[DML] Re: 3 post idle microswitch

["endotex23" <endotex23@xxxxxxxxx>]

I agree with David too. While I believe it's important to learn as
much as you can some people are so technically inept (no offense
intended) they should bite the bullet and pay to have the problem
corrected. If you're going to service your own cars you need to invest
in the basic tools, instruments, and knowledge to do so. It can be a
fine line to walk at times for those just starting out.

By the way, Elvis is right. As much technical writing as I've done I
should know better than to use words like "kill" and "power". If power
to the ECU was killed it would stop the motor at a random position.
Because the Delorean uses a duty controlled rotary valve for ISC this
wouldn't be good. The idle ECU remains powered at all times but if I
had written the idle speed switch supplies an active low input sunked
to ground it would've only confused matters. Sometimes things just
have to be dumbed down and the poster in question didn't even
understand basic switch operation.

Martin, the ECU sets the motor to a default duty value when that input
is brought low. It's the same default value as when the tach input is
lost. One of the ways (there are several but the manual only gives one
as I recall) to test the idle speed loop is to disconnect the switch
when the throttle plates are fully closed and observe a rise in RPM as
Elvis points out. Either that or crack the throttle enough to open the
switch and manually depress it to observe a drop in RPM as the loop
becomes active. You can even do a crude check for unmetered air using
the system. I prefer a more enhanced method than either of those but
the one in the book is good enough for a basic check. 

Greg





 








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