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  1. #1
    Established Member Two Rings arankaspar1's Avatar
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    Feb 20 2018
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    Should I use additive cleaners to keep the FSI valves clean?

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    Hey guys,
    I've heard that FSI valves get dirty over time and the only way to clean them is to pull them all out.

    I've currently got 94,000 miles and occasionally hit 18PSI with my K04.

    Wondering if anyone has had experience with regular proactive valve cleaning fuel additives and if so what do you recommended?

    Have also read here... something to the effect of the engine being designed to clean itself and there being a sweet-spot to engaging or optimizing this by holding rpm just above 3K for about 15min a week.

    I've used seafoam which only on my 25y/o integra because it was dirty and it did help me pass smog.

    Also don't know if they make special cleaner for fuel stratified engines.

    Any input is appreciated



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  2. #2
    Established Member Four Rings wkhanna's Avatar
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    the fsi engine is direct fuel injection.
    iow, the fuel injector is in the combustion chamber, not up-stream in front of the intake valves.
    fuel additives will have V little, if any effect on the intake valves because fuel never goes past the intake valve.
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  3. #3
    Established Member Two Rings arankaspar1's Avatar
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    Quote Originally Posted by wkhanna View Post
    the fsi engine is direct fuel injection.
    iow, the fuel injector is in the combustion chamber, not up-stream in front of the intake valves.
    fuel additives will have V little, if any effect on the intake valves because fuel never goes past the intake valve.
    I'm mainly concerned about the carbon build up.


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  4. #4
    Active Member One Ring socom458's Avatar
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    Sep 16 2014
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    Central Ohio, United States

    I think you misunderstood the response. Direct injection means the fuel is directly injected into the cylinder s, which means the fuel never passes over the intake valves. Therefore, any additive put in the fuel tank will never pass over the valves, and cannot remove carbon on the valves. Gas tank additive could, potentially help clean a clogged injector, this is debateable. Make sense?

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  5. #5
    Established Member Two Rings ROH ECHT's Avatar
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    Jul 20 2011
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    PNW

    OP...additives will only help injectors. What you've heard about intake valves getting dirty, in reality it's carbon build-up, will need to be cleaned doing one of two things; 1) remove the intake manifold and manually scrape off the carbon or have the valves media blasted...or 2) do a fuel and solvent blow-by.

    I always bore-scope to inspect the condition before doing the blow-by. I use 4 parts fuel to 1 part mineral spirits when needed. I have a diy vid on U2B with links in the description to before and after bore-scope pics showing that the majority is removed with this method; https://www.youtube.com/watch?v=hHF-Jdw0eto
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