Re: [DMCForum] Re: Andrew's Idle
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Re: [DMCForum] Re: Andrew's Idle



Okay, today I installed most of Hervey's lovely blue silicone hose kit.  
They really do look nice in the engine bay.  I've saved the three that 
have to connect deep in the guts of the engine for next time I borrow a 
friend's lift.  I could easily see myself getting one of the stock hoses 
off and not being able to get the silicone hose on.

A couple of the old hoses were somewhat nasty, but none seemed to be in 
particularly bad shape.  All the same, I'm glad to have less than 20 year 
old vacuum hoses on the car, and I think the blue silicone dresses up the 
engine bay nicely without being gaudy.

On to my idle...  There's been no change as a result of replacing most of
the vaccum lines.  I realized today that I'd noticed something yesterday,
but failed to say it in my email.  In fact, I said something quite
different without even thinking.  When I first started the engine (both 
yesterday and today), it actually idled very smoothly, which is abnormal 
for this engine when cold.  It was only once warm that it started hunting 
at idle, which again is abnormal for this engine.

Today it was doing exactly the same thing.  Nice and smooth when cold, but
part way through a quick drive around to warm things up, it started
hunting again.  I put it back in the garage and played with the idle a
bit, and found that if I adjust the system so that the idle microswitch is
*not* triggered, I can get a nice smooth idle around 995 rpm.  (Any lower
with the hot cam on this engine and it starts to shake around quite a
bit.)  While I have this nice smooth idle, if I press down on the idle
microswitch, it immediately begins hunting again.

What's the microswitch do besides make the car pass emissions?  I must
admit it's tempting just to force a 995 rpm idle without pressing the
switch, because it's really smooth, and the engine speed doesn't seem to
drop so low that my radio cuts out either.  I could kill two birds with
one stone here, but I know I'd probably just be hiding the real problem,
and perhaps causing some others.

I assume that playing around with this switch is effectively the same as 
disconnecting the idle speed motor, as suggested by Bill.  Correct me if 
I'm wrong here.  I didn't actually disconnect the idle speed motor today, 
and now the engine is starting to cool again, the light is failing, and 
the neighbors are probably tired of hearing this loud exhaust.

What should I play with next?  :)

-andrew


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