Quote:
Originally Posted by ChevLoRay
So, it sounds like you had drivability issues in addition to temperature issues. The CPU's in these vehicles, especially the OBDII (1996 and up), are much more dependent on data from sensors than something that is old-school, like my '69 C-10.
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Indeed. It's called the Closed Loop and Open Loop, and deals with your O2 sensors. When you first start your engine, it's cold, and your O2 sensors go into the closed loop, yadda yadda, as it warms up, it goes into the open loop, changing some things around. It's been a few years since I've been taught about it though, so I can't remember everything what it does. That's the jist of it though; open loop, closed loop. Matters on emissions and general operations of the engine, like what sleoard13 was saying.