GDI carbon buildup/ CRC intake valve cleaner - Kia Forum

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post #1 of 5 (permalink) Old 09-06-2018, 08:14 PM Thread Starter
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GDI carbon buildup/ CRC intake valve cleaner

I'm aware of and understand the carbon buildup on the rear of the intake valves on GDI engines. Being conscious of this, I've been looking into the issue and read about the CRC Intake Valve and Turbo Cleaner that can be used to remove carbon I wonder if it really works and could be used as a preventative measure to prevent the carbon buildup issue. I'm wondering if anyone has any personal information on this product. Does it really work, is there any negative effects that it can cause, is it just a over-hyped scam? If anyone has additional information on this, please enlighten me. I'd be using it more as a preventative measure at this point on my 2019 3.3l v6 Sorento.

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post #2 of 5 (permalink) Old 09-09-2018, 01:24 PM
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Good question! I’m a bit “scared” to use it on my ‘17 Sorento V6 with 16k miles.

I’ve cleaned the throttle body... which was simple enough... but dumping a full can of intake cleaner on top of those valves I’m not so sure of. I’ve heard everything from it being “snake oil”... to folks who use it yearly with 250k+ on their engines that swear by it.

Apparently the older “Lambda” and “Theta” engines have a way to spray gas on top of the valves... but our newer 3.3L V6’s I have no idea.

If anyone knows specifically about the 3.3L V6... we would like to hear from ya!

I’m the type that likes to leave an engine alone as long as it’s under comprehensive warranty... so I’m not doing a thing until I get a good idea what’s going on.
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post #3 of 5 (permalink) Old 09-09-2018, 07:09 PM
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To both of you....
You need to research "oil catch cans"...

The carbon build up comes from reusing crankcase air by rerouting it to the throttle body... This "air" contains oil from blow by that would in older engines be washed off the valves with the gas injected into the intake manifold... Because the newer engines now inject gas directly into the cylinders (bypassing the intake valves) the oil never gets washed off and ends up cooking on the valves and coating the inside of the intake manifold...

I just purchased a salvage 2014 Optima GDI with 56k miles on it... It had the plastic intake manifold there was oil covering the insides and the intake valves were just forming carbon buildup...

A oil catchcan re-routes the PCV air through it and the baffles and filter material catch the oil (and other deposits) and still allows the air to be recirculated through the engine... You can then drain the can of the oil...

watch this...
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post #4 of 5 (permalink) Old 09-11-2018, 10:16 AM
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Do the newer Sorento's have the extra injectors that wash over the valves?
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post #5 of 5 (permalink) Old 09-11-2018, 10:19 AM
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No, no extra injectors. That would drive the cost and complexity way up.
Never happen.
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