o.k. - another reason this list rocks - got the switch adjusted correctly -
thanks to shooftie's blog for the pics of the throttle body (
http://shufti.wordpress.com/).  Remains to be seen if this is the cause of
the revving problem at idle with a warm engine.  I can see why you'd want to
replace this switching system.  I took off the throttle body off (pretty
easy job - esp. if you're patient with penetrating on the bolts/nuts) - it
was hard to adjust at first, but once I took the bolt out that holds the
switch in place - cleaned it - cleaned the switch as much as I could - I
could fiddle with it enough to get it to work (within specs).

Whohooo - throttle body fun indeed!

On Thu, Jul 8, 2010 at 9:02 PM, Mark <mbrush@gmail.com> wrote:

> Thanks for all the suggestions - not sure, but I think I found a problem
> with my throttle valve switch.  I followed the test on page 24.59 of the
> Bentley "Throttle valve switch, checking and adjusting."
>
> I get continuity when I start the test, at idle.  Continuity breaks when I
> open the throttle (continuity good at full throttle), but then when I do as
> the manual says and "close [the throttle] slowly" - I get no continuity at
> idle again.  I can only get continuity again when I open throttle and let it
> snap back into place.
>
> Seems to explain my symptoms since it says "warm engine will have NO fuel
> deceleration shut-off or DLS function at idle" if gap is too small....
>
> but I can't get any continuity when I "slowly" bring back into place
>
> So what now?  How do I fix this?  Is it just a matter of adjusting the
> throttle valve?  Why does it get continuity when it snaps back into place,
> but not when I slowly bring it back?
>
> On Wed, Jul 7, 2010 at 11:36 PM, Mark <mbrush@gmail.com> wrote:
>
>> Has anyone had this problem?  After my engine reaches operating temp and
>> is in stop and go traffic, it doesn't fall back down to idle after I
>> accelerate to move forward in traffic.  It just stays revved at 3,000 rpm or
>> thereabouts.  Not fun when stuck in traffic.  I'm thinking it has something
>> to do with the spring on the throttle (maybe needs to be cleaned or
>> greased?).   I haven't worked on this part of the van yet, so I'm not
>> familiar with how the accelerator cable hooks up and works in the engine
>> compartment.
>>
>> Thanks for any insights!
>>
>> Mark
>>
>> --
>> Mark
>> 1990 Westy (2.1 - manual)
>>
>
>
>
> --
> Mark
> 1990 Westy (2.1 - manual)
>

--
Mark
1990 Westy (2.1 - manual)