Re: [DML] Re: Yet another Idle question
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Re: [DML] Re: Yet another Idle question

Just to clarify: Elvis, the idle microswitch might be activated at idle 
but has nothing to do with the idlespeed system. All it does is activate 
the vacuum advance as soon as you come off "idle". The idle races due to 
over-advance on the ignition if the switch isn't pressed.

It sounds to me as though the infamous "brass screws" have been twiddled 
to let the engine idle correctly when cold, and it speeds up as it warms 
up, which is to be expected.


Are your brass screws seated all the way in?

With the ignition on, engine off, does the idlespeed motor (black thing 
with black plug on the left of the engine) hum?

The only problems I've seen related to the idlespeed thermistor are when 
it becomes unplugged or has a poor connection - this makes the idle race 
to 2000rpm so I doubt it's the problem. It sounds to me more like a 
stuck idlespeed motor (you can usually resurrect them with some 
penetrating oil, and a bit of enthusiastic cleaning) or an electrical 
problem on the idlespeed governor. I've seen a fairly consistent rate of 
governor failures.

To answer your Q directly, yes the thermistor is across 9 and 11


Elvis wrote:

> Bill,
> don't make it so complicated.
> 1. is the idle switch ok ?
> 2. is the idle switch being pushed correctly ?
> 3. verify it again
> 4. when the idle still hangs and you tested the switch
> with the engine off - test it again with the engine running !
> (push the lever it to close the butterflies completely)
> The vacuum behind the butterflies may prevent them from closing
> completely because the shaft is worn.
> I've seen and heared of this problem more often then I heared
> of a defect temp sensor (actually not even once !).
> When the idle switch is not pushed, the idle ECU increases
> idle speed to something above 1000rpm !!!!
> Elvis & 6548

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