Date: Tue, 21 Aug 2007 09:03:02 -0700
Reply-To: David Kao <dtkao0205@YAHOO.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: David Kao <dtkao0205@YAHOO.COM>
Subject: Re: Rough running till warmed up
In-Reply-To: <288007.5513.qm@web52101.mail.re2.yahoo.com>
Content-Type: text/plain; charset=iso-8859-1
Dylan, thanks for sharing your experience in setting idle for your Vanagons.
I have two Vanagons, a 83.5 and a 84. I think they have an older injection
system than yours. If I set mine to 900 for idle they would perform poorly.
I don't mean very poor but they will do better clearly if I set them to around
950 - 1000. I believe it is dangerous to set idle too slowly. The engine may
overheat, especially if AC is on, in stop and go traffic jam situations.
David
--- dylan friedman <insyncro@YAHOO.COM> wrote:
> 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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