Thanks Dan.
AFM should be ok but will recheck voltage drop outs.

On 4/11/15, Dan N <dn92610@gmail.com> wrote:
> the bogging down symptom could be dead spot on your AFM
>
> On Sat, Apr 11, 2015 at 2:43 PM, Neil N <musomuso@gmail.com> wrote:
>
>> Hi all.
>>
>> This is for an '88 2.1 WBX with Digifant. The idle stabilization valve
>> and control unit are currently unplugged. (see below).
>>
>> However. If: engine systems are working correctly, IS system is
>> connected, no other loads are on engine (AC, PS, heater etc.), when
>> accelerating from a dead stop, does the throttle switch act as an
>> input?  i.e. if that input were missing, would this cause an
>> occasional bog when accelerating from a dead stop?
>>
>> I would think it doesn't make any difference given that the IS system
>> should only affect the engine at idle, but then I have to wonder if
>> there's a transition of sorts that happens when accelerating from a
>> dead stop. i.e. at idle, air that is bypassed into intake plenum via
>> ISV is closed off as the throttle opens. (throttle switch input?)
>>
>> Regardless if engine off (ign. on) or "1" wire connected or not,
>> engine running, the valve draws far less than the ~ 420 mA spec. Like
>> around 130 mA VAC. The valve buzzes and I can blow air through it when
>> it's operating. The engine runs ok otherwise but has the occasional
>> minor bog accelerating from a dead stop. The worst bog so far, was
>> during a trip in Harrison Lake area here in BC. While traveling back
>> out of camp, we pulled over on a hill. When I went to accelerate from
>> dead stop up the hill, the van took some time before accelerating.
>> Accelerator pedal about 1/2 down made no difference. In a second or
>> two, the engine "caught up" and accelerated. I can't see how the idle
>> stabilization valve would figure into this though.
>>
>> FWIW, my local parts guy pointed me towards the Audi 5000 as a
>> possible parts source for a used valve. I'll search more on this, but
>> found this page interesting:
>>
>>
>> http://vnc.thewpp.ca/stuff/bentley/ep0niks.ctech.ca/vw/eva2/FU01/ch6.3.2.html
>>
>> Via a linked page there, I see mention of 2 and 3 pin valves. I don't
>> know if all 2.1 WBX digifant engines have this, but the ISV connector
>> on my '88 has a 3 pin housing with only 2 pins being used.
>>
>> I would think a CIS-E ISV is harder to find than the Vanagon part but
>> it may suffice?
>>
>> Neil.
>>
>>
>> --
>> Neil n
>>
>> Blog: Vanagons, Westfalia, general <http://tubaneil.blogspot.ca>
>>
>> 1988 Westy Images <https://picasaweb.google.com/musomuso/New1988Westy>
>>
>> 1981 Westfalia "Jaco" Images, technical
>> <http://tubaneil.googlepages.com/>
>>
>> Vanagon-Bus VAG Gas Engine Swap Group <http://tinyurl.com/khalbay>
>>
>

--
Neil n

Blog: Vanagons, Westfalia, general <http://tubaneil.blogspot.ca>

1988 Westy Images <https://picasaweb.google.com/musomuso/New1988Westy>

1981 Westfalia "Jaco" Images, technical <http://tubaneil.googlepages.com/>

Vanagon-Bus VAG Gas Engine Swap Group <http://tinyurl.com/khalbay>