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Date:         Tue, 21 Aug 2007 08:39:22 -0700
Reply-To:     dylan friedman <insyncro@YAHOO.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         dylan friedman <insyncro@YAHOO.COM>
Subject:      Re: Rough running till warmed up
Comments: To: David Kao <dtkao0205@YAHOO.COM>
In-Reply-To:  <67634.13052.qm@web82715.mail.mud.yahoo.com>
Content-Type: text/plain; charset=iso-8859-1

I set idle by ear now. I agree with the range, but find each van to be a little bit different. My Carat would idle just below 900 and was smooth as silk. My 91 Syncros idle above that closer to 1000+, both just as smooth, just higher revs. I tried getting them all to the same rpm while they were sitting next to each other, but something would not be right in each case. Go with what works and the numbers are just a baseline to start from.

dylan

David Kao <dtkao0205@YAHOO.COM> wrote: 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 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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