I guess the way I stated it is misleading. But if you have a strong
engine you will experience it yourself.

Vanagon's idle can be set to within 900 - 1000 RPM or even faster.
People tend to set it a little slower toward 900 rather than toward
1000, including myself. Whenever I did that the engine would perform
poorly. I had to go back and turn the idle adjustment screw CCW half
a turn. It would be like give a kick to the engine and you would feel
a significant jump in acceleration.

So you are right, it is not because turning up the adjustment screw
gives it more power. It is only to set it to what it should be. Idle
setting has an implication to engine gas mileage. But engine performance
will suffer if the idle was set to too low. I made the mistake all the time.
Had to force myself to turn that screw back up a bit.

David

--- Mike S <mikes@FLATSURFACE.COM> wrote:

> At 01:15 AM 8/21/2007, David Kao wrote...
> >Try to turn the idle adjustment screw CCW half a turn to one or two
> >turns. This should make some improvement for the idle. If the idle
> >becomes
> >too fast then turn it back half a turn. Usually this will improve
> >horse power quite a bit.
>
> I've seen this claim a few times. Why would that be the case?
>
> Isn't the idle screw simply an air bypass in the throttle body? How
> does changing the small amount of air which is allowed to bypass a
> closed throttle plate have any significant effect on the amount of air
> which flows when the throttle is fully open?
>

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