[ivanvwhite]

Only the 2.5 has this feature. The hybrid 1.6 injects only into combustion chamber with one injector. Hence the need for an oil catch can, but that's a whol other issue. I have installed a catch can on my hybrid and it's amazing how much oil/water it catches that does not get onto the back of my valves and gum them up.

 

[RAYMUND155]

Interesting..have never heard about that feature (injector spray partially hitting intake valve). Searched Hyundai sites without success. Can you point me towards a link that details this feature more ?

Thanks

The Hyundai Technology (Patent(s) are in US, Japan, Korea, EU, China, etc.) is named "Smart-Stream" direct fuel injection. One or more injector nozzle hole(s) are precision drilled to squirt fuel directly at the intake valve to wash away carbon deposit.

Everyone else use dual fuel injectors to prevent carbon build up on intake valves and port.

 

[Tampa8]

The Hyundai Technology (Patent(s) are in US, Japan, Korea, EU, China, etc.) is named "Smart-Stream" direct fuel injection. One or more injector nozzle hole(s) are precision drilled to squirt fuel directly at the intake valve to wash away carbon deposit.

Everyone else use dual fuel injectors to prevent carbon build up on intake valves and port.

Again just to be clear only on the 2.5L in the ICE. The Hybrid does not have that it is a not a Slipstream, GDI only?

 

[rogerdodger2]

Again just to be clear only on the 2.5L in the ICE. The Hybrid does not have that it is a not a Slipstream, GDI only.

Correct, the 1.6 in the hybrids is a Smartstream.

 

[Tampa8]

Correct, the 1.6 in the hybrids is a Smartstream. View attachment 491835

Though I misspoke using the the term "smartstream" the issue is the same. It is a smartstream engine in the Hybrid, however only GDI without port injection, unlike the 2.5L Smartstream that has multiport.

 

[Mr.mensa]

Using a gasoline/ethanol mixture in small engines such as lawnmowers can be problematic because ethanol is corrosive to plastic and rubber. Small engines typically use rubber hoses and plastic parts in their filters and carburetors.

 

[RAYMUND155]

Correct, the 1.6 in the hybrids is a Smartstream. View attachment 491835

Thanks, I should have done the same by posting a photo. Thank you.

Best Wishes

 

[88founder]

Does anyone feel as I do? If you usually run good, Top Tier gas in your car(s), it's a waste of money and of dubious value to pour fuel additives into your gas. It might even void your warranty. Top Tier additives are included in the price of gas, so you're not even paying any more for good quality gas--especially if you buy it at Costco.

Costco gas is top tier

 

[hotlynx16]

Costco gas is top tier

True,but also it is recommended in my manual that you put a fuel additive in at every oil change! I use Chevron Techron in my 2018 sonata after every oil change! It is the only one I trust and from what I have read Hyundai dealers use it also! Had a bad experience with STP additive back in 2001!

 

[Titanic1985]

Lots of answers regarding fuel treatments BUT no one yet has commented about at what mileage did the injector issues surface??
I'm also in the same camp as the poster who said the 10% ethanol in today's gasoline is causing gumming issues......look what it does in lawn mowers, etc where folks use gasoline with ethanol in it, put the equipment away for the season and next season they don't start because the fuel system is all gummed up...

Pure-gas.org - ethanol-free gasoline in the U.S. and Canada

Pure-gas.org is the definitive web site listing stations that sell pure gasoline in the U.S. and Canada.

www.pure-gas.org

Hello. As a contributor and user of the website www.pure-gas.org since 2010 I've found it to be a valuable resourse. This is a one-person website and the users are also infact the contributors. If you find an innacurate listing (either the station no longer sells E-0 non-ethonol gas or a station has added it to their other fuel offerings) feel free to submit a correction to help others. Sometimes the gas stations are no longer in business. There are some areas of the country where E-0 is not available (reason unknown).

As the owner of many small engines (e.g., two wood chippers, lawn tractors, a Honda ATV, leaf blowers, chain saws, etc) I always use E-0 non-ethonal fuel to maintain my ten acres and never have had engine / carburetor issues. Prior to 2010 I did use E-10 Ethanol and had to replace a Honda and Briggs & Stratton carburetor ($75 & $50 respectively) due to extensive corrosion damage to the metal housing.

Best Wishes.

 

[Dog Patch Steve]

Interesting..have never heard about that feature (injector spray partially hitting intake valve). Searched Hyundai sites without success. Can you point me towards a link that details this feature more ?

Thanks

Only if "port injected" / carb'd where intake runners wet with incoming fuel

GDI injector nozzle only spray inside the chamber. There is no way for a GDI injector to squirt back at intake

 

[88founder]

True,but also it is recommended in my manual that you put a fuel additive in at every oil change! I use Chevron Techron in my 2018 sonata after every oil change! It is the only one I trust and from what I have read Hyundai dealers use it also! Had a bad experience with STP

 

[88founder]

True,but also it is recommended in my manual that you put a fuel additive in at every oil change! I use Chevron Techron in my 2018 sonata after every oil change! It is the only one I trust and from what I have read Hyundai dealers use it also! Had a bad experience with STP additive back in 2001!

Yes good idea.

 

[Probity]

I'm a "Yay" on periodic use of fuel system cleaners, regardless of if you have a forced induction (turbo) DI engine or naturally aspirated MPFI-only engine (or a naturally aspirated DI/MPFI like the non-turbo 2.5 Smartstream), even if you religiously use Top Tier gasoline.

Look for a product with a polyetheramine (PEA) additive, that's the secret sauce good cleaning agent. Techron Concentrate Plus (1 US oz. per 1 US gal., 10%-20% PEA, prod. code 266701) is a good product. So is BG Platinum 44K (1 US oz. per ~1.9 US gal., 25%-50% PEA), Gumout Regane Complete Fuel System Cleaner (1 US oz. per ~1.6 US gal., 10%-30% PEA), Red Line SI-1 (1 US oz. per ~1.33 US gal., 30%-40% PEA), etc. The higher the % PEA in a bottle/can, the more gasoline volume that 1 US oz. can treat. Obviously the higher concentrates costs more per bottle, you can do your own cost/benefit analysis.

In many cases, a company's "high mileage" fuel system cleaner will have a higher PEA content than their standard fuel system cleaner. Case in point Techron High Mileage Fuel System Cleaner (it doesn't say 'Concentrate Plus' on the label) - it has from it's SDS 20%-25% PEA, treatment is 1 US oz. per ~1.75 US gal., so it's a little 'beefier' than the Techron Concentrate Plus.

Chevron USA's SDS components for their Techron products don't say PEA, they say Trade Secret - but it's PEA. Check out Chevron's SDS site Home (chevron.com) , search Asia Pacific / Singapore / Techron, you'll find Techron Concentrate Plus (Caltex, prod. code 510722) - SDS for it does say under components 10%-20% PEA (whereas the USA just has Trade secret). It's the same product.

Hyundai's 20 oz fuel system cleaner bottle is just rebranded 20 oz. Techron Concentrate Plus (as per a call I had with Chevron Lubes dept.) at ~twice the cost of Techron at auto parts store, Amazon, etc.

 

[drb1956]

I think the best way to keep intake valves clean is the GDI Intake sprays while engine is running at 3,000 RPM's. Try to get the whole can sprayed. Between dust, dirt, oil vapors, and such, those valves get really dirty. Also, you should look at your throttle body! You would not believe how much dirt, combined with oil vapors build up right where the throttle plate sits at idle!! Like a ring all the way around. The GDI spray does a decent job, but you may need to remove the throttle body, and also use a toothbrush, not aggressively, combined with the spray to remove that ring of dirt. My Sonata idles better, and throttle response is great. I have cleaned mine twice since I have owned my Sonata, now with 94,600 miles on it.. Using Techron, or the like, will keep your injectors clean, especially if you are NOT using a Top Tier gasoline regularly...

 

[1Robert1]

True,but also it is recommended in my manual that you put a fuel additive in at every oil change! I use Chevron Techron in my 2018 sonata after every oil change! It is the only one I trust and from what I have read Hyundai dealers use it also! Had a bad experience with STP additive back in 2001!

As an occasional STP user, What kind of problem did you have with STP? And which one?
I occasionally use the STP Super Concentrated Fuel Injector Cleaner...
I have noticed that using it in a super dirty fuel system, it sometimes works too good - where the fuel pump burns up due to all the "black" gunk gets cleaned off the components and clogs or makes the fuel pump overheat and ultimately burns out

 

[Vinnny]

I think the best way to keep intake valves clean is the GDI Intake sprays while engine is running at 3,000 RPM's. Try to get the whole can sprayed. Between dust, dirt, oil vapors, and such, those valves get really dirty. Also, you should look at your throttle body! You would not believe how much dirt, combined with oil vapors build up right where the throttle plate sits at idle!! Like a ring all the way around. The GDI spray does a decent job, but you may need to remove the throttle body, and also use a toothbrush, not aggressively, combined with the spray to remove that ring of dirt. My Sonata idles better, and throttle response is great. I have cleaned mine twice since I have owned my Sonata, now with 94,600 miles on it.. Using Techron, or the like, will keep your injectors clean, especially if you are NOT using a Top Tier gasoline regularly...

If the throttle body was cleaned, would a TB reset (via scan tool) be necessary ? When I removed and cleaned the TB on my 2014 Buick Regal GS I did a reset afterwards.

 

[drb1956]

If the throttle body was cleaned, would a TB reset (via scan tool) be necessary ? When I removed and cleaned the TB on my 2014 Buick Regal GS I did a reset afterwards.

Not necessary with a scan tool. I start the car, and let it idle for a couple of minutes for the puter to figure itself out, and then raise the RPM's to around 3,000 a couple of times. My throttle response, and idle are very good. I have cleaned mine twice, and I think it pays off. My Sonata has plenty of giddy-up off the line, and great fuel mileage...

 

[stevepribila34]

Actually I have seen bungs for adding a boost gauge line..could be used as an injection port then plugged. The TSB about my 1.6L SmartStream G HEV needing a steady diet of injector cleaner and addressing of GDI intake valves got me on this subject.

Marvel Mystery Oil

 

[drb1956]

Marvel Mystery Oil

I love that stuff, just not sure how it works for today's vehicles. Oil, gas, you choose.. It should help clean/lube injectors, fuel pump, valves, if you put it in the tank. And will help oil clean some of the stuff oil leaves behind with city, or severe use driving if you put it in the crankcase.. Oils today are really great by themselves, but an older vehicle could use some help trying to keep internals clean...