I'm gonna guess an FI connector is loose/corroded or a wire to an injector
is broken under the insulation and intermittent.
On Sep 26, 2013 5:02 PM, "Skip" <skiplaubach@comcast.net> wrote:

> Update:  Drove at lunch today and the engine ran beautifully.  Did notice
> when I drove over a rough railroad crossing that the van immediately
> started bucking.
>
> My diagnosis (not validated) is either a fuel pumping interruption (from
> the bumps) or the ECU gets "confused" when jostled over bumps or the AFM
> gets whacky from the bumps.  The ride smoothed out less than 100 yards
> beyond the crossing.
>
> The difference between this morning and lunchtime runnability was
> incredibly large.  I think the fact that runnability is not consistent is a
> data point.
>
> Anyone hazard to provide a root cause?
>
> Skip
>
> ----- Original Message -----
> From: Skip
> To: Vanistas
> Sent: Thu, 26 Sep 2013 15:33:58 -0000 (UTC)
> Subject: Digijet rough/wandering idle and bucking at slower speeds
>
> '84 1.9L (with the 2200cc GW upgrade), digijet WBXR
>
> Just installed the Sorensen fuel injectors (w/new seals) on Sunday.  Made
> in America.  On sale at a FLAPS (local A-Z).  Noticed an improved smooth
> idle and acceleration immediately versus my (recently cleaned OE FI's.  I
> had to fiddle with my idle versus the OE FI's.  The Sorensen FI is a "disk"
> versus the OE, which is a "pistel" type FI.  Some recent chatter on
> thesamba about these.
>
> Then, I drove my Westy to work this morning.
>
> The idle was rough and wandering, in fact the
> engine died a couple of times at stoplights (started right back up,
> fortunately).  Some bucking in 2nd and 3rd gear.  Wondering about a
> vacuum leak, timing, O2 sensor, fuel filter, fuel pump, ECU.  I can put my
> hand on the problem but never my finger...
>
> I'm leaning toward a vacuum leak and more work on idle adjustment.
>
> Ideas?  Thanks.
>
> Skip
>