Date: Sat, 26 Sep 2020 18:46:51 -0700
Reply-To: S DaRoota <sdaroota@GMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: S DaRoota <sdaroota@GMAIL.COM>
Subject: Re: '81 air-cooled engine stall (increase idle speed)
In-Reply-To: <CAMfb+V8-7gKuCT71A_cP+nxKcsW0=1VSo8ncOUazXFDKV90Epg@mail.gmail.com>
Content-Type: text/plain; charset="UTF-8"
2.0 ltr air cooled
L-jet fuel injection if stock.
;)
On Sat., Sep. 26, 2020, 6:36 p.m. al sinclair, <alvanagon@gmail.com> wrote:
> thanks Alex
> > What engine management do you have?
>
> I'm absurdly ignorant, will go to learn how to find out whether it's
> Digifant or whatever and report back.
> I will check vacuum lines as both you and S DaRoota suggest
>
> Alan
>
>
>
> On Wed, Sep 23, 2020 at 1:54 PM <alex@mevay.org> wrote:
>
> > Hi Alan,
> >
> > What engine management do you have? Is it Digifant II?
> >
> > I've been trying to solve a similar or identical issue in my van
> > (hesitation/misfire on abrupt throttle application). Apparently
> > vacuum lines or other unmetered air leaks are a common cause. I've
> > been through that, all the usual tuneup stuff, swapping AFM's,
> > DigiFAST chip, all without much improvement. My next idea is that
> > maybe it's a fuel supply issue. Clogged fuel filter, worn pump,
> > sticking pressure regulator, etc. that allows the fuel pressure to
> > drop too much or for too long on initial acceleration, leading to a
> > lean misfire. I'll post if I get to the bottom of it, but I'm also
> > interested in other suggestions on this issue.
> >
> > Alex
> >
> >
> >
> >
> >
> > On Wed, Sep 23, 2020 at 4:17 PM al sinclair <alvanagon@gmail.com> wrote:
> > >
> > > Our '81 Vanagon (automatic transmission) tends to stall on accelerating
> > > from idle, e.g moving off after sitting at a stop light. It's fine if I
> > > keep the idle speed up a little with my foot on the accelerator. And
> > while
> > > moving there's a hesitation for well over a second when pressing the
> > > accelerator after coasting before engine power kicks in - likely the
> same
> > > issue.
> > >
> > > Is there another way to increase the idle speed besides turning the
> "idle
> > > speed adjusting screw" (Bentley page 24.23)? turning that makes no
> > > difference to the idle speed. I realize that's not addressing the
> actual
> > > problem (of course it would be better to solve it) but increased idle
> > speed
> > > would avoid the stalls.
> > >
> > > Any clues to solving the underlying issue would be great too, but I
> need
> > to
> > > eliminate the stalls so my wife can drive the car.
> > >
> > > This is a different issue, because it's happened for years and the
> stall
> > > issue is new, but noting it in case it's relevant: at speed if the
> > > accelerator is pushed to the floor the engine hesitates, and only picks
> > up
> > > if I back off the throttle.
> > >
> > > thanks
> > > Alan
> >
>
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