I don't have my Bentley here so I don't know the page numbers... but there are tests for this in there...

Bill
  ----- Original Message ----- 
  From: William S. Brown Jr. 
  To: vanagon@GERRY.VANAGON.COM 
  Sent: Thursday, September 21, 2000 7:30 PM
  Subject: 86-Idle Stabilization Question

  How can I determine if an idle problem is the idle stabilizer control unit, or the idle stabilization control valve?  With both plugged in I get about 2000 RPM, so I just unplug them and set the idle at about 1100.

[text/html]