Warm running CIS problem - Update

[mr_bubblehead74 at yahoo.com (Mad Matt)]

Only problem with that theory is that the Thermo-time
switch only gets voltage when the starter is
activated, to fire the Cold-start injector.



--- Cory Langford <Cory_Langford@bcit.ca> wrote:

> Was mulling over the problem last night and had an
> interesting thought.
> 
> It seems that the car tends to start having issues
> when the term. time 
> switch cuts out, and seems to run better when the
> switch cuts in.
> 
> I thought this very odd as I have unplugged the cold
> start injector as a 
> simple test to see if it was causing issues. 
> 
> So this morning I watched it closely, and it seems
> to be dead on.  It 
> looks like at the point the term switch kicks in the
> car runs well. It 
> does so for about 3 minutes after the point where
> the switch should kick 
> out. 
> 
> So how long does the term switch stay active after
> it reaches temp?  About 
> 3 minutes?
> 
> One other thing I noticed this morning (paying a bit
> closer attention 
> now), was that when the water temp was at the point
> where the term. time 
> switch should be cutting out the voltage drops from
> just over 13V to about 
> 12.5V.  As time goes by (or temp rises) the car runs
> worse.  When it 
> starts to have the idle rolling issue the interior
> volt meter is running 
> at about 12V-11.5V.  When the rad fan kicks in I
> notices the voltage drops 
> to 11V.
> 
> My latest theory - the term. time switch is actually
> shorting the +12v 
> connection it has to the block when it heats up.
> 
> I am thinking this would result in a slow loss of
> voltage to the coil, and 
> hence the slowly degrading performance.  It would
> also explain the a/f 
> meter starting to read strange as the block is the
> ground for the o2 
> sensor, and if we feed a constant voltage to it the
> o2 transferring that 
> voltage back through the sensor to the gauge and
> thus I get the -ve 
> 0.4-1.1V readings on the sensor wire (instead of the
> +.5v range).
> 
> Anyone have a bad term. switch short?
> 
> I guess that is my next step.  Grab another one from
> the bone yard to see 
> if it changes anything.
> 
> Sound plausible?
> 
> 
> Cory Langford
> '86 Roc turbo, 
> '78 Roc turbo - Daily driver project,
> '65 Ghia Coupe
> 95 Eurovan, etc, etc... :)
> 
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> 


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