Date: Sat, 3 Oct 1998 18:15:36 EDT
Reply-To: kenneth d lewis <kdlewis@JUNO.COM>
Sender: Vanagon Mailing List <Vanagon@vanagon.com>
From: kenneth d lewis <kdlewis@JUNO.COM>
Subject: Re: idle surge diagnosis?
David;
I would try the idle adjust screw on the throttle body. Make a mark on it
so you know where you started in case you want to set it back.
The Air Bypass Valve is adjustable but nowhere will you find a
procedure. I experimented with it trying to (unsuccessfully) fix high HC
output. I produced a very similar symptom as yours. If you get the idle
correct with the second ABP you could try to fix the first one. To access
the adjustment unplug the electrical connector and remove a 2mm allen set
screw from the center. Now reconnect the plug and pull back the rubber
boot. The adjustment is accessible, while the engine is running, with a
2.5mm allen between the two wires. Turn the allen CCW to raise the idle,
CW to lower. There is a very small "window" of adjustment.
Let me know if you come up with a logical procedure for
calibrating it.
Drive Safely & Good Luck
Ken Lewis<Kernersville,NC>86 VW crewcab;60 T-5 Coupe
On Fri, 2 Oct 1998 17:53:58 -0700 DAVID MOST <most@UCLA.EDU> writes:
>Hi. My '87 has had a problem during the last year in which it usually
>won't idle at all until it's a bit warm. Once the engine is warm
>though,
>it usually idles, and the idle is smooth. The engine always runs well
>otherwise.
>
>I had the opportunity to try switching a couple of parts from an '86
>recently, and now I have a new problem. I exchanged the idle
>stabilizer
>control unit (behind the tail light), and nothing changed, so I put
>the
>original back in. Then, I exchanged the idle stabilizer valve itself.
>Now, it idles when cold, but after driving even a little, I notice the
>idle speed going up and down in a regular fashion every couple of
>seconds. It doesn't go up a lot, but it's noticeable and new. This is
>all with the AC off. When the AC is turned on, the idle speed comes
>up a
>bit, and there seems to be less fluctuation though I still notice a
>tiny bit of the up and down.
>
>So, I seem to have created one problem while solving another, but I
>suspect that they are related. I know the surging idle issue has been
>discussed before, but I didn't pay close attention to the discussion.
>In
>addition, i'm not sure if what I'm describing is surging. The speed
>goes
>up and down, but it's actually a little hard to hear while sitting in
>the
>front seat with all the windows closed. Some people have described a
>kind of surging with much greater variation in engine speed.
>
>Anyway, I'd appreciate any thoughts any of you may have on this. It
>seems to me that either the idle stabilizer valve from the '86 has a
>different problem than my old one and/or another component (perhaps
>the
>idle stabilizer control unit) of mine isn't working properly either.
>
>Thanks,
>david
>
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