GDI Carbon Buildup ? - Page 2 - Kia Forum

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post #11 of 27 (permalink) Old 04-11-2017, 07:33 PM
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Originally Posted by Sloppy View Post
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
I don't believe that would be an ultimate solution.

On my Harley I've vented my crankcase to atmosphere - it's intake port injected, but the oil and oil vapour causes combustion chamber carbon build-up, as was demonstrated by a trial conducted by a few Harley enthusiasts.


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post #12 of 27 (permalink) Old 04-11-2017, 07:48 PM
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Originally Posted by ron1004 View Post
I don't believe that would be an ultimate solution.

On my Harley I've vented my crankcase to atmosphere - it's intake port injected, but the oil and oil vapour causes combustion chamber carbon build-up, as was demonstrated by a trial conducted by a few Harley enthusiasts.
well, venting crankcases to atmosphere is a serious emissions violation. That's what PCV valves are for.

I agree it likely solves or at least seriously mitigates the problem but it's also highly illegal, right?

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post #13 of 27 (permalink) Old 04-11-2017, 11:09 PM
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well, venting crankcases to atmosphere is a serious emissions violation. That's what PCV valves are for.

I agree it likely solves or at least seriously mitigates the problem but it's also highly illegal, right?
Not promoting violation of state laws, but pointing out that the port injection arrangement is not a complete solution, for that you'd still need a catch can etc.

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post #14 of 27 (permalink) Old 04-12-2017, 07:29 AM
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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.
If you mean by "spray it through the intake" as through the throttle body then no it won't clean the valves. You'd have to spray it through the PCV system for it to have any affect.

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post #15 of 27 (permalink) Old 04-12-2017, 10:15 PM
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If you mean by "spray it through the intake" as through the throttle body then no it won't clean the valves. You'd have to spray it through the PCV system for it to have any affect.
Here is one such product. It says to spray it into the throttle body, or anywhere past the MAF. I suppose you could also spray it through the PCV system as well.

CRC Intake Valve Cleaner

There are some interesting looking before and after pictures, but again I've never used it so I don't know.
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post #16 of 27 (permalink) Old 04-13-2017, 07:37 AM
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If you spray it into the throttle body, it will clean the throttle body but it won't get to the valves. The only way to get it to the valves is to spray it through the pcv system.

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post #17 of 27 (permalink) Old 04-13-2017, 09:16 AM
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First off, a disclaimer that I don't own a GDI, and have not spent time cross-checking and confirming information. That said, I've read reports in multiple places that chemicals are not very effective in cleaning carbon from intake valves, once the deposits have reached a certain amount of volume. The alternative I see mentioned most often is walnut shell cleaning, which apparently is a common procedure on other direct injected models, such as the German vehicles.

If the above information is correct, the requirement for a manual cleaning procedure would mean that very few DIYers would be able to do this maintenance (assuming that the cost of the cleaning equipment is high). But perhaps it might be possible to accomplish effective cleaning if chemicals are used immediately when the vehicle is new, and then on a frequent basis going forward. Perhaps someone reading this has good solid knowledge about cleaning these carbon deposits, and can provide additional information.
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post #18 of 27 (permalink) Old 04-13-2017, 10:15 AM
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I run a chemical cleaner through mine every other oil change. I use a product called BG GDI Intake Valve Cleaner every 15000 miles. It's a preventative measure to keep the deposits from reaching that certain amount of volume you speak of. I use a bore scope to view the results. But then, I'm not your average DIYer........
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post #19 of 27 (permalink) Old 04-14-2017, 09:58 AM
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Originally Posted by sblake5 View Post
I run a chemical cleaner through mine every other oil change. I use a product called BG GDI Intake Valve Cleaner every 15000 miles. It's a preventative measure to keep the deposits from reaching that certain amount of volume you speak of. I use a bore scope to view the results. But then, I'm not your average DIYer........
The percentage of direct injection engines appears to be constantly increasing, and I'm aware that I might not be able to avoid them forever. So with an eye on the future, I took a look at the BG product that you mentioned above.

I don't know how close your method is to this vid https://video.search.yahoo.com/searc...f&action=click, but I'm assuming it's similar to what he does. The thing that made me more than a bit queasy was the caution he gave about removing the chemicals, in order to avoid engine damage. My superficial, quick take on this is to wonder if the cure is going to ultimately be worse than the illness. No factual basis for saying that, just something in the gut. But I also have no problem saying that I could be wrong, and that there might be no issues whatsoever with the product if used as directed.

I'm not in any way being critical of what you're doing with your vehicle. You're obviously WAY ahead of the vast majority on these auto forums, and I tip my hat to you for being so proactive. I guess it just comes down to the fact that I don't like direct injection engines, and haven't found anything so far that makes me feel any better about them. But that's just me, and is not meant to detract from what you're doing with your vehicle. I hope this continues to go well for you, and thanks for sharing the information about this product.
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post #20 of 27 (permalink) Old 04-14-2017, 11:34 AM
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He is using the 44K product. Different from what I use. I used to use OTC D-Karbonizer until I began to have difficulty finding it. I used it in my niece's Jetta GDI for years with no ill effects. Well over 150000 miles until she traded it in. Their intake valve cleaner has a very similar chemical make up.

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Last edited by sblake5; 04-14-2017 at 11:41 AM.
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