Idle Switch Question

[Brian Devlin]

The switch is simply an on-off switch, and the adjustment just
changes the point where it switches. 3.5 ohm does seem a bit high,
though. If the power for the ISV is going through this switch, then
it would be severly reduced. If the switch is just sending signal to
a relay or transistor, I would think that it would work.
The thing to do is to jumper the circuit (make it 0 ohms) and see
whether that causes a correct idle.
-Brian

>I've been troubleshooting a high idle problem on my 1988 5KSQ (CIS-E III)
>for what seems to be ages now.  Just came in after an afternoon out in the
>driveway with the multimeter and the Bentley.  Some questions wrt checking
>the idle switch (Bentley pp 25.106 and 107).  I suspect this switch, but my
>test results don't follow the Bentley.
>
>No matter how I adjust the idle switch, I get 3.5 ohms between terminals 1
>and 2 with the throttle fully closed.  The Bentley calls for zero ohms.
>Once the throttle moves a wee bit, the resistance changes to infinity
>(open).  This latter measurement is in agreement with the Bentley.  My
>problem is with the value I get with the throttle closed.  The Bentley
>states that the fix is to adjust the switch.  The position of the switch can
>be adjusted in its bracket.  But no matter how I adjust it, I still get 3.5
>ohms.  I tried at the extremes of its adjustments - still 3.5 ohms.  Note
>that the Bentley doesn't say to replace the switch.  The fix given is to
>adjust the switch.  BTW the full throttle switch portion checks out OK.
>What am I missing here?
>
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