re. High idle, problem with idle air motor

[Eric Sanborn]

On Sat, Mar 8, 2008 at 6:57 PM, Ben Swann <benswann at verizon.net> wrote:
>  Trouble-shooting for this problem, I surmise, is different than for an engine still
>  running on CIS.  However, I bet the problem is easy to find and resolve.  Just look for
>  a disconnected vacuum line or any air leak after the throttle - or the throttle itself
>  is allowing more air to pass.
>
>  ISV is still suspect.  I'd substitute something to totally block flow in place of the
>  ISV in order to rule it out.
>  :
>  :
>  Now I re-read the post.  Puts me back to suspecting the ISV circuitry and Throttle
>  switch is suspect and I think a re-check of the switch is in order.  Is this a one
>  switch or 2 switch setup?  He may have disconnected the wrong switch.
>
>  Or - the both ISVs are bad.
>
>  Might help to understand the setup better - what ECU, which Idle control system, which
>  ECU used for ignition?
>
>  For ex.  My car uses the MAC-14 for ignitions and MS V2.2 Extra for fuel and has no ISV.
>  That's right, I have had no need to install an ISV since once the engine warms up after
>  a few seconds, idle is rock solid.
>
>  Ben


Ben this is the graphite colored car you saw a number of years ago
when I stopped by your place.  It is running the stock KH ignition
which I forget the name for, and MS V2.2 MSnS-E code for fuel.  It
sounds like your right and I used the stock KH idle control system.
The current owner did try removing the idle motor and plugging the
hole and it idled just below normal RPM.  I imagine he could remove it
entirely and I could talk him through retuning around idle a little to
keep it running the first 30 seconds.

The car has two micro switches (this is the round throttle body)
interfaced through one connector.  Unplugging it does change the RPM
upwards, but it could be that one of the switches is bad.  I will talk
to him about putting meter on the switch connector and see what he
gets.  I seem to recall that it has three pins.  I assume one common
and two switch signals.  I am a little frustrated because I can't find
my 5k Bentley which would make this a whole lot easier.

Thanks for the ideas Ben.   I'll keep you posted.

-Eric



-- 

Eric Sanborn
http://sofadog.net/4ktq/