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> > |
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