Thanks, everyone.

   My switch does click as I open the throttle, but perhaps it isn't
*exactly* right...The engine behaves like it is not running at all,
sometimes, when you re-apply the accelerator, until a second or two passes
and by then I've further depressed the pedal and all of a sudden, it jumps
ahead....well....it "jumps" for a Volkswagen Van, anyhow....maybe a slight
lurch forward....as the engine 'catches' after coasting.....   So perhaps
my throttle switch is adjusted with a bit too much play between full off
throttle and when it re-opens...I  shall move it around till the switch is
tighter....opens sooner?...not saying that just right, am I?
   After the helpful explanations, I think that might be my problem...

On Sun, Mar 10, 2013 at 2:18 PM, Robert Keezer <warmerwagen@yahoo.com>wrote:

>
> Don, as you may know, the throttle switch , actually 2 switches, is called
> the wide-open throttle switch  and the idle switch .
> Wide -open tells the ECU the throttle is fully open and idle tells it that
> it's closed.
>
> When going down hill at road speeds, your foot is off the gas on steep
> hills and the injectors are off until. engine rpm drops to about 1200 rpm.
>
> That means that the engine is not running during this time
> The pop may be from a leaky injector not fully closing and leaking gas .
>
> Just like the WBX engine, the throttle switches need to be checked for
> adjustment periodically.
>
> Should read zero Ohms at closed throttle, infinite ohms as the throttle
> opens, and zero Ohms again at full throttle.
>
> You should hear a click just as you open the throttle. You adjust by
> moving he switch forward or back on the plate after loosening the set screw.
>
> Robert
> 1982 Westfalia
>
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> --- On *Sun, 3/10/13, Don Hanson <dhanson928@GMAIL.COM>* wrote:
>
>
> From: Don Hanson <dhanson928@GMAIL.COM>
> Subject: Throttle stop switch? Stumbles on resume throttle..
> To: vanagon@GERRY.VANAGON.COM
> Date: Sunday, March 10, 2013, 6:44 AM
>
>    I have a Digifant ignition on a 93 Jetta inline gas powered van..   When
> I coast down a long grade at higher RPMs (highway speeds) there is often a
> slight hesitation as I resume pushing on the gas pedal...This hesitation
> can be more pronounced at high altitude, I think.  Recently, at over 8000'
> elevation I felt an almost "engine off" delay of perhaps a full second when
> I reached the bottom of a slope and put my foot back on the pedal.    If I
> keep a very slight amount of throttle open, there is no hesitation.
> Another diagnostic symptom (could be exacerbated by a small crack in my
> exhaust downpipe) is that rarely, my exhaust will "Pop!" loudly a single
> time when I drop throttle at lower rpms.   This 'delayed throttle response'
> was particularly un-nerving as I was descending a very slick and windy
> snow-covered pass recently..."exciting moments" as the engine resumed drive
> after descending slowly in a lower gear...
>
>    I have a switch that looks somewhat  thin and flat, with a
> leaf-spring/bent lever looking prong that is activated by a small post in
> the linkage near my throttle body.  I assume that is the throttle stop
> switch.   It seems to activate (mechanically) properly...it "click" when
> you just crack the throttle and 're-clicks' when you release the
> throttle...
>   I can't decipher my 2 Bentlys (Vanagon and Cabriolet) well enough to even
> figure out which switch I have and how to go about testing it.   There
> seems to be a couple of very different ones used on various Digifant
> systems.   Can someone guide me as to how to test this part?   Does anyone
> have any other ideas as to what might be causing this somewhat troublesome
> delayed throttle response?
>
>   Don Hanson
>
>