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Subject:Re: Idle Control System Explanation, please?
From:David Beierl
Date:Sat, 14 Mar 2015 15:44:57 -0400

At 08:51 PM 3/13/2015, Kevin Duvernay wrote:
>Anyways, Ill save those questions till after i get the new throttle body
>and switch in, mostly curious about the module and valve effects on idle
>(or lack there of??) Is it possible that my finicky throttle switch is
>somehow not alowing the idle contol module to work as/when it should?

First point is the idle control system can't lower the idle, only
raise it.  So the basic idle has to be set down to spec, and with a
worn throttle body that may be impossible without adding material to
the end of the idle adjust plug that obtrudes into the bore at the
thottle plate and closes off the corner where the throttle plate is clipped.

Second, on the 2.1l the closed-throttle switch has to be behaving
properly (and on a worn TB the adjustment changes with the motor
running as the throttle plate shaft shift sideways) for the idle
system to behave properly.

Yours,
David
ps - this isn't a Vanagon-only weird system, they used the same
system on (at least) Jettas for years.  The valve is the same, not
sure whether the control module is.

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