I have recently solved a problem with surging when I changed the injectors
to ones that were spraying, atomizing properly.  The idle came back to
normal and stayed normal at every temperature.
Zoltan

----- Original Message -----
From: "Dennis Haynes" <d23haynes57@HOTMAIL.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Wednesday, May 23, 2012 9:38 PM
Subject: Re: 86 Syncro 2.1 surging at 2K rpm no load

> Test the throttle  switch electrically. Make sure it is open with the
> throttle open. Also test the circuitry. You should see ~ 5 volts across
> the
> switch when it is open. Can also be a bad distributor hall sensor.
>
> Dennis
>
> -----Original Message-----
> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
> Daryl Christensen
> Sent: Wednesday, May 23, 2012 11:20 PM
> To: vanagon@GERRY.VANAGON.COM
> Subject: 86 Syncro 2.1 surging at 2K rpm no load
>
> Ok..Here is one I have never seen before..Dennis ? Mark ?
> Hold throttle at about 2000 rpm  ( out of gear) and it cuts out and drops
> to
> about idle and then back up to 2k and drops again, etc..
> Will rev higher if you open throttle quickly and get it above 3k or so.
> Idles fine.
> Driving it is much better under load, BUT when shifting mostly between 3rd
> and 4th,   it cuts out during shifting as it goes thru about 2K and feels
> like it slams the tranny up against the body..And yes, its mounts are
> fine..
> If you feather the clutch it will not slam so badly, so its rpm sensitive
> more than load sensitive.
> Cruising on the road its fine till you shift again. So, it seems to be
> mostly rpm related.
> Distributor harness feels OK. AFM traces look great. Can hear the throttle
> switch click.
> Grounds are tight (not cleaned them yet) I am thinking distributor as it
> feels like either the fuel is cutting off or its losing spark for a bit.
>
> Daryl of AA Transaxle
> 425-788-4070
> "On the cutting edge of Old technology"
> 86 Syncro Westy w/Turbo Zetec in the trunk
> 90 Doka Tristar w/2.5 Subie
>