Johan,

The idle position of the throttle is controlled by a screw that is set at
the factory. You should never have to adjust this screw as the idle speed is
controlled by another screw (a big one on top of the throttle body) that
controls how much air bypasses the throttle.

The idle position switch is supposed to be set such that it closes when the
throttle is in the idle position. This signals the ECU that the engine is
idleing and the ECU makes the necessary adjustments in timing, mixture, etc.
to allow the engine to idle properly. If this switch is not properly
adjusted or if it is broken, you could experience the symptoms you
described. It is easy to check that the switch closes properly at idle with
an ohmmeter.

MM

>From: Johan Nyberg <johan.nyberg@ABC.SE>
>Reply-To: Johan Nyberg <johan.nyberg@ABC.SE>
>To: vanagon@GERRY.VANAGON.COM
>Subject: Throttle adjustments help wanted
>Date: Thu, 13 May 1999 17:39:09 +0100
>
>Hello List.
>
>I'd like some tips on the two settings on the FI throttle body.
>
>1. The idle position of the throttle, and its relation to:
>2. The idle position switch.
>
>I have serious bucking/ jumping when coasting at very low rpms. Any ideas
>welcome.
>
>
>   ************************************************************
>     Johan Nyberg, Sweden N 59o E 17o 25"
>    '86 Caravelle C
>     1Co 13:12
>   ************************************************************
>
>

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