Black smoke staining bumper

[DRS]

Thanks for the CRC tip. Wonder if that is like the old GM carbon X product? This might be a routine process to prevent a larger build up that can happen in 10k miles. Still, this has to be inserted someplace past the filters and intake plumbing. As a fine mist direct into the air flow in the intake manifold. In a 2012, maybe past the small filter? Not sure in 2015. Plus have to stand there and slowly allow a mist to enter from the can over 10-15 minutes.

 

[Batwingz]

The direction say specifically and several times over....AFTER THE MAF SENSOR. This stuff and most throttle body cleaners will destroy a MAF sensor in a few seconds. It is a simple process. Take the top off of the air filter box, disconnect the wire going to the MAF and then use a 10mm driver to loosen the hard tube going to the intake. You can spray the stuff in there without issue.

 

[Batwingz]

Forgot to mention that when you run the engine, or for that matter even turn on the car without starting and the MAF is disconnected, you will get a CEL light. Once everything is hooked back up for normal use, the CEL will go out after a few engine start cycles.

 

[T_D_Diggs]

I'd love to know how a fuel additive cleans off the back of the intake valves in an engine design where the back of the intake valves never see any fuel.

It's a multi part product. There is a fuel system cleaner/fuel additive and a throttle body/intake spray cleaner. I am not recommending nore refuting them in general.
I was simply saying that Hyundai Canada is recommending using them with every oil change. And that I had a rough idle issue that seems to have improved since using it.

 

[flynblind]

I also had this problem. The exhaust during heavy throttle would emit a cloud of smoke similar to an old diesel engine. I do not believe that it is one issue making this exhaust smoke. I believe that it is a combination of fuel (ethanol in particular), restrictive air intake, and restrictive exhaust.

My car would produce a nice cloud of smoke and after 2 weeks would have a dark, spotty black rear end where the soot would collect on the bumper and trunk lid.

I noticed the first improvement by replacing the intake system with the R2C CAI. this reduced the amount of deposits. I also noticed a change when I replaced the exhaust with a cat back system. I also started putting only pure gasoline in my car.

I now have not seen a single puff of smoke out of my rear end and have zero black soot on bumper or trunk lid. I have even gone ahead and polished my chrome bumper exhaust tip so that they shine like new. It has been about 1 month since I did all of this and the exhaust tips are still as clean as when I polished them.

 

[DRS]

Good feedback.

 

[ppanhorst]

I am no engineer, but even I know that black soot is the byproduct of incomplete combustion. It is simply running too rich! It doesn't matter whether the engine is fuel injected, direct injected, or has carburators, a rich mixture will stain the exhaust pipes. Maybe if Hyundai would have come out with a way to lean the mixture, they could have saved the mileage lawsuit.

Has anyone tried an aftermarket 'power chip' to find out if that might provide a leaner mixture and solve the problem?

 

[PMCErnie]

I am no engineer, but even I know that black soot is the byproduct of incomplete combustion. It is simply running too rich! It doesn't matter whether the engine is fuel injected, direct injected, or has carburators, a rich mixture will stain the exhaust pipes. Maybe if Hyundai would have come out with a way to lean the mixture, they could have saved the mileage lawsuit.

Has anyone tried an aftermarket 'power chip' to find out if that might provide a leaner mixture and solve the problem?

Maybe you should enlighten Hyundai's engineers.

 

[Sam Hamen]

I did a muffler silencer delete and left my stock muffler on the car.

Hi Chris,
I,m new in this forum
did a muffler silencer delete helped the black smoke staining bumper?
I Have a 2012 white genesis 3.6 premium with approx. 33 k miles on it


Thanks

Sam Hamen

 

[4104]

I just noticed the black soot on a white Genesis do not know what year? All the rear markings were on the right rear saying Genesis. It looked inside like a Ultimate.
Have Hyundai solved the soot problem on the 2015?

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[05king]

I have a 2014 Rspec with less than 1k miles and it has black all over the bumper. This problems is not from something being dirty. My car is brand new and does it. I agree black smokes = too rich.

 

[xiaphin]

I am no engineer, but even I know that black soot is the byproduct of incomplete combustion. It is simply running too rich! It doesn't matter whether the engine is fuel injected, direct injected, or has carburators, a rich mixture will stain the exhaust pipes. Maybe if Hyundai would have come out with a way to lean the mixture, they could have saved the mileage lawsuit.

Has anyone tried an aftermarket 'power chip' to find out if that might provide a leaner mixture and solve the problem?

There is no 'power chip' for the ECU. Only one company, BTR, has cracked the 3.8 and 4.6 in order to perform a tune. No crack on the 5.0 yet.

 

[Top Gear]

Is this thread for real?

...Don't lose your lunch over it. Wipes right off. Just two posts here and you've talked yourself into a fainting spell.

Yep How hysterical is this thread?? It's like watching one guy trying to milk a bull, while another holds a sieve underneath to catch the spoils, while a third posts the "Cowspiracy" video to FaceTube

To those of you who are preparing your class action suit over this, let me guess:
- You pump cheap regular gas in your luxury/performance car?
- You never drive/rev hard?
- You make mostly short trips?
- You don't wash your light-colored car very often?

Guess what, there will be black soot building up, among other issues, eventually.

Yet, your Genesis engine is extremely well-engineered and tightly managed by computers every second it is running. Virtually all newer cars produce this soot, because their computers run the engine richer when the engine is started cold so that it runs smoother - thus fooling us that it's warmed up when it really isn't. You can also dump a lot of soot from the exhaust system, say when passing someone, when such moments are very rare for you and/or if your fuel is crappy. Both situations overwhelm the catalytic system.

Ethanol fuels have an impact, and for this and a dozen other reasons you need to be running premium "Top Tier" gas (Shell, Chevron, QT, for examples, not gas from grocery stores, mini-marts, etc). The restrictive CAI can be opened up, too, if you're interested in performance, but it's not necessary, because your engine was designed to be efficient in stock form. The computer will retune the engine to take advantage of any better airflow and better gas, as well as retuning as the engine fully warms through to operate in its ideal range.

Still, after all that, there will still be minor soot, whether you see it or not. My car has this soot on the exhaust tips, too (although minimal), and is port-injected, runs on the best gas, has a non-restrictive modded CAI. So, avoid short trips. Punch it more regularly, like exercise for your engine. Stop running cheap gas. Wash and wax your car regularly as well. All recommended maintenance for a great many reasons.

Forgive the sarcasm

 

[sofaking427]

F.Y.I
Hyundai and Kia Clean Air Act Settlement




(Washington, DC - November 3, 2014) – Automakers Hyundai and Kia will pay a $100 million civil penalty to resolve alleged Clean Air Act violations based on their sale of more than 1 million vehicles that collectively will emit approximately 4.75 million metric tons of greenhouse gases (GHG) in excess of what the automakers certified to the EPA. The companies will forfeit GHG emission credits in order to put the companies in the place they would have been had they accurately reported the GHG emissions from these vehicles in the first place. The companies also will take measures to prevent future violations. On November 3, 2014, the EPA and the U.S. Department of Justice (DOJ) announced this settlement, and lodged a consent decree embodying the settlement in the United States District Court for the District of Columbia. The California Air Resources Board joined the United States as a co-plaintiff in this settlement.


Settlement Resources

•Press Release
•Consent Decree and Complaint
•Defendants
•Clean Air Act Certification Requirements
•Alleged Violations
•Injunctive Relief
•Health and Environmental Benefits
•Civil Penalty
•Comment Period
•Contacts

Defendants
•Hyundai Motor Company is a light-duty motor vehicle manufacturer headquartered in Seoul, South Korea. In 2012, the company manufactured over 4.4 million cars and SUVs, and sold approximately 19 percent of them in North America. The company owns a portion of Kia Motors Corporation, and each belong to Hyundai Motor Group, which is one of the world’s largest automakers.
•Hyundai Motor America is the American sales, marketing, and distribution subsidiary of Hyundai Motor Company. This company is based in Fountain Valley, California.
•Kia Motors Corporation is a light-duty motor vehicle manufacturer headquartered in Seoul, South Korea. In 2012, the company manufactured over 2.7 million cars and trucks, and sold approximately 20 percent of them in North America. Again, Hyundai Motor Company owns a portion of Kia Motors Corporation. Importantly for this enforcement case, both companies utilize the same corporate group to perform vehicle emission testing for EPA certification.
•Kia Motors America is the American sales, marketing, and distribution subsidiary of Kia Motors Corporation. The company is based in Irvine, California.
•Hyundai America Technical Center, Inc. handles design and engineering matters for North American Hyundai- and Kia-brand vehicles. This company is based in Superior Township, Michigan.

 

[RonJ]

When I first got my Genny in 2013, I wasn't impressed by the black crap on the exhaust outlets and white bumper. I'm not going to speculate on why the soot was there or why soot stains stopped forming. Same fuel, top tier regular, name brand dino oil, if anything, I was driving it harder then when it was "brand new". Highway driving, I'm around 30mpg cruising at 70mph.

So just saying, soot was there brand new, by the second oil change, not enough soot to worry about. Maybe the 'puter uses a higher fuel trim when the engine is new?

RonJ ....

 

[Gary7]

I didn't read through all ten pages of this thread, so this may have already been addressed.

A common problem with GDI engines is excessive soot production. The stains on the bumper are from the soot and not an indication of an excessively "rich" fuel/air mixture or anything amiss. It's basically the same problem owners of Mercedes diesel cars had thirty or forty years ago.

Here are some links on this topic:

http://www.google.com/url?sa=t&rct=...hzCkkMvk-B1yRWrcg&sig2=uEsHRakQxnw7Hz-TXkFPrQ

http://articles.sae.org/13624/

http://www.sciencedirect.com/science/article/pii/S0301679X15000432

 

[larrya100]

I also had this problem. The exhaust during heavy throttle would emit a cloud of smoke similar to an old diesel engine. I do not believe that it is one issue making this exhaust smoke. I believe that it is a combination of fuel (ethanol in particular), restrictive air intake, and restrictive exhaust.

My car would produce a nice cloud of smoke and after 2 weeks would have a dark, spotty black rear end where the soot would collect on the bumper and trunk lid.

I noticed the first improvement by replacing the intake system with the R2C CAI. this reduced the amount of deposits. I also noticed a change when I replaced the exhaust with a cat back system. I also started putting only pure gasoline in my car.

I now have not seen a single puff of smoke out of my rear end and have zero black soot on bumper or trunk lid. I have even gone ahead and polished my chrome bumper exhaust tip so that they shine like new. It has been about 1 month since I did all of this and the exhaust tips are still as clean as when I polished them.

Hi, it's been a while since your post (regarding the black exhaust soot) and I wanted to check in and see if you are still soot free? I really cannot stand the massive soot issue on my beautiful white Genesis, however your fix is a bit of an investment and I wanted to be sure that it's continuing to work for you before I pull the trigger on buying. Also can you send me info on the exact products? I am seeing many variations of the black cat type exhaust. And a search for the RC2 CAI takes me to a Genesis Coupe page where there appears to be no part for the sedan. Thanks!

 

[Rspected]

Its just soot, its a by-product of combustion. Wipe it off and keep wax on it so it cant stick and wipes easier each wash. The cloud was probably from you mashing the pedal pushing it out faster than normal.

 

[larrya100]

So I understand that there are many opinions out there, and it's just a car. I'm a bit anal in keeping my car clean and wash with only top quality "Chemical Guy" products. I use a product called "Jet Seal" (yes as in used on jet airplanes) followed up by a carnuba wax. Every time I wash my car the soot will not come off as it's imbedded in the wax, and I need to use an agressive cleanner that strips the wax. This means I need to wax the rear bumper every time I wash. But what makes things more frustrating is that in two days it looks like crap again. I see by your pic that you have a silver Genesis sedan. My white one gets heavy black soot within two days of washing. I spend a lot of time on the freeways. Every light colored Genesis seems to have this issue. I see very few other cars with this soot rear end. Lexis, Acura etc never. Just sayin. I'm glad that you're not dealing with the same frustration.