[T3] Weird Idle Problem

[Jim Adney]

On 2 Jul 2012 at 23:09, R. David wrote:

> Sounds like you ~may~ have an air leak into your IAD. One possibility is
> your AAR. It is supposed to allow enough air into the IAD to slightly
> increase the idle on a cold engine, then when it warms up it cuts off this
> extra air so that the idle is set by the idle speed screw. So when the
> engine is cold; you should feel a suction on the AAR intake hose that comes
> from air cleaner, and when it's warm there should be very little suction on
> this hose (or none at all).

The AAR never shuts off completely, so putting your finger over it 
and feeling for suction doesn't tell the truth. The correct test is 
to cover the opening with a warm engine and note whether the idle 
drops or not. It should not.

-- 
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Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA
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