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Thread: Any direct injection owners here?

  1. #1
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    Default Any direct injection owners here?

    I bought my first direct injected engine in a 35k mile Audi S5 4.2. Reading the Audi forums caused me to think that my cold start stumbling might be due to gunked up intake valves. Cuz I'm me, I bought a set of intake gaskets, a media blaster, and 25 lb of crushed walnut shells to deal with it. I drilled a hole in a shop vac attachment so I could suck up the shells as I blasted them. So far the project is going well.

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    Jeff
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  2. #2
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    Default

    That's amazing.

  3. #3
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    Yes. I've had several
    direct injection engines and working on the ecoboost.

    i was the one that diagnosed the problem for BMW 7 years ago.
    there is maintenance. Fabricate a tool that can high-pressure clean the back side of the valve, if there's not one available.
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  4. #4
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    A lot of people are adding port injection which I guess helps or eliminates that issue

  5. #5
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    Quote Originally Posted by Hoover View Post
    Fabricate a tool that can high-pressure clean the back side of the valve, if there's not one available.
    I guess you didn't actually read my post.
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    Jeff
    Noble parts for sale, see my Noble website: http://Noblecars.org

  6. #6
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    That valve buildup sure looks wet, fuel, oil? Kinda looks like your valve guide seals are shot and oil's leaking down from above.

    From what I gathered the newer DI engines are engineered to avoid the issues that the Audi di's had. The injectors are supposedly placed better so it avoids excessive carbon buildup that can hinder fuel delivery.

    BTW nice method of cleaning without pulling the heads.

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