Idle Stabizer Valve

Bernie Benz b.benz at
Mon Feb 13 14:01:52 EST 2006

Never had trouble with mine but, as I recall the default position of this
Bosch rotary valve is partly, 1/8th open.


> From: "Derek Pulvino" <dbpulvino at>
> Date: Mon, 13 Feb 2006 09:53:53 -0800
> To: pjrose at
> Cc: 200q20v at
> Subject: Re: Idle Stabizer Valve
> Phil,
> I knew about the carb-cleaner trick, but never seen one of those quite so
> frozen up, especially while showing so little sign of moveability (is that a
> word?).  Before dropping more money, I'll try the carb clener trick.  Easy
> and cheap.
> As the flapper was partially open, I did use a the flat side of a flat-head
> scewdriver to try and wedge it open, but I remembered how persnickity those
> things are so didn't force it so much that I would wind up damaging the
> metal.
> Derek P
>>> For curiosity, took off the valve today to see if it was gunked up and
>>> while
>>> I didn't see too much crud inside the valve, I couln't move the
>>> flapper/door/valve.  The valve was stuck about 1/8 to 1/4-inch open.
>>> These seems odd to me that it would freeze up like that.  Anybody with
>>> ideas?
>> If you have hopes of resurrecting the valve, be sure to avoid using
>> anything that's metallic/hard (like the tip of a screwdriver) if trying to
>> manually move the valve "shutter".  Use something that's relatively soft,
>> like a piece of soft wood (wooden pencil?) to avoid damaging the shutter's
>> fragile knife-edge. Spray some carb cleaner to free up the valve (assuming
>> gunk is the problem) and then test electrical operation using a 9-volt
>> battery.  R&R is discussed in the Bentley manual.
>> Phil
>> --
>> Phil Rose
>> Rochester, NY
>> mailto:pjrose at
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