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Cleaning hidden ICV part 900

posted by  Amarin on  Thu Feb 9 06:58 CST 2017
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last visit: Thu Oct 23 22:42 CST 2014
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Hi ALL,

I'm just finished cleaning the engine bay, grounding points, starter terminals, throttle body and ICV. And I've discovered that just by spraying some carb cleaner into the ICV isn't doing enough to clean all the crud. A part of the idle valve is well hidden even to rigorous spraying and shaking (this how I've done before as long as I could remember).

In cleaning the ICV anyone would have to use some kind of long tool (i.e. a screwdriver shaft) to manually ROTATE the internal valve to open (somewhat like a revolving door) to EXPOSE the hidden valve part and SPRAY the cleaning agent there too.

Now my idle is as smooth as ever.

Regards,
Amarin.








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    Which IACV are we discussing? 900

    uid 27's pic
    posted by  Art Benstein on  Thu Feb 9 10:04 CST 2017
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    last visit: Fri Oct 17 20:10 CST 2014
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    Bosch or Bendix?

    I've collected a few and built a PWM switch to test them, but what Spook's reply seems to imply is a method for cleaning the Bosch rotary version.
    --
    Art Benstein near Baltimore

    "I'll re-use a styrofoam coffee cup until it starts to develop soft spots in the sides."








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      Which IACV are we discussing? 900

      posted by  spook on  Thu Feb 9 12:59 CST 2017
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      last visit: Fri Oct 24 08:06 CST 2014
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      Dear Art Benstein,

      Hope you're well. I use a similar method for Bosch and Bendix Idle Air Control Valves (IACV). During cleaning, I keep the "hose end" pointed downwards.

      As You correctly noted, the Bosch IACV requires rotating the valve's "cylinder" for cleaning. On the Bendix IACV, the valve's "cylinder" must be pushed rearwards (i.e., toward the end with the electrical connector).

      On both IACV types, I use a non-metallic rod to move the valve's "cylinder", and then use cotton-tipped swabs and pipe-cleaners saturated with carb cleaner to remove any carbon, dirt, etc.

      My goal is an IACV that is as clean as "factory-new".

      Hope this helps

      Yours faithfully,

      Spook








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      Which IACV are we discussing? 900

      posted by  Amarin on  Thu Feb 9 11:29 CST 2017
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      last visit: Thu Oct 23 22:42 CST 2014
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      Its Bosch. As I gathered from previous other posts (plus yours too, Art) these IACV operate by vibrating the motors. The "hidden" part of the valve I mentioned is where the crud could still be (after simple cleaning) thus interfering with the motor's vibration (that which opens the air pathway for idle).

      Regards,
      Amarin.








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    Cleaning hidden ICV part 900

    posted by  spook on  Thu Feb 9 09:30 CST 2017
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    last visit: Fri Oct 24 08:06 CST 2014
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    Dear Amarin,

    Hope you're well. When I clean an Idle Air Control Valve (IACV), I take care always to keep pointed downwards, the end at which the hoses connect. That keeps solvent out of the valve's motor compartment.

    To clean readily-accessible areas, I use cotton-tipped swabs soaked in carb cleaner. Areas behind the valve's "cylinder" - that rotates to allow air to pass - can be accessed through the hose opening, that is perpendicular to the valve's axis.

    To clean the valve's chamber - the area wherein the valve's "cylinder" rotates - I use a smoker's pipe-cleaner, soaked in carb cleaner. These pipe-cleaners can usually be had where pipe tobacco is sold. These cleaners are a long (6" / 150mm) thin (1/8" / 3.5mm) brush made of cotton fibers secured by twisted strands of very soft iron wire.

    I turn the valve's "cylinder" with a pencil tip. Any plastic or wood pointed rod can be used: neither will scratch the "cylinder". Because the pipe-cleaner is flexible, it conforms to the valve chamber's shape. It may take several pipe-cleaners to get the job done. When the pipe-cleaner is a pale gray, I figure the valve chamber is clean.

    Hope this helps.

    Yours faithfully,

    Spook








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      Cleaning hidden ICV part 900

      posted by  Amarin on  Thu Feb 9 11:45 CST 2017
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      last visit: Thu Oct 23 22:42 CST 2014
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      Thanks for the detailed info Spook!

      The valve chamber rarely have any crud in my experience. The reality is when I clean my IACV all this while I don't get much idle improvement. That's until I discover this hidden part of the valve which is still full of crud after doing my old style cleaning.

      Your method to use a pencil is spot on!

      Regards,
      Amarin.

      p/s - I do have pipe cleaner. I smoked pipe but have stopped long time ago. I now use pipe cleaners to clean those female banana speaker terminals on my hifi.







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