Miata Mailing List: October 1993, Message #220
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   From: Stan Whitney <71763.644@CompuServe.COM>
Subject: Idle problem
   Date: Fri, 22 Oct 1993 16:58:20 -0400

    The same thing happens to my Escort (protege engine 
w/mazda/Bosch computer).
You're on the right track adjusting the base idle (with terminal 
ten grounded in the diagnostic box, I think, look at the hood 
sticker).
    The computer does it's best to hold the idle speed and base
timing at about 700-750rpm/10-12 deg BTDC.   If you have properly set
the idle at a speed different form that, it will, at idle, try to pull it 
down
to that level.  Your /Our problem seems to occur when the idle speed is is
set at more than 100rpm from normal, and in the process of trying to 
regulate the idle, the computer lets it drop WAY low, then pulls it up.
The closer you you set base idle to the spec, the less dramatic the drop 
will
be.  You have to play with the idle speed, and find the sweet spot that 
works
for a minimal fluctuation.
    I tried to set mine at 1000rpm, and the engine would stall if I got off 
the 
gas to clutch it!  Good luck  ;>

Stan Whitney
71763.644@compuserve.com