Warm engine idle fluctuation

[WAUFX at aol.com]

i have seen this funny little quirk on my and a friend's 90q, 88 and 89 model
years.

in both cases, the shorter of the two ISV hoses had split and collapsed on
itself.
now, i haven't a clue as to why exactly this causes the idle to go bonkers,
but
replacing that approx. 6" hose solved the problem in both cases.

hope this helps ya..

megan

Phil Payne wrote:

  > > My 1988 90Q idle is about 1200 RPM when fully warmed up. It then
  starts to
  > > fluctuate between 1220 and 750 every two seconds. It only remains
  at 750 for
  > > an instant. I've changed the idle stabilization valve and squirted
  WD40
  > > around vacuum lines with no success. I have been told this could
  be the O2
  > > sensor or air control potentiometer.




--

Megan Bigelow

http://www.uvm.edu/~mkbigelo