustion chamber bypassing the catch can. I have 2 catch cans and was still getting soot (not as much gunk). Started spraying water/meth and aux fuel port injection and that has helped A LOT!

@jonlucas5521

4 жыл бұрын

@@QuantumRift I don't know why that concept is so hard for some people to accept, but you nailed it. In the winter months I collect over a liter of water, oil, and gas in my catch can system, all of which would contaminate the crank case oil, and coke up the intake valve.

These tips help with other things, but not really for carbon build-up. Ford EcoBoost engines had major issues with this buildup when they were only DI before dual-injected. During the 3.5's development torture tests in the F-150 (there are videos of it on KZread) they ran the piss out of it. Constant, prolonged redlining and brutal operating conditions. When they tore it down at an auto show the valves virtually had no carbon build-up at all. I think the best way to prevent gunk is routine Italian Tuneups in combination with quality oil and gas if choosing not to use a catch can. Driving an engine hard for long periods of time will make it so carbon doesn't have time to deposit on the valves.

@autotrader_ca

2 жыл бұрын

Thanks for sharing!

One massive thing you forgot: Driving the cars shorter than 10mins at a time, REALLY increases carbon buildup. I had a buddy with a 2007 Passat with the 2.0t. He drove about 5,000 miles a year. He lived just a bit from work, engine temp gauge never reached in the middle. 40,000 miles later, just a couple years ago, he had an engine light, with misfiring, he noticed it was worse on fuel and it ran a bit rough. What I did was take it on a roadtrip across the country. For the first 2 hours, I locked the transmission into 3rd gear so it was revving at about 4,500 rpm on the highway. I filled it up and left it in D. Engine light went away, power is restored and fuel economy is better than he has ever seen it. Carbon will burn off, the combustion chamber just needs to be piping hot to do it.

@markwilliams6378

6 жыл бұрын

True, engines need to reach proper operating temperature to function properly. Another article I read stated that its good to drive DI cars hard sometimes although not sure if doing that will help remove soot from the valves

@dannymartinez8522

6 жыл бұрын

you filled it up with?

@SpecialVeloce

6 жыл бұрын

That's how they actually do it in Norway, put an old diesel in 2nd gear and drive it hard to get no tickets

@jaimehernandez4962

6 жыл бұрын

In speed we trust.

@stefool

6 жыл бұрын

Italian TUNE-UP :D :D

Straight hotboxing. Feeling lightheaded?

The gunk come from EGR valve I think oil catch can can provent all this problems