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Old 10-02-2001, 05:33 AM   #1
Heartbeat - '95 SL2
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1995 SL2
Default Throttle Body and Idle Air Control Valve Cleaning

There've been plenty of posts about how to clean both the throttle body and idle air control valve, but I have one question. In the Chilton manual, it says to avoid getting carb cleaner on the idle air control valve, and to remove it if necessary. In the picture where the hands are spraying off the carbon, it looks like they've removed it. I remember reading someone here actually soaks the idle air control valve while the throttle body is on the car, with no ill effects. How important is this? I'm going to do this right, and remove the throttle body. I was planning on getting both sparkly clean . . .

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Old 10-02-2001, 07:40 AM   #2
David 93 SL2m
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You will go into shock when you look into the intake manifold and see years/miles of carbon buildup and gunk inside... When you get the throttle body off, hold a flashlight in one hand and a telephone in the other hand so you can call 911 after you shine light in there!

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Old 10-02-2001, 09:07 PM   #3
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heartbeat, it was i, therapist who posted that soaking of the IAC valve with it still in the throttle body. it really is up to you if you want to soak it. if you do, don't let it stand for long since the throttle body cleaner might ruin the o-ring seal though in my case it never did. i usually soak it between 45sec to 1 min, run the engine then spray some more. it really cleans it almost as good as removing it from the body. one time i used saturn/ GM top engine cleaner to soak, now that ruined my IAC valve and ate through the o-ring seal. goodluck.

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Old 10-02-2001, 09:18 PM   #4
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Heart beat
Do a search of the threads for cleaning the t-body I thing I've done a few descriptions on how I do it. If you can't find anything let me know. If you use a product specificly designed for cleaning air intake systems you should be ok.

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Old 10-03-2001, 06:06 PM   #5
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I see the same thing when taking off the T-body, looks like a mine inside my intake manifold.

So cleaning the T-body only is like dealing with the tip of an iceberg....any effective ways to clean out the inside of the manifold without remove the darn thing? Guess it's not possible, huh?

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Old 10-03-2001, 10:00 PM   #6
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Excellent! I am not the only one that went into shock when peering into the intake manifold through the throttle body opening!

My intake manifold is very gross. I'd love to take it off and soak it in kerosene for a week and then scrub it out with an old toothbrush or something. Unfortunately I am afraid to loosen and tighten bolts on my aluminum engine again after my last screw-up - changing the valve cover gasket set me back $440 as three of the bolts popped.

Is there some sort of chemical that we can spray into the throttle body to clean out the intake manifold? Or is this one of those things that we should not worry about?

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Old 10-05-2001, 02:53 AM   #7
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Thanks for the replies folks. If I remember correctly about the intake manifold, carbon and oil residue is a normal phenomenon, and as long as the PCV valve is not letting too much oil by, nothing to worry about. I'd imagine if your intake valves got bad enough, you'd notice a drop in mileage. You can clean it somewhat by shooting carb cleaner through the throttle body, but remember that anything that washes off is going through the intake valves, into the combustion chamber, and out through the catalytic converter.

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