Date:         Mon, 15 Jul 2019 20:29:25 -0700
Reply-To:     Don Hanson <dhanson928@GMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Don Hanson <dhanson928@GMAIL.COM>
Subject:      Re: Throttle-on running issue
Comments: To: Chris S <szpejankowski@gmail.com>
In-Reply-To:  <E0DE9A62-94D0-409E-9FB2-631BFB450B5D@gmail.com>
Content-Type: text/plain; charset="UTF-8"

Open the gas cap and run some compressed air back from the fuel line
outlet, too.

And carefully listen as you release that fuel cap after one of the episodes
of stumbling.. could be tank venting probs...those are all pretty
sketchy..(If you're talking about Julian's van)

  But my bet is that Icm that piggy backs on the "brain"

On Mon, Jul 15, 2019, 6:07 PM Chris S <szpejankowski@gmail.com> wrote:

> I searched first and could not find.
>
> We have a 2.0 ABA with 1.8 head with Digifant II FI.
>
> The engine will start fine from cold.  As it warms up it will stumble on
> throttle.  Press throttle open - Baaaaaaaaah - nothing.  Lift throttle,
> returns to idle, sputters a bit like it’s missing, but then continues to
> idle fine at normal speed.  Crack throttle open gradually and it may catch
> the first time, but then baaaaah, until you lift.  The hotter the engine,
> the worse it is.
>
> I’ve found no vacuum leaks in intake.  Unplugging O2 sensor makes no
> difference ( a new sensor is on the way just in case).  Unplugging Temp
> sensor only raises idle slightly, but no difference.  I changed fuel pump
> and fuel filter with my new spares, no difference.  I swapped AFM, no
> difference. Spark Plugs are recent.
>
> My son mentioned some stumbling issues when it was raining hard, and
> current issue appeared after he filled up with gas.  I added gas dryer, but
> no difference.
>
> Ideas?
>
> Chris in atnaltA.
>