Matthew;

I can say absolutely, with out doubt, maybe.  When I tried unplugging my O2 sensor the other morning my '85 did something like that.  Before I did the O2 experiment I had noticed that the RPMs would surge when I was coasting to a stop -- take my foot off the pedal and the RPMs drop to about 1K then jump up to about 1500 before droping back down.  I believe both of these events can be attributed to an improperly adjusted throttle switch -- I brain-farted and set it at .02" instead of .002".  I reset to .002" and haven't had a repeat (also plugged the O2 back in).  I am getting somewhat intermittent throttle switch activity though -- it doesn't always kick in when I take my foot off the pedal (I can 'slap' the pedal real quick and get it going).  When I have time I'm going to give the whole throttle body a Gumout bath. If that doesn't work I'll set it to max gap -- .004"/.1mm -- because I may be dealing with a worn switch.  If that doesn't do the trick I'll break down and instal!
l the new switch I've been putti
ng off for a year.

Chuck

In a message dated Fri, 9 Mar 2001  1:53:05 PM Eastern Standard Time, Matthew Pollard <poll7356@uidaho.edu> writes:

<< Chuck, i gotta quick question about the throttle switch and stuff. I've
check mine to make sure they are turning off and on athe right time (wide
open and just as you touch the throttle cable) but would a bad switch
cause surging? Here is the deal, if i step on teh gas and bring the rpms
to 2000, after a minute it heads to 3000 and then back to 2000 after 15
seconds. Any ideas?
thanks
matthew
84

Matthew Pollard             http://www.uidaho.edu/~poll7356
Dept. of Chemistry               http://www.chem.uidaho.edu
University of Idaho                   http://www.uidaho.edu

On Fri, 9 Mar 2001, Chuck Mathis wrote:

> We're talking about the same thing in different units (.05mm = .00197").  I'm still using te same primative feeler guage I've had in my tool box for years.  May go fully metric here soon.
>
> Chuck
>
> In a message dated Fri, 9 Mar 2001 11:33:07 AM Eastern Standard Time, Todd Last <Rubatoguy@mindspring.com> writes:
>
> << I'll have to recheck my Bently, but I thought the range was from .05 to .1 mm for
> my '88.
>
> Todd
>
> CMathis227@aol.com wrote:
>
> > In a message dated 3/8/01 11:54:29 PM, Rubatoguy@MINDSPRING.COM writes:
> >
> > << Is it better to have the throttle switch adjusted to the smaller or
> > larger range of the allowed adjustment? >>
> >
> > The range is not that great -- only 0.002" to 0.004".  With older units it
> > can be hard to get it to work at a specific point so just working is good.
> > Outside the range varies from not-good to bad.  You could play around with it
> > some and see if it really makes a difference if it works at 0.002 or 0.003 or
> > 0.004.
> >
> > Chuck
> > '85 Wolfsburg Westy -- 'Roland'
>
>  >>
>

 >>