GDI Carbon Buildup ? - Kia Forum

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post #1 of 27 (permalink) Old 04-11-2017, 06:53 AM Thread Starter
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GDI Carbon Buildup ?

Hello to all.

I bought 2017 new Kia Cee'd (restyling was 2016) with 1.6 GDI engine. I read that this GDI (direct injection) have
problem with Carbon Buildup (like some TSI engines by VW). Did Hyndai/Kia Corp fix this issue so far, because
they have this engine from 2012? Did Kia Official Service know something about this issue...is it
maybe fixed on the latest models, does it even exist? When i can expect to loose power?



" Even at the first check-up (5,000 miles), borescope footage showed intake valve deposits forming.
At each subsequent check-up, we noticed deposit buildup continued in the intake valves and intake ports."



Thanks a lot.


Last edited by ron1004; 01-25-2019 at 10:35 PM.
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post #2 of 27 (permalink) Old 04-11-2017, 07:07 AM
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Fuel quality issues are more the cause of this than design deficiencies. Thank worldwide emission standards and economy ratings for "ultra precise" spray patterns and such for it also. I have not seen an engine yet that stays "brand new" from any kind of carbon build up, and would suggest the use of a fuel injection system cleaner/treatment in the fuel tank periodically. I know many will say otherwise or not to use. But that is my suggestion, proper dosage and not done every fill up is not going to harm anything. AGAIN my suggestion(opinion).
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post #3 of 27 (permalink) Old 04-11-2017, 09:12 AM
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Quote:
Originally Posted by Stewdza View Post
Hello to all.

I bought 2017 new Kia Cee'd (restyling was 2016) with 1.6 GDI engine. I read that this GDI (direct injection) have
problem with Carbon Buildup (like some TSI engines by VW). Did Hyndai/Kia Corp fix this issue so far, because
they have this engine from 2012? Did Kia Official Service know something about this issue...is it
maybe fixed on the latest models, does it even exist? When i can expect to loose power?



" Even at the first check-up (5,000 miles), borescope footage showed intake valve deposits forming.
At each subsequent check-up, we noticed deposit buildup continued in the intake valves and intake ports."



Thanks a lot.
The problem is that GDI engines have a dry induction path. The fuel is sprayed directly into the combustion chamber. Because of this the incoming fuel that washes down the intake valves in a rail injected engine is absent. For the most part the deposits are thought to be caused by oil being introduced into the intake manifold from the PCV valve. A lot of folks have dealt with this by installing an aftermarket oil/air separator in the hose between the PCV valve and the manifold to trap the unwanted oil.
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post #4 of 27 (permalink) Old 04-11-2017, 10:49 AM Thread Starter
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Okay then. So the problem still persists, although the engine is implanted since 2012...And they are still offering that engine?
Did they fix sometning in a newer models? They are familiar with this problem. Toyota rebuilt their gasoline direct injection engine and fixed an issue.

If not, what can i do as owner of this engine? I don't expect to clean engine at 50 000 km.

Kia Motors know that GDI engine have that issue, and they offer 7-year guarantee, I do not understand how they are worth it. I hope that this problem will not occur to me, fuel quality in my country is very bad.

Thank you all for recommendations for the future.


I'm a little disappointed.
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post #5 of 27 (permalink) Old 04-11-2017, 11:32 AM
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Along with using a so called 'top tier' gasoline or fuel additive if such isn't available in you region, and a good quality synthetic motor old, you can install a catch can as mentioned above:
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post #6 of 27 (permalink) Old 04-11-2017, 04:01 PM
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Quote:
Originally Posted by Stewdza View Post
Okay then. So the problem still persists, although the engine is implanted since 2012...And they are still offering that engine?
Did they fix sometning in a newer models? They are familiar with this problem. Toyota rebuilt their gasoline direct injection engine and fixed an issue.

If not, what can i do as owner of this engine? I don't expect to clean engine at 50 000 km.

Kia Motors know that GDI engine have that issue, and they offer 7-year guarantee, I do not understand how they are worth it. I hope that this problem will not occur to me, fuel quality in my country is very bad.

Thank you all for recommendations for the future.


I'm a little disappointed.
I'm interested to hear how Toyota fixed the issue - could you post some detail on that.

Quality and not quantity counts.

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post #7 of 27 (permalink) Old 04-11-2017, 05:50 PM
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I know Toyota has done some upgrades on their GDI V6s by incorporating a self cleaning feature a couple of years ago but not on the 4cyl that I know of. Nothing you could compare to a Hyundai/Kia GDI 4cyl.

Toyota Advances D4S With Self-Cleaning Feature on Tacoma | Technology content from WardsAuto

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post #8 of 27 (permalink) Old 04-11-2017, 06:13 PM
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I haven't gotten around to it yet (and probably should) but I plan to install a catch can, at least for peace of mind. They aren't too expensive, especially if you pick up a cheap eBay can and modify it so it actually works, so I figure it can't hurt to install one. Although I do remember reading about some guy with a GM product getting his warranty denied(!) because of the catch can, but I have a feeling there's more to that story. On top of that I've read plenty of naysayers online saying that the catch can does nothing, that the liquid it catches is mostly water, and that GDI engines will still build up deposits anyway.

I've also seen "GDI intake valve cleaner" from various companies, basically a spray can that you spray into the intake with the engine running. Supposed to clear away the deposits. Does that work? No idea.

FWIW, prior to my Kia, I had a Mk3 Focus which also had a GDI engine. I wasn't aware of the intake valve buildup problem, and I doubt the previous owner was either, since it was a fleet car from a local food distribution company. It had 80k highway miles on it when I bought it, and I put another 60k on it before it was totaled in an accident. The engine still ran as strong as the day I got it, and felt just as good as the newer ones I test drove.
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post #9 of 27 (permalink) Old 04-11-2017, 06:45 PM
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I have a Ford Edge Sport with 2.7L V6 twin Turbo, and 2400 miles on the clock - need to install a good catch can on it soon.

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post #10 of 27 (permalink) Old 04-11-2017, 06:48 PM
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Quote:
Originally Posted by Stewdza View Post
Okay then. So the problem still persists, although the engine is implanted since 2012...And they are still offering that engine?
Did they fix sometning in a newer models? They are familiar with this problem. Toyota rebuilt their gasoline direct injection engine and fixed an issue.

If not, what can i do as owner of this engine? I don't expect to clean engine at 50 000 km.

Kia Motors know that GDI engine have that issue, and they offer 7-year guarantee, I do not understand how they are worth it. I hope that this problem will not occur to me, fuel quality in my country is very bad.

Thank you all for recommendations for the future.


I'm a little disappointed.
The only fix for this GDI intake valve buildup is to also provide a port or port injectors that can be used to basically rinse the intake valves periodically. Many newer engines from Ford and Toyota, there may be others, now have port injectors as well as direct injectors for this very reason., to keep the valves clean.

Otherwise, an oil catch can can certainly reduce this problem but won't eliminate it.

I suspect as these engines acquire mileage this problem is going to become much more common. I'm not looking forward to it either as I have an SX with GDI
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