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2015 Mazda 3 2.0 - Intake Valve Pics #5286163 12/05/19 03:54 PM
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buster Offline OP
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2019 Frontier Pro 4X - RGT 5w30
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Re: 2015 Mazda 3 2.0 - Intake Valve Pics [Re: buster] #5286171 12/05/19 04:04 PM
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Those are gross.


2005 Honda CR-V EX, 280k
Re: 2015 Mazda 3 2.0 - Intake Valve Pics [Re: buster] #5286213 12/05/19 04:53 PM
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LeoStrop Offline
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Yeah i have seen the same on VAG TSI engines. It was a video posted by a shop around here.

Some of them had less than 50k miles.

The owner of the shop said that they used crushed walnut shell to clean it, just like sand blasting. He said it's the most effective way since the shell could absorb that gunk and it's soft enough to not damage any part.

Here is the link to the video: https://www.youtube.com/watch?v=4-Lw946Ys_8

It's in portuguese but you can see the before and after, and the process of the blasting. That unit had only 53K km (33K miles)

He even said that some cars that sit too long on the shop for maintenance, could have the valves stuck and damage the engine after trying to start it.

Last edited by LeoStrop; 12/05/19 05:17 PM.

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Re: 2015 Mazda 3 2.0 - Intake Valve Pics [Re: buster] #5286219 12/05/19 04:56 PM
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SubieRubyRoo Offline
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I wonder if doing 1 cylinder at a time soak with Kreen filling the closed intake ports for 24 hours, then sucking it out with a transfer pump would clean it off without the need to blast it. You'd obviously suck as much out as possible, pull the plug, and crank it for say 10 seconds to evacuate residuals.

Re: 2015 Mazda 3 2.0 - Intake Valve Pics [Re: buster] #5286342 12/05/19 07:09 PM
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Eddie Offline
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No too bad for 81,000 miles. It would seem that MAZDAS idea to run the intake valves hot, to eliminate carbon build up works but, does not eliminate the issue. Ed


2014 CX5 Touring 2.5L :-)
Re: 2015 Mazda 3 2.0 - Intake Valve Pics [Re: buster] #5286374 12/05/19 07:41 PM
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tig1 Offline
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Doesn't the Ford 2.0 with DI have partial fuel intake with PFI to help reduce carbon buildup? Thought I read that here someplace.


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Re: 2015 Mazda 3 2.0 - Intake Valve Pics [Re: buster] #5286386 12/05/19 07:49 PM
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painfx Offline
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Dang...

Wonder if the Honda Accord GDI has this same problem?

Oil catch can?

Re: 2015 Mazda 3 2.0 - Intake Valve Pics [Re: buster] #5286598 12/06/19 04:48 AM
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wemay Online Happy
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I don't believe any GDI platform has fully eliminated IVD but do believe the severity varies.


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Re: 2015 Mazda 3 2.0 - Intake Valve Pics [Re: buster] #5286604 12/06/19 05:25 AM
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wemay Online Happy
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In addition, for the Hyundai/Kia owners out there...

As other manufacturers already have, Hyundai/Kia have now introduced a new engine design for 2020. Called Smart Stream, the 1.6T and 2.5 use GDI in combination with MPI. This might be the only way to mitigate the issue.


2019 VW Passat Wolfsburg TSI
Castrol Edge Professional LL IV FE 0W-20, OEM

2013 Hyundai Santa Fe Sport 2.0T
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Re: 2015 Mazda 3 2.0 - Intake Valve Pics [Re: buster] #5286615 12/06/19 05:50 AM
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PimTac Offline
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Maybe it’s just me but those pictures were not that clear so I couldn’t see the buildup clearly. It’s there I know.

This car experiences cold winter temperatures which might exacerbate the problem by running rich longer than usual.

What was interesting was the poster’s comment that he never detected any problems nor did the engine throw any codes. After the fix, the engine ran as it always had.


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Re: 2015 Mazda 3 2.0 - Intake Valve Pics [Re: painfx] #5286617 12/06/19 05:53 AM
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SubieRubyRoo Offline
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Originally Posted by painfx
Oil catch can?


Already been covered time after time after time... everybody that uses them claims they're the cat's tushy, but there is no "proof" to support it (as in anything other than internet stories).

If there was something to the catch can idea that saved this from happening to the intake valves (and probably some warranty claims also), OEMs would have some version of it, like a DEF tank but used as a collection point that needed dumped/serviced every OCI or something.

Re: 2015 Mazda 3 2.0 - Intake Valve Pics [Re: PimTac] #5286626 12/06/19 06:19 AM
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wemay Online Happy
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Originally Posted by PimTac


What was interesting was the poster’s comment that he never detected any problems nor did the engine throw any codes. After the fix, the engine ran as it always had.


I agree. I think we go looking for problems for a solution sometimes.


2019 VW Passat Wolfsburg TSI
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2013 Hyundai Santa Fe Sport 2.0T
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Re: 2015 Mazda 3 2.0 - Intake Valve Pics [Re: buster] #5286632 12/06/19 06:33 AM
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Eddie Offline
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We should remember that crud on the intake valves on a DI engine only disturbs air flow. Crud on a port injection can momentarily hold the fuel and that leads to rough idling and poor preformance overall i.e. BMWs problem years back. Ed

Last edited by Eddie; 12/06/19 06:34 AM. Reason: Add information

2014 CX5 Touring 2.5L :-)
Re: 2015 Mazda 3 2.0 - Intake Valve Pics [Re: buster] #5286645 12/06/19 06:57 AM
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demarpaint Offline
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I can only imagine what they'd look like under my driving conditions, no thanks. His driving pattern is near perfect.


God Bless Our Troops

Re: 2015 Mazda 3 2.0 - Intake Valve Pics [Re: buster] #5286660 12/06/19 07:32 AM
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PimTac Offline
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Something else to consider, this car was running for some time prior to the SN+ oils.

It would be fascinating if we could compare any changes from the oils of 2015 to today’s oils.


2017 Mazda CX5
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