<BLOCKQUOTE>quote:</font><HR>Originally posted by mark:
it means coolant temperature override.its that funny lookin valve thats screwed into the intake manifold and has vacuum lines attached to it.im pretty sure it retards or advances the timing when the engine temp gets to a certain deg.(someone correct me if im wrong)
It doesn't do this directly; it simply switches between a port or manifold vacuum source. Or for the EGR, it shuts off or permits the vacuum signal to reach the appropriate valve. They also control the thermostatic air-cleaner and the AIR diverter valve in some years.
<BLOCKQUOTE>quote:</font><HR> ive disabled mine a long time ago and im now running an alum edelbrock manifold.i wanted to find a nice plug for the hole but the threads seem unique.
It's a standard NPT fitting; probably a 3/8" size.
<UL TYPE=SQUARE>* '78 Cherokee 4-door
* '88 Grand Wagoneer[/list] http://studentweb.providence.edu/~rbarry/wheels/